How To: Install In-Tank Fuel Pump

[GOTZOOM?]

The fuel pump you need is a 94-97 Miata Walbro 255 LPH HP. P/N GSS342


One of these is the stock Miata pump, and the other is the stock Protege pump.
http://www.image-hosting.net/images/messageboard/gotzoom/Protege 023.jpg

Step One: Remove Gas Cap. Flip drivers side rear seat forward.
http://www.image-hosting.net/images/messageboard/gotzoom/Protege 028.jpg

Step Two: Lift flap and remove 4 cover screws.
http://www.image-hosting.net/images/messageboard/gotzoom/Protege 029.jpg

Step Three: Unplug the two plugs.
http://www.image-hosting.net/images/messageboard/gotzoom/Protege 030.jpg

Step Four: You will need to remove this plug that I am holding from its holder that I am pointing to.
http://www.image-hosting.net/images/messageboard/gotzoom/Protege 031.jpg

Step Five: Now remove the Fuel Lines. This is tricky. Just use a small flat tip screw driver to lift each side of the green clip over the lip on the line.
http://www.image-hosting.net/images/messageboard/gotzoom/Protege 032.jpg

[GOTZOOM?]

Step Six: Now remove the 8 screws that hold the unit on the fuel tank. IMPORTANT: Make sure you use a very good #2 screw driver on these screws. They are very tight and soft, and if you are not careful, you will strip them Pull the unit up and out, but not all the way, make sure the screen drains before tracking it across your interior.
http://www.image-hosting.net/images/messageboard/gotzoom/Protege 033.jpg

Step Seven: Unplug the fuel pump! If you dont, you will rip the wires out of the plug. Trust me, it will happen. Now that it is unplugged, remove the white clip and pull the fuel pump out. It will be a little tight getting it out, just pull on it.

Step Eight: Either transfer the the screen to the new pump, or if you bought a new one, put it on the new pump. Do not use the one that comes with the walbro. It mounts in the wrong direction and will not pick up fuel. Remove the rubber sleeve off the old pump if it came out of the hole, and the white spacer and put them on the new pump. If the rubber sleeve isn't on the old pump, make sure it is still up in the fuel line. You dont have to take it out, as long as it is up in there your fine. Its what seal the nipple on the fuel pump going up into the fuel line.

Step Nine: Put the new pump back into the holder and plug it in.

Step Ten: Cut the bottom off of the white clip holder so that you have two clips for each side. I used a Dremel with a cutting disk.
In the picture is the peice you are cutting off.
http://www.image-hosting.net/images/messageboard/gotzoom/Protege 034.jpg

Step Eleven: Put the two clips on and weave a zip tie thru them and around the fuel pump as in the picture. You may have to study these pictures to get it right. If its not done this way, the pump may come loose and fall into the tank while driving, and that wouldn't be good at all. Make sure to take a pair of pliers to pull the zip tie as tight as possible.
http://www.image-hosting.net/images/messageboard/gotzoom/Protege 020.jpg
http://www.image-hosting.net/images/messageboard/gotzoom/Protege 021.jpg
http://www.image-hosting.net/images/messageboard/gotzoom/Protege 022.jpg

Step Twelve: Make sure Fuel Pump is plugged in and reinstall everything. Happy Motoring.

[GOTZOOM?]

Sorry guys, the site that host my pics turned them off for the rest of the day because I went over my bandwidth for the day. Bad Boy...BAD BOY! Check back again later and the pics should work.

[spoolinmp3]

Good Job, just for info I will move this to the HOW too section in a few days;)

[PaulMP3]

good write up, this may come in handy.

[flat_black]

Just out of curiosity, what are the differences in output between the two?

[duMb KeoLa]

how can you tell if theres a difference, do you need a fuel pressure gauge?

[flat_black]

That'd do it just fine.

[dominoy2k1]

damn....what happened to the pics?.....

[GOTZOOM?]

Stupid villiage photo cancelled my account because I was directly linking to download videos. Who do you guys suggest for picture hosting?

[azeli73]

something simple like yahoo should do it. or upload them here ;)

[dominoy2k1]

yeah yahoo....cause i took mine apart but i dont know how to put new one in.....or just upload to the forum...

[GOTZOOM?]

I've tried to upload them here, doesnt seem to work, unless I am doing something wrong. Maybe I will try Yahoo.

[

[dominoy2k1]

hey ummm try yahoo and just name them 1,2,3,4......etc...you can put em in the briefcase...

[dominoy2k1]

ummm...not to rush you or anything...but have you uploaded them yet....

[GOTZOOM?]

I'm working on it brother. Hang tight. I am using datazap, so I got to get used to it.

[GOTZOOM?]

Ok, I finally broke down and decided to purchase some space. I post a lot of pics anyway. Datazap aint worth a shit by the way, it only gives you 1MB. So I am using this other place, its easy to use. Please let me know if you guys can see the pics just to be sure.

[dominoy2k1]

yeah they work now...thanks...

[GOTZOOM?]

dominoy, did you order the kit or just the pump by itsself

[bruce95fmla]

sweet write up ... glad I read this
Bruce

[dominoy2k1]

well it was the pump and miata upgrade or something...thats what it said on the invoice.....

[Moscarsado]

does this work on the msp protege also?

[MarkSpark]

what does this mod do?

[EviLMaN]

yea wat is the point of this mod???

[duMb KeoLa]

if youve got a turboed p5, protege, mp3, our stock pumps cant supply enough gas for high bo0st applications...this allows more fuel to get to the engine...(from what i understand)

higher flowing fuel pumps, more gas, less blown engines

[EviLMaN]

sooo it wont do anything for a N/a protege5?

[twilightprotege]

yep, useless on a NA P5....unless you've got a 240whp NA engine...

[BinaryRotary]

No pics, dead links again.

[GOTZOOM?]

No pics, dead links again.

I can see the pics.(dunno)

[t3ase]

Guys, if you need a place to host pics, PM me. I've got unlimited space on a box.

[stef_nz]

Just as a side note to this great "How-to", I've just put one in my car. It wasn't the miata one, was the rx7 model P/N GSS341 not P/N GSS342.
2nd Gen specifics:-
I didn't need to cut up any pieces to get these things to fit - our pumps are mounted on a metal rail in a kinda bent L shape where the pump sits on the bottom piece of the L. If you simply bend the piece that the pump sits on you can position the pump outlet back in line with the pipe with the only drawback being that you push the electrical connector slightly further into the tank. This allows you to use all the bits that come with the kit without modification...........I hope, my car is still running anyways ;)

ps, nice hum too :D

[instylz]

(peep)

[1FASTMSP]

so which one is it for the MSP, GSS341 or GSS342? i want to make sure before i tear into my car...

[black_rob00]

so which one is it for the MSP, GSS341 or GSS342? i want to make sure before i tear into my car...
I just did the install today. I used the GSS342..

[1FASTMSP]

but you don't have an MSP, i am wondering if there is any difference?

[1FASTMSP]

also, is there any fear of the zip tie disentegrating from the fuel? that would be a very bad mishap...

[t3ase]

but you don't have an MSP, i am wondering if there is any difference?There is no difference. If Mazda's developers had changed our fuel system in our MSPs, we wouldn't have some of the issues that we do.

[1FASTMSP]

i just went to install my pump and the GSS 341 will NOT work. The ends are on opposite sides of the pump, not the same side like the GSS 342, <-----this is the pump you need to use, at least for the MSP. the issue is the way that the screen attaches to the pump, it can only attach one way because of the way that it sits in the pump. someone please make a note of this at the top of this thread before someone else makes this mistake...(hand)

[t3ase]

i just went to install my pump and the GSS 341 will NOT work. The ends are on opposite sides of the pump, not the same side like the GSS 342, <-----this is the pump you need to use, at least for the MSP. the issue is the way that the screen attaches to the pump, it can only attach one way because of the way that it sits in the pump. someone please make a note of this at the top of this thread before someone else makes this mistake...(hand)Errrr... I installed the Miata pump mentioned in the first post today on another MSP. It went in fine.

[t3ase]

i just went to install my pump and the GSS 341 will NOT work. The ends are on opposite sides of the pump, not the same side like the GSS 342, <-----this is the pump you need to use, at least for the MSP. the issue is the way that the screen attaches to the pump, it can only attach one way because of the way that it sits in the pump. someone please make a note of this at the top of this thread before someone else makes this mistake...(hand)My other reply mentioning that there is no difference was in response to your "but you dont have a MSP" statement, not an answer to your original question. :)

[1FASTMSP]

Errrr... I installed the Miata pump mentioned in the first post today on another MSP. It went in fine.
right, this is the one to use, the GSS 342, the other one is backwards from what we need, it won't allow the screen to sit the way it needs to in the tank.

[Sky_high]

Advice to anyone doing this mod.....buy 8 extra screws (the soft ones that hold the unit in place) from the dealership. As he mentioned...they are very soft and can easily strip (which will most likely happen)

Good How-To.

[duMb KeoLa]

wooohoooo...finally got mine in thanks to big dave (pro5)...but we have one question..

how loud is the new fuel pump supposed to be over stock? we put it in and its louder...but not as loud as we expected... what could be the problem of this?

thanks

[duMb KeoLa]

okay...well we took it for a test run and got into some trouble...the car wont run good at all...it hesitates in everygear as long as there is load on the car...i had to run in 3rd gear at 80mph to get a 14.7-15 on the wideband...and thats the best reading i got

the car ran great for about 20 miles...then it just went to sheit, we noticed that the pump didnt initially come on when the car was first turned on (it didnt have that humming sound like it was pumping fuel to the engine...) but it started. now i dont know what to do or why its acting this way

anyone else know what could have caused this? any help would be great...thanks

[TurfBurn]

Keola, I have an inline setup, but when I turn the key on I'll get a hum from the pump for a little bit, and then it goes quiet until I start the car and it is actually running.

You will have to completely retune your car with the pump, it changes your fuel pressure in the lines (I'm pretty sure, but please don't quote me on it!) and that will totally fubar your AFR's. My pump fluctuates with voltage in the car, and just the minor pitch changes I can hear from my pump (MSD inline) I see jumps of as much or more than 1.2 points of AFR. So it's a pretty major deal just in voltage fluctuation.

[TurfBurn]

Also, you can leave the backseat parts off, and once the car is started check to make sure you feel the pump vibrating and that everything looks good to the eyes.

Are your AFR's richer or leaner than what you had before?

[orangezoom]

I can hear mine pump when I get out of my car when it is at idle , almost sounds like a quiet vacum cleaner

[duMb KeoLa]

yah...mine sounds the same as that...but the only thing was that when i initially turned the key on (the first time) it never pumped. i can hear the car humming when its at idle, but the afr is totally fucked up. i cant even drive the car because its so lean, so i dont know what the fuck is going on. i tried to start the car today and nothing. it sounds like itll kick over then it just keeps turning and no start. i dont know whats going on but i think it might be the fuel pump.

how much does the fuel pump depend on the voltage? i mean, its not good if its gonna run different when the voltage changes...that would mean you cant run a/c, lights, sounds...nothing

[TurfBurn]

yah...mine sounds the same as that...but the only thing was that when i initially turned the key on (the first time) it never pumped. i can hear the car humming when its at idle, but the afr is totally fucked up. i cant even drive the car because its so lean, so i dont know what the fuck is going on. i tried to start the car today and nothing. it sounds like itll kick over then it just keeps turning and no start. i dont know whats going on but i think it might be the fuel pump.

how much does the fuel pump depend on the voltage? i mean, its not good if its gonna run different when the voltage changes...that would mean you cant run a/c, lights, sounds...nothing
I'd assume that since your problems started when the pump went in.... I'd check to see if it is picking up fuel ok.. check to make sure you have pressure and so foth... don't know if you have a fuel pressure gauge or not.

Mine seems to fluctuate with voltage, I don't know if the walbro behaves better or not... I'm thinking about getting one because my pump system has done a few weird things of late.

I'm thinking of using a high amperage voltage regulator to make sure that the voltage doesn't fluctuate everywhere and is locked in very tight.

[TurfBurn]

Keola... any word?

[TurfBurn]

well installed mine last night.... car is running... but it was quite a bit lean... I richened the maps by about 16% to compensate for out of boost operation, but boosting it is still lean. I had to pull the pump in and out twice... so I'm wondering how much I messed that seal up. I'm only seeing about 30 psi of fuel pressure, I forgot to check the pressure before I did this whole operation, so I don't know what I had before :( but I believe it was supposed to be about 40. So I'm going to pull things again, pull that seal out and see if it is ok. If it isn't I'm going to use some high quality urethane adhesive to fix it if the dealer doesn't have one of those parts around. Hopefully that will solve the issue, otherwise if everything looks fine I'll be retuning the car at 30 psi fuel pressure...

[1FASTMSP]

i am just curious if you ever resolved this issue, and what the outcome was...

[TurfBurn]

never figured mine out... I tuned it to be about right... and not long after my engine blew on the race track (unrelated to the fuel pressure...was rich at the time)... so dunno! But never figured it out.. I'll play with it when I do my new engine in the spring.

[tekkie]

I dont know if this was mentioned in this thread or not but this makes it even a little easier.

My walbro had 4 plastic tabs on it at the bottom, I just heated up a razor blade and cut them off, then I cut into the plastic piece as shown in the attached file. This way you do not have to cut the edges of the plastic piece that holds the pump in place, no wire ties, less chance of it falling off. The rubber support that was there had to be removed though, but its holding perfectly this way. Now you can go back to stock if you want :D

[Brian MP5T]

Sweet Job on the How-To!

[livelyjay]

This how-to is a bit old, but just wanted to add a little tip before doing a fuel pump swap. These things make it a little easier:

Less than 1/4 of a tank of gas before removing the pump
Unplug the power lines to the pump, then crank the engine to get the fuel out of the system. It may start, but it will die very quickly.

This will help decrease spillage of fuel inside the car.

[duMb KeoLa]

what fuel pumps can actually be used for this? i got one from mam and its the gss340 and it doesnt look anything like the right one... anyone know the deal?

[ebmp5]

anyone got a thread like this for the p5! :rolleyes:

[1FASTMSP]

right, this is the one to use, the GSS 342, the other one is backwards from what we need, it won't allow the screen to sit the way it needs to in the tank.

(poke) :)

[TurfBurn]

anyone got a thread like this for the p5! :rolleyes:
Uh.. P5, MSP, MP3, 2.0L anything else... all the same.

[TurfBurn]

what fuel pumps can actually be used for this? i got one from mam and its the gss340 and it doesnt look anything like the right one... anyone know the deal?

No shit eh??? wow... got pics?

[duMb KeoLa]

No shit eh??? wow... got pics?

http://www.msprotege.com/members/duMb%20KeoLa/DSC04094.JPG

http://www.msprotege.com/members/duMb%20KeoLa/DSC04095.JPG

well... this sucks... not only will i not have my walbro fuel pump in but i cant even put the fuel rail on because i realized that the fittings for the ends didnt get sent to me either... guess i gotta call beau again... sigh

[Mental Addiction]

Keola,

The GSS 340 is what we use. Pull the red cap off the base and put on the filter I provided you with. The GSS 340 and 342 are the same pumps except that the 340 has a larger inlet and uses its own filter. We do not use the 342 because you have to reuse your stock filter and the inlet is very small.

[duMb KeoLa]

thanks for clearing that up buddy... i will do this today and let you know how it goes... ill post pics also so everyone can see how the gss340 looks in the car...

[t3ase]

you ever get the 340 in?

[kyle's protege5]

I dont know if this was mentioned in this thread or not but this makes it even a little easier.

My walbro had 4 plastic tabs on it at the bottom, I just heated up a razor blade and cut them off, then I cut into the plastic piece as shown in the attached file. This way you do not have to cut the edges of the plastic piece that holds the pump in place, no wire ties, less chance of it falling off. The rubber support that was there had to be removed though, but its holding perfectly this way. Now you can go back to stock if you want :D

this is exactly what i did. It clips on nice and firm and no tie wraps. If the dang wife hadnt taken the digital camera tonite, I would take pics. I think the how to should be updated with this way and not the tie wrap way.

[protegeric]

Is this, "Step Eight: Either transfer the the screen to the new pump, or if you bought a new one, put it on the new pump." referring to the fuel filter? I`ve wondered about changing my own fuel filter and I would like to. Do I do it pretty much the same way?

[kyle's protege5]

Is this, "Step Eight: Either transfer the the screen to the new pump, or if you bought a new one, put it on the new pump." referring to the fuel filter? I`ve wondered about changing my own fuel filter and I would like to. Do I do it pretty much the same way?
No this is not the fuel filter. This is the little "bag" filter that filters stuff from getting in the pump. More of a screen I'd guess you could say.

[protegeric]

ok, are there two things that should be changed then? the filter and the screen deal? or just the filter?

No this is not the fuel filter. This is the little "bag" filter that filters stuff from getting in the pump. More of a screen I'd guess you could say.

[kyle's protege5]

ok, are there two things that should be changed then? the filter and the screen deal? or just the filter?
You never really have to replace the bag screen, just the filter

[protegeric]

OK, I`m gonna change my filter. Check out the links in my sig. also for Protege info. Thanks...

You never really have to replace the bag screen, just the filter

[Blue_Speed]

may sound like a dumb question, but does the msp rear seat just pull off? feels like it's latched on somewhere.

[tekkie]

yeah if you pull up on the front of it there are 2 plastic clips that hold the seat down, dont worry you wont break them they are real sturdy

[protegeric]

now the dealer is tellin me there is no filter. whats the deal? i went to buy one and they wouldnt give me one... anyone got a part # or etc.?

[protegeric]

bump for part # or etc.

[protegeric]

bump

[protegeric]

bump for part # or website to order one or somethin

[TurfBurn]

I came up empty with my suppliers to get walbro.... talk to Ken (CaptainKRMp5) or email protegegarage.com as they may be able to do it.. Ken will take carte of you.

[Blue_Speed]

^ that's where i bought my pump from. should be on the protegegarage site.

[dirtysouth_msp]

bookmarking

[Jackelope]

^ nice how-to, started this tonight (striped one of the screws.... doh!...) will finish up 2morrow

[jakemp3surfin]

subbin

[Jackelope]

btw.. i finished the install, great how-to, helped my car alot.

[SLSPERFORMANCE]

Bump for great write and a must mod.

Sale going now
http://www.mazdas247.com/forum/showthread.php?p=3027477#post3027477

[mspeedP5]

subbin'

[khaosman]

Yay 3 of my 8 screws stripped (yes, I was using a #2 Mac screw driver). Fucking winter roads and the shit they do to them...

[magnumP5]

So were any of you other guys that got this installed experiencing the leaning out that turfburn and dumb keola were experiencing? I figured, if anything, the higher flowing pump would cause the car to run even richer. Just curious as I'm going to install my AFC finally tomorrow and I figured I might as well install this as well.

[dominoy2k1]

this is the only problem i had.

click (http://www.mazdas247.com/forum/showthread.php?t=64950&highlight=fuel+pump)

[magnumP5]

Interesting - that would explain the leaning out issues you all were having. Khaosman, any input?

[dannyboy17]

EXTREMELY well elaborated. Just read this 10 mins before changing the fuel pump and it made my life 10x easier. Followed all the steps in order with the correct tools and had no problems whatsoever.

Even though I coulndt add the zip tie in there, I made sure it was tight and wont fall.

A+++++ How to

[tacio25]

Keola,

The GSS 340 is what we use. Pull the red cap off the base and put on the filter I provided you with. The GSS 340 and 342 are the same pumps except that the 340 has a larger inlet and uses its own filter. We do not use the 342 because you have to reuse your stock filter and the inlet is very small.

So let me get this right....the MSP will use the GSS340 and NOT the GSS342? My MSP went to shiza tonight and I've been researching for over an hour. Everyone is telling me its the fuel pump. I was cruising on the freeway when car just felt like it ran out of gas. (Full Tank) She would start up fine but would die almost immediately. Everytime I try to start she will...but will die shortly thereafter. If I give her some gas she seems to bog a little, backfire, and then die. But if I floor it she will stay on...but the moment i let up on the gas she immediately dies. Can this be the fuel pump or filter? Even the tow guy said this. Please help!!!

[dominoy2k1]

i believe the filter is a lifetime filter. 340 is the right one. i used 342, it works just fine but takes little more work to get in on.

CLICK (http://siteground207.com/%7Eprotegeg/product_info.php?cPath=32_167&products_id=398)

[shane02pro5]

Bump for an update...I'll be putting in my GSS342 and wondering about leaning out. I'm hoping this is just related to the torn grommet seal.

I'm debating whether I should wait until I get my rc750's flow tested and swap them in at the same time so i don't have to retune twice??

[shane02pro5]

Bump!

[dominoy2k1]

when it functioned properly i never had problems with leaning out. always held pressure fine.

[mspHtown]

**i posted this in the other thread, but here it is again.**


i recently put in the walbro fuel pump and it DID NOT change the fuel pressure.

However, i do have an aftermarket fpr (aeromotive unit). Maybe this unit does a better job regulating and sustaining the set pressure...?

[shane02pro5]

Install went fine although 3 out of 8 of those crap screws stripped. Added about 4% fuel in vac from -10 thru -22 and pulled some out up top for a perfect 11.8-12afrs at 20-22psi. Still maxing out so rc750's will definately be going in.

[spotthedogg]

This is a universal pump right? Is there a fit kit or something that makes it Miata or RX7?

[shane02pro5]

I think this is originally the same as the miata... we just use the stock housing and filter. It's a little longer so you just have to trim the cap a little to get it to fit. I say try to get a new sock filter from the dealer since I had to reuse the clip and it got a bit mangled trying to get it off without breaking it.

[spotthedogg]

yep, useless on a NA P5....unless you've got a 240whp NA engine...

I am putting one in my N/A P5 because I get fuel starvation on the track in high G left handers. I talked to a couple AutoX guys and they said it cured the problem.

[shane02pro5]

First I've heard of that! You may be more concerned about oil starvation if you don't at least have an AWR oil pan.

[khaosman]

Just run with more fuel in your tank...

[spotthedogg]

There was lots of fuel in the tank, over 3/4 full.

[mspeedP5]

Put my pump in today. Works like a charm. No issues other than the sliced thumb on the edge of the floor opening when I was pulling a fuel line connector.

[LinuxRacr]

This is a great write-up. The only thing I would add are wider shots, and more angles of the fuel pump assembly.

[dmention7]

I installed my GSS342 this morning, and this writeup was immensely helpful! One part I was a little unsure of though... When I removed the stock pump from the housing, I could've sworn that the white plastic "bushing" on the pump outlet was snapped into place in the pump housing. But when I was installing the walbro into the housing, I couldn't for the life of me get it to snap into anything. So I just placed it on the new pump outlet in the original orientation and placed the pump back into the housing.

In this pic (scavenged from another thread), it's the part immediately below the circled rubber seal that I'm talking about.
http://www.mazdas247.com/forum/attachment.php?attachmentid=17849


Everything went back together just fine otherwise, and the pump works perfectly... does anyone want to reassure me that I did it right, or tell me to go pull the pump and try again? hehe

[shane02pro5]

Thats normal apparently i did 2 pumps and neither one would allow the retainer clip to stay but the pump cant move anywhere for it to leak so...good to go!

[dmention7]

That's what I was hoping to hear, thanks.

[MSP Kirk]

Sub

[stinkycheezmonk]

Just did this tonight and on the way home I had the same hesitation problem whichever guy described years ago. I stirred up quite a bit of crap in the tank during the install, and am wondering if the hesitation was from dirty fuel possibly? I'll drive it again tomorrow after everything settles, just wondering if anyone else has experienced this.

Also, have a new method for getting the GSS342 to fit properly without hacking up the securing clip. Will post that tomorrow as well.

[pablosqy]

Just did this tonight and on the way home I had the same hesitation problem whichever guy described years ago. I stirred up quite a bit of crap in the tank during the install, and am wondering if the hesitation was from dirty fuel possibly? I'll drive it again tomorrow after everything settles, just wondering if anyone else has experienced this.

Also, have a new method for getting the GSS342 to fit properly without hacking up the securing clip. Will post that tomorrow as well.

some ppl say that de GSS340 is the one that fit without do any mod...