delete thanks

 

i think it is "PFI" (port fuel injection?) but i'm not sure. it is definitely not either TBI nor TPI in a traditional sense...

ask that same question on the V-6 board and you may get more help.

-brian

 

It's multi port fuel injection....get the TPI V8 fuel pump, that's what is generally recommended.

 

ok yeah i went across town and popped hood and it says multi fuel injection on the plenum

i take it that all third gen cars use same fuel line size then ?

i think a V8 tpi pump is gonna probably cost more than the 2.8l replacement pump will, what the deal is that is the cardoesnt run cuzof pump failure according to person i got car from and he cuthole in sheetmetal above tank and pulled pump and currently has a new pump halfway installed and thats how it is right now and hmmmm

i just want to see if engine runs good or not, without spending on it,,


i dunno....

anyone got any ideas ?

its an 88 MPFI 700r4 3.42 bird


thanks for helping so far.

 

It should say MPFI right on top of the intake, a fuel pump price is not your only consern.

you gotta almost remove the rear end just to get the gas tank down to change it. The pump is in the tank.

Im sure they are selling it cause of that reason, not a fun job. cost a bit to have somone else do it.


still if that is all thats wrong and the price is right, you found a steal.

I stole mine. KBB 2600.00 paid 790.00, guy said you sould try and talk people down more. I just wanted the keys and the title quick before I broke up laughing.

 

I was just a few second too late. sounds like a good idea. cut through the body of the car instead of droping the tank.

If you got one I owuld love a pic of the hole and it location. Might be a much easier solution.

 

It is not an easy solution, it is a half *** way of doing it solution.

 

The only problem with the Internet is no punctuation for sarcasm.

 

the hole is already cut by the guy i got car from, probably just gonna part it even though it just needs the pump and a driver side fender, the doors are tight and good and interior nice cept for driver seat, even dash pad is perfect, ill probably just waste it all and take the rear axle and pass side fender if i cant get a pump, and it looks like im not getting a pump the way its going so far.............. guess just part it out ! not like these cars are rare or something


thanks

 

Sorry, punctuation is not one of my strongpoints.

 

going less troublesome way about things is not one of my strong points, alwys see, to screw myself over most usually

also i am thinking about possibility of using extrnal inline type of pump,

what size is fuel line on third gen cars ? 5/16" on all cept V-8 cars ? or ?

thanks

 

Facts

It's a PIA for the fuel pump.
Ther right way is the correct & safest way.
You cannot cheat & external this and that.
Not worth the re-engineering effort.
Wish ya was closer, I'd grab the dash pad as I need one.
NO CRACKs, tho

 

Here's a question, I know on 2.8/3.1 TBI (S10) the fuel pressure should be 7-14 PSI is it the same as a 90* Fbodys pressure? I dont have a book with me. If so a good aftermarket inline rotary pump would put out a suffcient amount of fuel pressure and is alot easyer to install.

As far as cutting the floor board, my friend that owns a 96 TA has a custom hatch for changing fuel pumps, its one of those steel gas doors they sell in JC Whitney. Makes changing the fuel pump a 20 minute job, I guess when you changed 3 the hard way in less then a year cutting a holes sounds like the best idea in the world.


Edit: Nissan uses a hatch also in some of thier cars, located under the rear seat.

 

All TBI engines run about 9-13 psi except for big blocks. They run around 30 psi. You can't use a TBI pump with Port Fuel Injection though. It's not enough pressure.

I never seen anyone use an inline pump so I don't know how well it would work or where you could mount it........

BTW, a lot of the newer Buicks come with an access panel in the trunk.

 

how much GPH and pressure does TPI have to have minimally to run up to like 4500 rpm or so ? as if id ever hit 4500 with a 2.8 and 700r4 anyways.. maybe i can find an inline pump meeting the needs of a 2.8L


thanks

 

Thats why I was asking how much pressure the 2.8/3.1 needs to operate. A rotary pump can be mounted under the rear of the car no problem, I had on on my carbed Camaro. If the fuel pressure is only between 7-14 PSI rubber line will hold, fNord and Dodge use steel/rubber mixes in some of thier cars with no safty issues. Ive seen alot of (TBI) small block trucks running an aftermarket inline pump when the in-tank pump took a dump with no problems so its not an issue of cant be dont just how much pressure is needed to pop the injectors.

 

Actaully there is an exteranl pump
Bosch makes it, I had it (still do), for the 1975 Fuel Injected Buick (imported) Opels.
Pressure is about 45 or so, constant.
Now the idiot engineers stick a stupid door over the tank.
Like DUH guys.......
Didn't ya used to do the to ....
Shock absorbers, master brake cyliders on older cars have an access door built into the ride.....
Really is a "duh" engineering mistake (no fuel pump access door on F bodies).

 

you sure, cause I looked anf looked and even 200 dollar modles in catalog wont supply enough fuel for our MPFi system. I would go external in a hear beat.

Thought about using dual 16s but that get tricky, one in the back and one in the front and will they fight, so on so forth.

 

Yea they do if you want to pay. The cheapest one I can find is a Mallory #650-4142 (Jegs) 3-50 PSI $253.99.

 

ouch..

i guess i will try and find the lowest priced TPI pump i can find, anyone know what those would be ?? V8 one ? V6 one ? year ?

the towing guy i have been waiting on to get the car to me STILL hasnt doe it, so i called another one last night and he said this morning sometime, im warming up the truck right now as i type this

if i cant get the bird to fire up( i kow it runs but it wont stay running without fuel from a cup poured into the MAF intake thing) then im just gonna part it even though it would be great as a parts getter car, it has very minor rust compared to other cars this old, pretty clean actually, but the front fender and rear quarter damage though..and plus its just a 2.8L car anyways..

thanks

 

You probably don't want the cheapest TPI pump you can find, or the cheapest MPFI pump, for that matter! And if I were you, I'd put an original AC/Delco pump in, from the dealer. Either pump should run $100. I paid $95 for my Borg-Warner pump from Pep Boys- and two years later, it died again. Man, was I mad. I got another replacement Borg-Warner pump for free, but when I weld in my new 1/4 panel, that BW piece of crap is coming out, and an AC/Delco pump is going in. Funny how the people at Pep Boys- the parts counter and the cashier chick- said "Oh wow, it lasted 2 years, that's pretty good." I was like "NO! The original lasted 10 years! Ever change a pump in a Firebird??" I bet they wondered why I was so mad.

Check out this link for more info, and no, I wouldn't go cutting a hole in the floor. I'd try to get that hole welded up... if a hole was meant to be back there, GM would've put a hole back there. Do it right and drop the tank. None of it is technically hard, it's just a lot of regular work. And DO THE JOB OUTSIDE! Here's the message: <a href="showthread.php?s=&threadid=131081">cutting the floor to replace fuel pump????</a>

 

You might not want to do that- it's a good way to have the whole top end of the motor blow off because of a backfire.

 

I'm starting to dread replacing my pump now. I'm guessing it's original too just as my timing chain is probably original. 13 yrs and 153,000 miles.

 

Here's the deal, it MAY go.
Atleast you can be thankful & the knowledge of it pump failure won't be a "what is this NOW" problem...
Drag part is your location for parts. Good thing is it's gotta be available over there easy, too!
And atleast ya know how to handle it.
No, it's not a fun project, either.

 

i wasnt the one doing it and this was before i even knew about the car being in existence, i havent and wouldnt do that

thanks

i have since last replying in here found out that the pump doez work, it was grounded out wire near tranny dipstick tube and fuse blown under hood.

still gotta at least reposition the fuel tank if not pull it to repair chopped fuel lines at top of tank and put the sending unit all way into the tank and lock it down, the guy left it like how it is now, he never even needed to mess with fuel pump that wasnt even what was wrong