FreeLoader

Hey I was wondering about the Gas tank baffle that came in the 1LE's...does anyone know the part number, or if it was a different tank, or anything really about them? in any case do they still sell those tanks or just the baffles or anything? thanks for the help

91z4me

I think that if you order a gas tank for a third gen it is the part number for the 1LE tank that might be the only one still available. Also I think somewhere through 91 all cars got that tank. But I am not sure.

92GTA

iTrader: (11)

Fuel tank: 10121026
Fuel sender unit (longer): 25094804
Fuel strainer (double screen): 25121120
Fuel Pump: 25116163

FreeLoader

Man you rock, i never expected to get the part #'s that quick

92GTA

iTrader: (11)

No problem Yeah, sorry it took me almost 3 hours j/k

FreeLoader

Hezues, 3 hours? You wanted to know the answer to that too right?

where did you get that info from, ive been lookin for those part #'s for a while, it just struck me tonight to ask on the message board

92GTA

iTrader: (11)

They are on my website along with the P/N for every single 1LE specific part GM ever made...

FreeLoader

and your website is....

FreeLoader

nevermind, looked in your profile

fisherbody86

If I'm not mistaken, all 91 and 92's got the baffeled tank.

FreeLoader

did the 89 v6's ever come with baffles, or did they come with a different gas tank or anything?

My friend had an 89 v6 and he said he ran the tank all the way to empty several times and that it actually ran better because of the reduced weight, while i have the EXACT problem why they made the baffles in the first place, my car gradually runs worse as i run out of gas, and after 1/2 a tank it seems to go down more rapidly, and when its really low i somtimes just randomly stall.

So did the v6's get a different tank or what?

92GTA

iTrader: (11)

\

Correct, on the TPI cars anyway....

iroc22

I was under that assumption too but at my parts store the 91-92 tanks are the same part number as the previous years. Does anyone have some hands on experience with a 91-92 tank or have documentation on it?

If it's true I didn't take the tank off of my 91 Z28 parts car before it got scrapped

92GTA

iTrader: (11)

I can tell you right now from my driving expierence it's true. My 91 GTA had one, and my 92 GTA has one. I've owned enough non-baffeled 3rd gen's to know the difference....

Drew

iTrader: (58)

Of the thirdgens I've owned, only one exhibited issues with fuel delivery while cornering with less then 1/4 tank of gas. It was an 89 RS L03 Auto. Every other thirdgen I've owned has been content down to the last drop in the tank.

Everyone loves to hype the 1LE parts, but the truth is the only 1LE specific parts are the front brakes.

92GTA

iTrader: (11)

Here's what I don't understand. The 1LE gas tank is 18.5 and the reg. tank is 15.5 Then in 91 all the TPI cars got a baffeled 15.5 so there should be 3 different P/N's. Also, if the 1LE tanks are 18.5 then how come there is no special P/N for a fuel/temp guage for the 1LE cars that is calibrated for the 18.5???

FreeLoader

this may be kind of a stupid question, but would there be any kind of minor hp gains by getting the baffle if you don't have one? cuz i know i don't have one, and my car gradually gets slower as the gas tank empties, so i'd think i'd be able to maintain more hp with the baffle...

btw, i thought the reg tank was 15.7

fisherbody86

the old non-baffled tanks from 82-90 have a revised part number that crosses to the 91-92 baffled tanks. So if you buy a tank new from the dealer, no matter what year you ask for, you're getting the 91-92 baffled gas tank. That's why the part numbers are the same for the non baffled and baffled tanks, GM dropped the ond p/n in favor for the new p/n. (O'Doyle rules!)

drop-top IROC

My sentiments exactly! Of the 3 third gen's I've owned, my '89 RS L03 Auto is the only one I've had fuel starvation problems with during hard cornering.

FreeLoader

I stumbled across this old thread when I just happened to be looking up the exact same questions.

I'm getting some hints that my fuel pump may be dying, and I always told myself that if my pump died, I'd get the baffle setup for my car.

my question is, what exactly do I NEED to get that?

1. is the baffle attached to the sender or tank
2. is there anything special about the sender unit
3. are there any other parts that I'd need (different screen, filter)

also, I have some questions about the fuel pump itself.

I have an L03, so obviously my pump only runs at a max of between 13-15 psi, and if I remember, all tpi and on fuel pumps had something like 45-48 psi.

and although i'd done some research on gph, I don't remember much of it now.

so, my questions for that are

what would happen if i put a 45 psi fuel pump on my car?

also, what difference does more or less gph make, assuming that I'm still running at 15 psi.

in fact, could someone just explain to me what the differences between the two are and how they're important?

thanks a lot.

Genesis98

Supposedly the pn 25094804 is for the 1LE Sending Unit, and pn 25121120 is the required strainer for it, but those numbers have been replaced by 25027221 for the sending unit and 25027354 for the strainer.

Also any tank after 1990 had the baffleing in it. I don't know if that means sending unit or strainer after 1990 was the same as the 1le but the tanks are the same.

Genesis98

Also here is an image comparing the normal TPI Sending unit and the 1le unit.
The first picture is the 1le unit.

Genesis98

This is the Normal TPI sending unit.

Gladstoneiroc

iTrader: (1)

I was slightly confused in early posts, 91-92 TPI got baffled and 91-92 TBI/ V6 didn't, right? Hmmmm.. I'm putting in a new pump later maybe I should try to snag a baffled one. I'm pretty sure that my 91 TBI isn't but I also figured it could be a weak pump.

FreeLoader

ok, so the tank is what I need to replace to get the baffle.

as far as the sender units go, I really don't know what I'm looking at.

I DO know that in either case those are tpi, and I have a tbi, so I'm not even sure I could use those sending units.

I guess I'm just wondering if the baffling alone will help the tank from starving itself?

that, and what it is that makes the sender different, if it really is, other than the swinging thing, which is still under debate as far as I'm aware of.

thanks for the help.

Genesis98

The Fuel strainer is twice the size on the 1le.

FreeLoader

can i just change the strainer?

Genesis98

I don't know the answer to the question hopefully we can get somebody in here with some knowledge of this and answer some questions.

Daniel U

I have an 88 IROC that I'd like to swap to the 1LE OE tank. Will the 18.5 gallon tank fit/ in the rear just the same? Will I find a new replacement? Maybe ebay? Anybody HELP!

FreeLoader

god this things old.

alright, about 6 months ago my fuel pump died, I replaced it with a tpi fuel pump and strainer, touched nothing else.

I have practically no problems in corners, and I can run the tank down to about 2 gallons with ease, that doesn't sound like much, but how many people here(w/ stock tbi pumps) fill up their tank to 13.9 gallons ever?

oh, and when i say with ease, i mean that the only reason I gas 'r up is because it's been on E for like 2 1/2 days, not because it's starving.

so basically what i'm saying is don't bother, I guess. a 50 dollar fuel pump at autozone will take care of 80% of your problem, you'll still have to drop the tank, but it's a hell of a lot cheaper.

as for whether or not it fits, the 1le should fit perfectly, but if I were you I'd go with the 98-02 plastic tank. some modification has to be done, but it's fairly basic, and in switching to that tank, you're moving the coal canister straight to the tank(so it'll be gone from the engine bay), it'll weigh less, and you can put in more gas, as well as the baffling problem being taken care of.

yuh, those are pretty much your two best options.

Daniel U

So the 98-02 tank has baffles? I have a TPI car and I still have the fuel starve problem on 1/8 tank on a hard corner. I'm not hung up on looking like a 1LE so the 98-02 tank sounds good. I just don't want to have the same problem. How extensive are the modifications you speak of? How many gallons do they hold? Anyone ever done the swap? HELP PLEASE!

FreeLoader

the tank holds 16.5 gallons, honestly I'm not sure if it's baffled, but i know you can run 4th gens down to empty without much trouble for the most part (basically I can't make any promises, but I've never heard, seen, or felt a complaint, and i own one, my friend owns one, im on their forums, so on, so on).

as for the modifications, i'm a little bit fuzzy on those, you'll want to do a search on here, several people have done it. for the most part its the fact that the filler neck has to be cut something like 1/4"(it's rubber), and something has to be done to the fuel lines going from the tank to your hard fuel lines(the lines going from the tank are rubber too I believe).

originally I didn't understand what the difference was in the strainers, but I think i understand now. the strainer I pulled out of my 88 connected to the pick up at the end of the filter, whereas the new one had the connecter for the pickup in the middle, while that doesn't sound like much of a difference, I could see that being a big difference when you've got oh, say, 2 gallons left in your tank, and you make a hard turn AWAY from where the strainer is facing.

also, your pump could STILL be going bad.

on top of all that, we all have to understand that really, there's no way in hell that any car on the road runs at peak performance in hard autocrossing to the last drop. just don't expect it to be something that it can't.

Daniel U

I think that I'll stick with the 1LE tank. Sounds like it should be an easier install. I don't mind the extra wieght as long as it's behind the rear wheels. I'm sure that if GM thought the tank was worth making, there was definitely an issue. One that was fixed with the 1LE tank. I just need to find someone who makes or has a used tank, and someone else who has done the swap. I'm in no real hurry as the car is my daily driver now. I have no other real issues with my fuel tank or fuel system for that matter. Just need to search some more. This was the 1st thread that came up when I searched. Hence the "old" thread. Thanks anyways, Daniel U

TTOP350

iTrader: (8)

didn't know a 18.5 gal tank was made...
I have seen 1LE tanks out and next to a regular tank.. no difference in size..
my 89 Formula 350 has a tank just like the 3 89 TTAs that I have put fuel pumps in...
I have put fuel pumps in 91-92 V6 cars and they even had the cool fuel tanks