806camaro

This is a on and off again problem daily. Car is 1990 IROC 305 TPI. I can be driving then give it gas and the car bogs down, does not want to go faster. Then a moment later I can give it gas, and the ***** will take off!!!! Bad fuel filter, fuel pump going out?

SLUF681

Subscribing. Same thing happening on my 92 Z28 350.

88gtatony

subscribed also, having a similar issue with my 88 gta 305 tpi

SLUF681

I'm changing the fuel filter on mine this evening. I thought I was going to be on the side of the road this morning on the way to work. Stopped and filled it up (was on 1/4 tank) and it isn't nearly as bad. Mine gets worse on longer trips. I just bought it 2 weeks ago, after it had been sitting for a little over 2 years.

fozzi58

The gas tank may have debris (rust particles, dust, etc) in it if the car had been sitting for some time. Had this same issue on my 86 fb a couple decades ago. I had to drop the tank to clean it out. The tanks are still metal on these cars as opposed to the composite tanks on newer cars.

Change the fuel filter first Then search the boards for "Vapor Lock" issues. In short, if your engine bay is too hot the gas is evaporating in the fuel line before it gets to the engine (carb/tpi/tb).

If you have corrected these issues the next step is to drop the tank as I said I needed to earlier, and clean it out cause there is **** getting caught in the tank pickup.

EDIT: I stand corrected. Its been a decade and half since I last owned a TPI fbody so there is still some foggy-ness regarding issue resolution. And I never had this issue on my LS1.

See this thread for Vapor Lock - https://www.thirdgen.org/forums/tech...apor-lock.html

SLUF681

Ok. So I replaced my fuel filter today. What came out of the fuel filter was what I would call ideal! Rusty water and some gas. 25 minute drive home from my father-in-law's house, and the car ran perfectly. I had a sneaking suspicion that's what I would find, so I bought the cheapest filter, knowing I was going to change it a few times before I get it straightened out. Obviously, I may still wind up having to drop the tank, but I feel I've eliminated the pump as MY culprit. On that note, 806camaro, I'd suggest changing YOUR filter also. It's cheap, it's easy, and I can't find a negative thing about it. Good luck!

Mumble813

I had the exact same problem in my 87 350 Iroc, changed the fuel filter about a week ago and it hasn't given me a problem since. The fuel pump was also making a loud whining noise before and that has quited down as well.

SLUF681

After about 3 days, mine started doing it again. Yesterday, I took it to a buddy's house that has a lift. I pulled the tank and cleaned it out. It was SUPER RUSTY. The car sat for over 2 years before I bought it. I went ahead and replaced the fuel pump while I was there. The newly replaced filter was packed with rust, so it obviously got changed too.

mcrandrz

Dont just replace the pump and not do anything to the tank. I'd suggest replacing the tank. Its the best 200 you can spend. I got my car after siting for years and went through 4 pumps before changing the tank. Since the tank no problems. Its insurance because fuel controls everything.


Posted from Thirdgen.org App for Android

SLUF681

I cleaned the inside of the tank. You would be amazed at what swing chain will do to the inside of a tank.

806camaro

I bought a wix fuel filter, but have yet to change it. Just came back on. 1200 mile trip, the car runs awesome, get about 25mpgs. But still have a strong smell of fuel.

91rsboyy

iTrader: (1)

i know this thread is a year old but i have an 88 sport coupe and i replaced the filter and pump, but still bogs down but it is constant. if you lay off it runs fine but when you give it to much gas it just drops until you let off the gas

BigbossZ

Exact same problem im having. No has replied to me when i posted it. Have an 86 3.1 swap. Ran fine before, was sitting a few years but ive driven it quite a few times. Changed most fluids along with a fuel filter. May drop the tank to check it out.

87CamaroFix

Well if you never figured it out i ran seafoam through my gas tank and my pcv valve changed my fuel filter and my o2 censor and it seemes to do the trick i had the same exact problem

BigbossZ

I found my problem to be a bad throttle position sensor. Runs beautifully now. But it would be pretty obvious if you have a CEL and pull codes. I changed fuel pump filter and all. Clean filters then changed tps and now she purrs.