i understand that this is a very common problem. i have switched out the in tank fuel pump twice now and with this summer heat after driving for about 30 mins a high pitched noise comes on (from the tank) and eventually it will shutdown on you. i have not shutdown yet with my new fuel pump although, i have not drove long enough for it to shutdown.

i guess my question is has anyone found a solution to this problem?

Audio file #1 is the humming coming from my gas tank (im assuming the fuel pump).
Audio file #2 is after my car stalls out and me trying to start it back up. (the fuel pump trying to prime is a different noise it usually makes).

 

I just replaced my pump last Saturday, took me all day to drop the tank!!!!
Man, I'm thinking someone needs to figure out how to rig an external pump setup...

 

The solution for my problem seemed to be that my tank wasnt building enough pressure and was causing the pump to fail. does your tank hold pressure? there was a bad crack in the filler neck, and once I had the tank replaced, I had the pump replaced and no more problems. (I had the pump replaced twice before the tank was done, and they both failed within weeks. been months since the tank and pump were replaced, and no problems yet.)

 

i have a ventilator valve (its like a check valve) for the tank and when i put it on a massive amount of pressure will build up and if i unscrew the cap while car is running with that pressure, all the pressure leaves the tank and the card idles rough and shutdowns. but if i drive with that valve off no pressure builds up in the tank but eventually the fuel pump starts humming and keeps getting louder and louder til the point it just shutdown. i dont know what to do about it

 

Bump. Any Other suggestions?

 

What year? Tank pressure is regulated with a valve up by the charcoal canister. It releases at a relatively low pressure into the canister to prevent fuel vapors from escaping (part of the emission system). This line from the tank also has a rollover stop valve inside the tank on the sending unit. The backup pressure relief is back by the fuel tank in the and is a white valve mounted on the wall above the rear axle on the drivers side. It needs to get up to a pretty good pressure befire it releases.

I had similar issues with stalling when hot and went through a few fuel pumps. My rollover valve was frozen shut. Next time you change the pump, check it. I also had a bad valve to the charcoal canister so the only pressure release I had was at the rear and I could smell it when it opened. Once I replaced the sending unit, fuel pump and presssure valve by the charcoal canister, life has been great.

As stated earlier, you need pressure inside your tank and what may seem to be excessive may be normal

 

1988 305 tpi
i have replaced the sending unit and fuel pump. a mechanic said that my charcoal canister has a vent inside of it and it was frozen up. so he disconnected the hose from it (the hose that leads from thank to canister). and plugged the end of the canister. im not sure where the valve is near the canister so i can check it out

 

This is what it is and it should be very near the canister itself. On my 91 it was about 6 inches up the vacuum line.

 

By the way, I think you probably have a bad fuel pump. What kind did you put in it last time? I recommend staying away from parts store alternatives and get a Walbro 255.

 

it was a napa fuel pump both were

 

bump just added audio files of the fuel pump humming and after my car breakdowns how it wont let me start back up until it cools down.

 

I've had this problem too. Especially when the weather is hot, the fuel pump would start making noise like it was working very hard, and the car would eventually fuel starve and die. I replaced the fuel pump and fuel filter. No change, the fuel pump started making that noise almost all the time, got hard to start and just didn't run crisp.

Replaced the valve a few inches from the charcoal canister, and Viola!! All problems magically disappeared! It was hard to find the valve, it was crammed between the air cleaner body (Firebird) and the bottom of the overflow bottle, but one bolt pulls out the air cleaner, and there it was.

The new valve shut off in 1 direction if you blow through it, the old one did not open at all and was full of fuel. Such and easy fix compared to digging out a fuel pump, so do yourself a favor and try changing the valve first.

Good luck
TA