luism12lm

I have an 84 GSLSE (13B) and I have a problem with the fuel pump or fuel system. When the car is cold, the car starts and runs without any problems but after a while I can hear the fuel pump buzzing and the engine dies. Is like, there is not enough fuel getting to the engine. After a while when the engine is warm/cold the car starts without any problem. At first I thought it was the fuel pump, but this is the third fuel pump that I put on the car. Any help will be appreciated.

Thanks,

Luism12lm

Whisper

Put a fuel pressure tester on it and see what's going on, I guess.

LongDuck

I'd thoroughly check the wiring to the fuel pump. With our cars getting older, the fuel pump is pretty exposed and the plumbing and wiring could have gotten corroded causing your intermittent problem.

I hope you held onto the other fuel pumps, since they don't seem to be the root cause of the issue.

Also, check your leads to the fuel pump from the fuse block along with the ground at the pump. These would likely be just fine, but the car starts at all, you're getting good pressure.

After it dies, it sounds like this occurs after it warms up...? Possibly it's not the fuel pump, but actually the Thermowax Pellet and Fast Idle Cam out of adjustment. Search these forums for those items along with tips on how to set them.

On startup, pedal to the floor, then release it. Crank engine and it will start. No reason to 'gas' a fuel injected car. Once the engine warms up, it returns to the standard idle cam position on the Throttle Body, which should drop idle to 850-900 rpm or so.

Report back,

Qitech

iTrader: (2)

curious if you resolved this issue because I have the identical issue and was about to change the fuel pump. Not now. I tighten down a very loose screw that appears to be a gounding screw for the pump housing and the problem went away for 2 days but now its back. To add to this, I observed that the buzzing goes along with a drop in rpm. A solid buzz will give less pressure all the time, an intermittent buzz will only drop pressure during the buzz.

Qitech

iTrader: (2)

Well... I found my problem quicker than I thought.

I visually followed both wires from the fuel pump into the interior, under the side step, under the driver side carpet, up the center consul and it lead to kill switch. One of the wires is frayed and broken and barely hanging on. I'm going to reconnect them properly and see if that was the sole problem. Either case, if it were stock wiring, I would have found something else.