I just beat this problem on my GS, or so far so good :Brow: Then I went out and bought a Chevy....I know, I know. This thing runs a stock tank and I suspect stock tank internals. The fuel line is stock and it runs through a regulator on the firewall with a gauge. There is a good sized screen filter just before the reg. There is a Holley elec. pump on the tank. Start it up cold and it runs great with 6-7 psi on the gauge. Get it into town with some stoplights and it makes it a mile or two before dying out. There is then no fuel pressure, pump sounds much different, much quieter. I disconnected the fuel line before the filter and there is nothing there, nothing. Run the pump with the key on for a few seconds and fuel starts coming out. Pressure remains very low, 3 psi or so. Once out of town at 60-65 mph no more problems, makes it 20+ miles. I checked the gauge when I pulled it into the garage and it was at 0. Let it cool a few hours, turn the key on to run the pump and back to 8 psi on the gauge. Doesn't matter if the tank is empty or full. Drove me nuts today, dead twice today (hot out) with a good 20 minute wait each time. I've never heard of this happening while the car is running, just dying like that. Then even with the elec fuel pump the pressure just doesn't want to come back. Any ideas? I know I can probably track this down, just had to vent. Fortunately we had the Buick along as reliable transportation :TU:
You might just have to vent, lol. I had a similar problem once. I'd be cruising along and suddenly it wouldn't go over 60, then 50, then 40, then it would stall. After a few minutes it would start up again and run fine for a while. I thought I had vapor lock due to hot lines under the hood. When I finally went to change the (mechanical) pump, I found that the replacement had 3 connections and the one on the engine only had two. A few months earlier I had dropped a junkyard engine in. It's fuel pump only had 2 connections, so I just plugged the return line. It turns out I was getting a vacuum in the tank which eventually overpowered the pump. I'm not sure if you are having a similar problem, but if you can get it to occur reliably, try removing the gas cap and see if that helps.
