Fuel Delivery Troubleshooting

[harrydunn]

Drove the GMC around a bit this afternoon and it ran well. Well plugs are leaking causing some loading up but that's another story. Shut it off for 30 minutes, cranked it back up and it was not running well. As soon as I gave it gas to take off down the road it fell on its face and not just a minor hesitation. Its idle continued to deteriorate for about 20 seconds and then it died. It's never done that before. Could not restart it. Had plenty of gas in the tank. I verified that I was not getting any gas to the carb. Cracked the fuel line loose at the carb and cranked the truck. No gas. Poured fuel down the carb and cranked it time after time for at least 30 minutes. It would start and run for 2-3 seconds and then die after it had burned the gas that I poued down it--still no gas coming out of the line. Finally, another 30 minutes later, fuel began pouring out of the fuel line when I cranked it. I buttoned everything up and it began to run fine. Stuck her in the garage to figure out what could be going on.

It's extremely hot here today so I thought vapor lock but I could not even get any gas to the carb. Can the fuel line to the carb get vapor lock as well? Is there a fuel sock on the gas tank sending unit that could have been clogged and after an hour of sitting the setiment perhaps dropped to the botton of the tank?

Also, what epoxy, etc. will I have the best luck with sealing the well plugs? They were done a long time ago but probably need to be done again.

Thanks.

--Mark