Hi Cyril,
No, I haven't yet. I gotr sidetracked on two other repairs so the truck situation had to wait.
It's now appearing that I have a fuel pump/carburetor issue but I have more investigating to do.
Yes, the fuel pressure for the 216 should be about 2-3 lbs.
Place the electric pump back by the fuel tank. It can push straight through the mechanical pump. The electric pump is useful for priming after the truck sits for a while. When you are experiencing the vapor lock problem an electric pump can help to push fresh "cold" fuel to the carburetor.
I'm not sure insulating the fuel line will work. It will eventually heat up and then hold the heat. Try the elctric pump first and see what hapens.
Dumping cold water on the fuel pump can often alleviate vapor lock, at least temporarily.
I'm aware of a classic car tour where one of the cars experience vapor lock. The fuel pump was cooled down by dumping cold water on it. Then a small melon was cut in half and placed over the fuel pump to insulate it. The guy was able to complete the tour.
Maybe take a few small cantaloupes with you on the next drive. Check the manual, though. I think Chevrolet recommends acorn squash instead.
Last edited by Otto Skorzeny; 07/17/2022 10:35 PM.
