K30/454 vapor locking.

[rjfguitar]

I am having trouble with my '81 K30 with a 454 with what I believe to be vapor lock on warmer days. In cool weather, no problem, but in 85*+ weather, it has become an issue. The truck runs fine, shut it off, start it up a few minutes later and will only run for a minute or so and wants to die, and does.

I don't see anything wrong, the truck is bone stock, newer fuel pump. Any solutions?

 

[DEMON44]

Recently started doing it? out of the blue? gradual? fuel tank vents plugged? heat shield fuel lines near exhaust pipe/manifold. run will the gas cap off for a few start/stops see what happens.

 

[thatK30guy]

I'd check into the vents first since they're free and easy.

 

[rjfguitar]

Recently started doing it? out of the blue? gradual? fuel tank vents plugged? heat shield fuel lines near exhaust pipe/manifold. run will the gas cap off for a few start/stops see what happens.

I'm embarrassed to say it's been a problem for a couple years. I don't drive the truck in the winter or summer, just spring and fall when there is only a couple days here and there warm enough to make the problem surface. I've just lived with it on those hot days and always say " I'll get to this eventually."

Also, just a little bit of starting fluid or gas down the carb and I can usually get it running again pretty quick.

I'll check on the tanks vents.