73-87 Chevy _ GMC Trucks > Engine/Drivetrain

Carburetor

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JohnnyPopper:
Think this through with me.

It was good for two years, what changed?

Physically VL occurs when liquid gasoline changes it's nature to a gaseous state.

Your fuel pump can't pump gaseous gasoline. Only liquid.

The only things that makes it change state is heat, lots of it.

Find out where heat  is coming into contact with your fuel delivery system, metal and rubber lines, fuel pump, etc.

My money is on an exhaust leak.

Is there a reputable muffler shop that can find it for you?

Big Dee:
If your truck didn't have a return line then so be it.
a good mechanical fuel pump is the way to go.
check the vent line by blowing air through it, both ends.
charcoal canisters don't last forever.
 ;)

peewee0413:
DEI has tons of heat shielding available. Very good at keeping vapor lock down, as well as protecting things you don't want burnt.

Sent from my SM-S908U using Tapatalk

Cheyenne1010:
My exhaust manifold was heating up the fuel line,so what I did was add a fuel return line and im happy to say no more vapor lock.with the return line fuel doesn't stay in the line long enough to heat up.

JohnnyPopper:
Good to hear! Thanks for the update  ;)

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