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rpmdiag, Tech and Instructor
Category: Chevy
Satisfied Customers: 7768
Experience:  Since 1975
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How do I prevent vapor lock on my 1950 Pontiac, Silver

Customer Question

How do I prevent vapor lock on my 1950 Pontiac
JA: What is the model of your '50 Chevy?
Customer: Silver streak
JA: Are you hoping to fix this yourself? What have you tried so far?
Customer: Yes, I insulated the metal fuel line and bypassed the mechanical fuel pump with an electric pump and I add 1 pink diesel fuel to. 10 gals of gas
JA: When did you last fill the tank? And do you smell gasoline around the engine?
Customer: I fill the tank every weekend and I don't smell gas anymore after putting in a carburetor kit
JA: Anything else you think the mechanic should know?
Customer: It vapor locks after being left park for half an hour and clears after 2 hours left parking
Submitted: 11 months ago.
Category: Chevy
Expert:  rpmdiag replied 11 months ago.

Hi, welcome to Just Answer. I’m Ron and I’ll be helping you
Before we get started though, Please understand that I don't know
your skill level or tools you have to assist us. Also understand that
I can't see, smell, hear, or touch the vehicle either, so patience is
appreciated. JA is a great Q/A site, but it does NOT replace a
repair shop.
My goal is to make you happy and get a great rating in return for
my time. Sometimes I have to give you bad news that I know you
didn’t want to hear, so please don’t shoot the messenger.

Vapor lock happens when fuel boils which is right at 100 degrees. The carb is to old to have a hot idle compensator, so you need to vent it good somewhere like at the bowl. Vapor lock never happens on newer cars with high pressure pumps because the fuel is moving to fast and doesn't have an opportunity to sit an boil. Another goofy way that I saw to prevent vapor lock, and it did work but looks stupid, was to put clothes line wood clips on the fuel line so the heat would get dissipated to the wood. It worked too.

Thanks, Ron