Vapor lock- additive?

[RustyRatRod]

B. Anyone saying there is one answer to vapor lock hasn't even begun to know what they are talking about.

Truer words have never been spoken.

 

[RustyRatRod]

An electric pump does fix v/lock. Modern cars use elec pumps.....& the same fuel.....& they don't get v/lock. Pump needs to be mounted near the tank.

So lets just forget modern cars also have very advanced EFI. Yeah, ok.

 

[Bewy]

Quite agree! But it is still an elec pump pushing the same fuel to the engine....

 

[RustyRatRod]

Quite agree! But it is still an elec pump pushing the same fuel to the engine....

Yup, but a carburetor is much, much different. Persnickidy is what we call it.

 

[eekvonzipper]

Quite agree! But it is still an elec pump pushing the same fuel to the engine....

Thru a Closed System

 

[RustyRatRod]

Thru a Closed System

Yup, where atmospheric pressure has MUCH less effect.

 

[Bewy]

I cured vapour lock on my 440 by removing the factory fuel pump & fitting a Carter #4594 elec pump.
VP lock is usually worse, or causes more problems, at idle & low cruise rpm. That is because the engine is using less fuel. The fuel stays in the pumped & lines longer....getting cooked by the heat.