Quote:
Originally Posted by Bob A.
Forget about dressing up your fuel line. You found the problem. IMO "Vapor lock" is caused by three things in a Model A ford with gravity feed fuel system: No vent in fuel tank-Bad coil windings-Bad condenser. This is my opinion and I'm sticking to it.
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I want to take a little closer look at why a bad vent could cause vaporlock.
Am I right that;
We all know that vapor lock is when air gets caught in the line or bowl due to "boiling" of the fuel in a hot engine compartment.
If you have a bad vent in the cap (missing or clogged) and if the gasket is old and not sealing properly you will get enough flow to keep the car running but not necessarly enough to keep the fuel line full. The engine runs, the carb sucks fuel out of the bowl and during times that the draw in minimal the fuel flows to refill the bowl.
Now if we add the heat from the engine compartment and the poor fuel amount in the line ,what is in the line is easier to be affected by the heat and cause vapor lock. Yes, no?