Re: Questions about my "New" 37 120

Posted by JWL On 2017/10/19 10:40:26

cli55er, You may be correct, but I have a different opinion on the vapor locking problem.

I doubt it is the fuel line between the pump and carburetor where the vapor locking is taking place. This line is pressurized. This is a common misconception that goes back to the earlier days of the automobile when fuel was delivered to the carb by gravity. The fuel is most likely vaporizing in the carburetor where it is not under pressure and/or on the intake or suction side of the fuel pump.

Insulating the fuel pump from the engine can help prevent vapor locking. This can be done with a thicker gasket and insulating sleeves and washers.

An electric fuel pump mounted close to the gas tank and in parallel with the mechanical pump can overcome vapor locking. It can help to prime the system for starting after the car has been sitting for some time.

I hope this helps.

JWL

Edit: a sheet metal shield around the fuel pump will help keep off some heat from the exhaust manifold.