Re: Hard starting when hot

Posted by JWL On 2011/10/11 17:34:02

To answer your question: As I understand it, the diesel (5% mixture) keeps the ethanol laced gasoline from easily vaporizing. It does not seem to affect engine performance except to greatly reduce the tendency to vapor lock. There is no tell tale diesel smoke or smell.

I ran into a bad vapor locking situation driving my '47 Clipper Custom home from a car show earlier this year in stop and go city traffic. It was a warm day with temps in the 90s. It never completely stopped running, but it was a miserable experience keeping the engine running especially after idling at red lights. I had no more vapor locking problems after adding a gallon of diesel to a tank of gasoline in the same kind of driving conditions.

I also must point out that the car has a fuel pump heat shield, an insulating gasket between the block and pump, insulating sleeves in the pump bolt holes, and insulating washers between the bolt heads and the pump body. The car also has a heat shield and insulator between the carburetor and manifold. The car is tuned correctly, and the manifold heat control valve works freely. It does not have an electric fuel pump.

I hope this helps.

(o[]o)