1951 Ford - Not vapor lock- but something going on

[Dick Webber]

On my 49 Mercury I run a 6 volt electric pump just forward of the tank for priming the carburetor. Car takes extended cranking after sitting a week without the pump. It is on a toggle switch that I turn on for 20 seconds or so before using starter. Then I switch it off. Has worked great for 15 years. It has also helped a few times when I thought it was going to vapor lock