1951 Ford - Not vapor lock- but something going on

[mustang8]

Originally Posted by tjc1965

I'd do that, but I'm concerned about damaging the existing working mechanical pump by feeding it 4-5 psi all the time. Or worse, causing an issue at the carb by making the feed pressure downstream of the mechanical pump higher ( electric pump + mechanical pump = 8-9 psi?) Or maybe I'm overthinking it?

Just remove the mechanical pump. They make a nice little aluminum cover that closes off the opening on top of the engine. As long as it is a low pressure pump like 2-3 psi area you should be fine.