1946 254 fuel pump

paulrhd29nz

I'm trying to figure out why the past owner of my 46 truck put on an electric fuel pump.
I finally got the windshield wippers working, so the vacuum part of the pump is working fine. 18+"

On the fuel pump side I have 6" on the inlet and 4psi on the outlet at idle. Are these readings good or bad?

Thanks, Paul

Park_W

Those figures seem about right. Was the electric pump in addition to the mechanical one? If so, the previous owner likely did what many of us have done . . . put it there mainly to fill the carburetor bowl after the car has sat for a while and fuel in the carb has all evaporated. Saves a fair bit of cranking to get fuel up to the carb. And of course if there's a failure of the mechanical pump, the electric one will get you home.

paulrhd29nz

After I posted my question I got off me arse and looking in the book, It says the vacuum should be at 12" I have 6".. My pressure is spot on at 4psi at the outlet.
I was also surprised at the books statment " Required float bowl fill time is 22 seconds of crank time at 60 rpm " So I see what you are saying Park_W.