Re: 1939 120 double action fuel pump .

Posted by Cli55er On 2017/1/31 23:42:49

pumping it by hand and pumping actual gas are two different things.

regardless...the arm is pushed up and down by a lobe on the cam and there is no way around that if you mounted it correctly on the car. so I'd say if you get no gas on the car....its time for a rebuild as the diaphragm is probably ripped.

its spring loaded so pumping it by hand wont really tell you if you have a small rip in the diaphragm.

mine had a small tear and I could only tell because the car would not accelerate past a certain mph. couldn't keep up with the carb. took it apart and it had a small tear in it.