Re: 1939 120 double action fuel pump .

Posted by fredkanter On 2017/2/1 13:16:23

The arm SHOULD be under the cam despite what others say.we've received 1000's of cores back and they all have the wear mark
on the top.

To test the pump put the arm in a vise and push the pump so that the arm is effectively going down, it takes a lot of force. Keep one finger over the inlet and after 10 seconds it should still hold vacuum. Finger over the outlet should still hold pressure or you could use a pressure/vacuum gauge.

Beware of those who have no clue of what they are talking about