The Stovebolt Site Forums The Shop Area Engine Shop Fuel Pump Cam Wiped?

How will I know if the screwdriver is moving the requisite amount? I assume that even if the lobe is worn sufficiently enough to cause the pump not to work properly, it would still have enough eccentricity to seesaw the screwdriver up and down.

I've had crap Airtex fuel pumps fail when practically new for both my '79 Ford pickup and my '56 Cadillac. In the case of the Cadillac, the check valves, which are supposed to be staked at the factory, are not. I took apart a couple of Cadillac pumps and staked the valves in place and they now function perfectly.

It might be the same situation with these pumps but I'd still expect to see a little bit of fuel squirt from the outlet. This also does not explain why the glass bowl pump doesn't squirt out a drop even though it will produce suction when worked manually in your hand.

I'm really hoping the problem is in the pump(s) and not the camshaft but the preponderance of evidence thus far is pointing toward the cam.

I think I will disassemble the Carquest pump that was working and then stopped working and see if the check valves have popped out of their seats.

Here is the Cadillac pump with the valve staked after it jumped out of its seat. I was able to perform the surgery with the pump in situ. The last picture shows what I found when I opened up the pump. Valve laying on the diaphragm.