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

So your thought is that the pump that quit working and the new one that was just installed are so poorly made that neither will work at all?

I know what you mean about quality control at the slave labor factories of Red China but I'd expect the new pump to at least pump a little or work for a short time.

Comparing both Carquest pumps to the original glass bowl pump indicates that the pump arms extend slightly different lengths.

The distance from the mating surface of the pump body to the tip of the mating surface of the arm, is as follows.

Glass Bowl Original: 1 7/16"
"Failed" Carquest: 1 17/32"
New Carquest: 1 5/16"

Obviously all three pumps are quite different from each other in how far the tip of the arm extends when relaxed. The new one is shorter by 1/8" compared to the original. The pump that supposedly failed, however, has an arm that extends 3/32" further than the original glass bowl pump. That makes it unlikely that the arm reach is too short to contact the cam properly.

The wear pattern on the "failed" pump looks like it was barely contacting the cam - as if it were riding on the very edge. There's no way the camshaft can move out of position, is there?