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Well that may rule out ground. Do check the connection from battery's to frame. Often a problem. But I think you just have too much varnish in the pump. When you cleaned the pump, did you take it as far down as this attached picture? Most folks don't know you can screw item #11 out. Or that when...

I guess I don't view the original equipment pumps as reliable. My set came with two... one one dead when i bought it, the other caused my set to stall out a couple times last time I needed it for power. To get it going again I needed to take a wrench and tap on it in order for it start pumping...

Also, have you checked the pump output? 3 gallons in ten min.

Why fool with something that works. The life of such a pump, is incredibly long. And you probably will never use your set long enough to exceed the running life of the pump. Get a new pump. Get the right pump. This gen set is one of only a few I would stake my life on. It just runs for ever...

Changing out the AUX pump, is something I would only do in desperation. Its a PITA. Or maybe if I was locked up someplace, and about ready to loose my mind.

This is all there is.

This would be good for the AUX fuel pump! In a pinch, we sometimes did that. Installed one that did not flow through, and took the good one we removed from the AUX position, and installed it as one of the other two pumps that had gone bad.

If it works, don't fool with it. KISS.

I beg to differ. All three electric ful pumps are the same. There has of course, been a number of pumps bought by the milatary over the years, and some do have different part #'s, but they are all compatible. Also, there are a number of pumps that LOOK just like the "Right" pump, but are not...

Sadly, because the pumps all have FACET printed on the front, people think they are all the same.