[Sean Marconette]

How is the pump located in regards to the fuel cell? If the pump is cavitating that will damage it. The fluid head above the pump will reduce-eliminate cavitation. If the pump is getting mechanically damaged a restriction from the fuel cell to the inlet of the pump needs to be checked on. Is there foam still in the cell, how many and type of fittings (45,90) from the cell outlet to the pump inlet? If it is a return system, is it aerating the fuel where it is dumping back into the cell? The larger the inlet, hose and fittings are, that will reduce the chance of cavitation too. If 3 pumps have failed, have they all failed mechanically?

Most fluid pumps if damaged, it is due to a low pressure condition at the inlet of the pump which makes the fluid boil, and cavitate. When the pump has no fluid to cool it or provide a constant load or resistance that will damage it too.

Sean