For those interested, here is a link to how a pump works. (note the missing teeth on the gear): https://www.motorauthority.com/news/1111173_this-is-how-your-fuel-pump-works
Generally speaking, electric fuel pumps rely on the fuel to keep them cool and lubricated. Any air entering them can cause the vanes to crack or shatter. I would start with a complete test of the pump, meaning flow rate and pressure, not just a press...
@wingless My Tractor Mower had the same issue (fully potted) so I stuck it in the convection oven at 120 ℉ for 1 Hr. I'll have to obtain one of them and examine it. Always a way if there is enough need...
@wingless That one is easy, they all have airspace internally to provide cooling. If it was fully potted it would weigh 5 pounds.We run a Reverse Engineering Lab and are hired to acquire and dismantle just about anything. We use a 3D RF imaging array...
