Forgive me Father...
My arrogance has bit me in the ass... I thought I had my aux fuel pump & sender issue isolated to the DPDT switch in the dash... Wrong!!
It's much deeper than that... This setup has worked fine for 1.5 yrs... Suddenly, on the 108* return from my last trip, I started seeing 0 psi fuel pressure on the main tank... I switched to the aux and saw 0 psi... Back to the main and back at 4 psi. Fine for a while, then repeat... Stop periodically and let it cool down... All good... Repeat...
I made it home and the next morning, 44 fired right up, on the main tank, with 4 psi... But, aux pump and sender have never activated since, via the DPDT switch.
I have spares (DPDT, Pollak Switching Valve, Carter Electric Fuel Pump, Carter Oil Pressure Safety Switch (OPSS)), so I swapped them all out... Same issue.
I started measuring voltage and found that the main pump and sender are always working with 9-11v. But, once I switch the DPDT to the aux tank, the voltage drops to < 5v... This happens consistently with the original and with the spare DPDT.
I tracked the low voltage back to the OPSS and spoke with Rudi (
@bj40green ). He suggested I eliminate (temporarily) the OPSS... Same issue.
I hooked the aux pump to my JumpBox and it fired right up.
I can't fully check the aux sender without dropping the aux tank... And I don't have time right now... So, I disconnected the aux sender ground, from the frame and cut the aux sender wire... Same problem.... Spliced it back together and reconnected the ground.
So... I apparently have a short somewhere, that may or may not be directly related to my fuel system wiring... Regardless, it's degraded the aux side of my fuel system. This all started in a very hot drive... I suspect I have melted insulation somewhere and wires shorting...
I have options... including find and fix... But, I don't have time right now... We are leaving for a couple of months and I have to get everything loaded and the truck and trailer ready to go.
So, I'll work it out when I return... Maybe it will be cooler by then.
Note: we had planned to be gone all summer (like
@mrboatman ), but the Judge scheduled the third court date for that assault that occurred next door (and the ensuing shots fired on the responding cops) for July 31... So, we decided to wait until we had testified. Now, the Judge has granted another stay and rescheduled it for Oct 31. So, thank you Judge, for helping us enjoy the record Vegas heat!!
Bye y'all!!
