dgoldsmith
Veteran Member
- Joined
- Apr 8, 2003
- Location
- Olympia, WA
- TDI
- '06 Jetta sedan, "stick," with in-dash 6-CD changer, Sat., & AUX jack in glovebox that I'm no longer trying to figure out how to use, thanks to slamhouse! :-)))
After testing the lift pump in place, i.e., in the tank, with constant, direct battery power, and not getting any fuel at the fuel filter intake, I took the pump out and "table-tested" it, again with direct battery power, and got a fountain of fuel; I don't have any way to measure the pressure, but it seems like it should be enough (but I'm certainly not positive; but it wasn't zero, which is what I was expecting from the in-place test). So I went back to testing the supply of power to the pump. After confirming that all the (dash-side) fuses are intact, suspicion fell on a driver-side-below-dash relay that's been hanging loose long enough that I forget how/why it's been hanging loose. I can't figure out where it goes (surely contributing to the "why"), and it not being connected didn't noticeably affect car performance/operation, except it now dawned on me that if it's the supply to the lift pump and the tandem pump has been doing the work of the lift pump for a while... Anyway, that led me to more carefully check the voltage at the female side of the pump power supply plug. The result: when I turn the ignition to "on" (not start) I get a split-second spike of 10.7 V, then nothing. Conclusion: the dangling relay is not the (only) power pathway to the pump--the pump power supply plug is getting some voltage--but that voltage is less than the 12V I've been told the pump should be getting, and it's lasting less than a second.
Thoughts?
Thanks.
Thoughts?
Thanks.