Vance - Thanks for your reply. I am fairly confident that I have the wiring correct since I have the exact same setup in another car and it functions as intended but in the case of my JH when the engine is shut off the pressure settles down to about 10 psi per the gauge, and with the ignition still on this allows the pump to run. The switch triggers at either 7 or 9 psi depending on which source I found is correct. To answer your questions,
I am running 20W50 Valvoline ZR1 oil
The OP switch is an on-off signal with 3 terminals, however the NC terminal is only used during startup
The pump power is running through the switch from a switched source, not constant 12V
As you note, the pump will only run while the ignition is on AND there is sufficient pressure for the switch to close. The culprit seems to be the residual oil pressure which is why I'm questioning the normal operation. I'm currently using a NAPA Gold filter which does indicate an anti-siphon valve so this will be an easy thing to check.
CoreyLast edited on 12-06-2024 10:13 pm by JH12947
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