General Technical & Electrical General technical and electrical discussion for the Ford Ranger that does not fit in any other sub-forum.

1990 ford ranger 4.0 crank no start / no power to fuel pump

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Old Nov 17, 2024
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1990 ford ranger 4.0 crank no start / no power to fuel pump

Hello I have 1990 ford ranger 4.0 auto trans

I’m getting a crank no start.
it does fire up for a second when a I squirt gas into the intake.
i checked the fuel pump connector at the pump it has ground but no 12v
I tested fuel pump Relay — pin 37/57 should have 12v (with a probe I hooked up to battery + to pin 37/57 it showed dim light meaning it’s grounding out somewhere )
I checked the inertia switch wires and I get no 12v
The fuel pump relay wires on the load side- I tested with a probe light hooked to battery positive+ to pin 22 seems to have control with key on but stays on (it should go bright for few seconds then turn off) same thing goes with pin 37/57
pin 1 is hot at all times
pin 19 goes to fuel pump should be 12v but gets grounded too
Seems to be a corroded wire or bad connector somewhere,. Have no clue
12v power to ecm seems to grounding could be a corroded wire or bad connector somewhere
 
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