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cwalkerjr21, Mechanic
Category: Jeep
Satisfied Customers: 710
Experience:  Shop training and hands on experience.
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Fuel pump not energizing. Replaced relay replaced pump

Customer Question

Fuel pump not energizing. Replaced relay replaced pump checked old pump. Power not getting to pump. What did i miss
Submitted: 10 months ago.
Category: Jeep
Expert:  cwalkerjr21 replied 10 months ago.

Good evening, Check the 5 volt reference from pins 17 of the A connector and 31 of the B connector of the Powertrain Control Module. If no 5v reference, unplug the sensors. The sensors that are fed the 5 volt reference are the Manifold Absolute Pressure sensor, Throttle Position Sensor , Crank Position Sensor, Cam Position Sensor, Governor Pressure Sensor and Vehicle Speed Sensor. Check the wiring for a short to ground.

Expert:  cwalkerjr21 replied 10 months ago.

Sometimes the sensors will get the 5v shorted to ground which will cause everything to not get power anymore until it is repaired. There is also a common issue with the PCM wiring and they make a repair kit. I have loaded the PCM connector view and also the TSB about the repair below.