ELectrical Issue

[mike_23us]

1991 2.3L Ranger 2wd-----okay im totally confused im not getting any power down to my fuel pump the wirings good i checked the interia switch and its good and i also checked the relay its good i ran a jumper wire within the relay connection and i get the pump to run the pressures only 22psi i got a new pump and put it in now i got 40psi but still all the engine will do is crank crank and crank . iv put a new fuel filter on so thats not the problem and iv got spark im completly stumped please help
mike

[stuzman]

Originally Posted by mike_23us

1991 2.3L Ranger 2wd-----okay im totally confused im not getting any power down to my fuel pump the wirings good i checked the interia switch and its good and i also checked the relay its good i ran a jumper wire within the relay connection and i get the pump to run the pressures only 22psi i got a new pump and put it in now i got 40psi but still all the engine will do is crank crank and crank . iv put a new fuel filter on so thats not the problem and iv got spark im completly stumped please help
mike

This info is for a 94 Ranger, but it should still apply for your vehicle. Can you hear the fuel pump run for a second or two with the ignition switch turned to the ON position. If not, here are some other things to check. Did you check to ensure that the relay will pull in momentarily when the ignition is ON? Feeling the relay or using a meter should verify this. If the relay does not pull in, then you have a problem in the circuit which operates the coil or the coil is defective. Possibilities include missing 12V from the EEC power relay which provides 12V to the Inertia Fuel Shutoff (IFS) switch which then supplies voltage to the coil. If you have the 12V at the coil, then you have a problem with the ECM not grounding the coil to pull in the fuel pump relay.

If the relay pulls in momentarily, then check the contact side of the fuel pump relay. One side of the relay contact is fed by battery power which goes through a fusible link. This link is attached to the starter solenoid (battery side). Your vehicle may have a fuel pump fuse instead, so you may want to investigate that possiblility. So, if you don't have the 12V then check the link or fuse. Also, downstream on the other side of the relay contact, the 12V is supplied to the fuel pump. However, another contact from the IFS is wired in series in this line.

Hopefully, this should give you a starting point. If you saw a wiring diagram, I'm sure that a lot of the above mumbo jumbo would be clearer.