latinmustang90

I got a 90 mustang gt with automatic and my problem is that I dont get enough power to the fuel pump I replace the fuel pump but still not working I replace all the relays on the car and nothing can please some one help me thanks!

PRO50SC

You need to get your hands on a wiring diagram, test light and a DVOM.

mjr46

you need a wiring diagram of the fuel pump circuit and test all the power and ground points in the system

93hatch306

Has the inertia switch for the pump been tripped somehow? Reset the switch. Also, you can check the pump by the diagnostic plug. Ground the FP lead(far right lead on the test plug) and turn the ignition on, the pump should run. Hope this helps.

latinmustang90

I tested the fuel pump wires and connectors and I did used a 12v light on the connector of the pump every time I open the ignition switch ligths up but you barely see the light on mmmmmhhh weird I test the pump directly to the battery and seems to be working well but not when I plug it to the connector it wont do nothing !

306stang

There is a button in your hatch near where the wires for the tail lights pop through the metal. You probably hit that button which disables your fuel pump.

I learned about this switch the hard way....

mjr46

if it barely lights up you may have voltage drop occuring, first thing I'd do is see what the availible voltage at the connector is?? should be 12.0-12.6 volts with a good battery....if not the connector or ground may be bad or bad contacts in the relay that is under the driver seat

mjr46

you can use a dvom set to volts to see what availible voltage is at connector

latinmustang90

I went under the driver seat and I pull the relay out and I went to buy a new one when I pull the connector out I did find one of the wires of the connector cut out I replace it now it runs but when I step on the gas kinda rattles and my check engine comes on but other the that thanks for the tips apreciate all the info thank you!!