power to fuel pump
Asked by fuckoff Apr 05, 2012 at 01:25 PM about the 2002 Dodge RAM 1500 SLT Quad Cab 4WD
Question type: Maintenance & Repair
How do I test the connection at fuel pump to make sure there is power. I can reach it and discoonect it. Have allready replaced pump but no fuel pressure. New plugs, wires, fuse and relay. Need to know if there is a problem there before I replace the pump again.
9 Answers
Use a test light with key on to check power if no power there has to be a fuse in system. If not hook power up straight from a battery to check pump. Then to make easy fix make separate power to pump with a toggle switch...
test lights are a pain, get a multi meter and use that, much easier to fit into the small connections on the fuel pump plug, check your fuse again, make sure it didnt blow, if it blew then theres high resistance in the circuit some where, signalling either a positive short to ground, or a ground shorting to the power side of the circuit. or at a long shot the pump you have is defective, if its new it prolly has some kinda warranty on it, id try bringing the pump back before i do any thing, with china getting there hands on every thing and building it as cheaply as possible, more and more NEW parts are coming from parts stores defective.
Or the spoons for the wires...
Don't forget that w/o a tach signal the PCM shuts off the fuel pump in 5 seconds. You'll need an assistant to turn the key on while you hold the meter connections to get a reading.
I have the same problem with my 2002 dodge ram 1500 cargo van. I replaced the fuel pump and it wouldn't cut on. Running a wire from my battery to to fuel pump turned the fuel pump on but the van still will not start. Any suggestions
ok same problem here 2002 ram, 4.7 auto tranny, pump won't turn on at initial key on... checked all circuits and found the pcm is not supplying a negative to the pump module. No engine codes so it looks like a bad PCM
Intrigue_2969 answered 7 years ago
My low fuel light wires where put on the low level for the low fuel light. The green and the black & white wires where on. Fuel tank gauge. Variable resistor, that works backwords i turned a corner and shorted my pcm. Out hope its my problem but. Must be more. ?
I'm having same problem with my 2002 ram 1500 new pump curses and relays are good I even took old pump and wired to battery and works why am I not getting power to fuel pump my gas gage even works?
I have a 2008 dodge ram 1500 5.7 hemi and I want to no how can I get power to my fuel pump to see if it's gone out
