Please HELP!! No power to fuel pump

[DAM_MJ88]

Any help greatly appreciated. Was driving my MJ, parked for 5 minutes. Started up ran for 3-5 seconds and died. Replaced fuel pump and relay. Still no power to fuel pump. My steering column is old and worn out 310k now going to put in my new used steering column tonight. Any thought???

[HOrnbrod]

What year/engine?? Check the power ground connection behind the left tail lamp. If good, use a wire to jumper across the white fuel pump ballast resistor on the left inner fender.

[DAM_MJ88]

88 4.0l...doesn't matter but its not a stock engine... lwb ax15 np231

I forgot about that ground at the taillight! I'll check that tonight. Thank you

[AeroNautical]

Could be a bad ballast resistor as hornbrod mentioned, or a bad fuel pump relay. My buddy had this problem, we replaced the pump to no avail on his 2.5, swapped one of my relays in place for his and it ran like butter. 

[DAM_MJ88]

New fuel pump, filter, regulator and my fuel pressure goes to 45 psi at the start then slowly drops to 20-25 psi. Won't hardley idle. Exhaust does not smell rich of fuel so I don't believe I have a stuck open injector but anything is possible I guess.... Any help appreciated

[1989 Eliminator]

I would also strongly suggest checking the ballast resistor on the driver side engine compartment by the air box. If these wires are bad or the resistor is bad then there will be minimal power or no power going to the pump.

 

Another ground would be the engine dipstick ground. Make sure that stud is tight in the block and CLEAN...

 

Your new regualtor is most likely working correctly but if you have a vacuum leak then that will cause the WRONG fuel prssure to be in the fuel rail. Check various hoses under the hood for any cracked/missing vacuum hoses.

[reubj]

^^ This ^^