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The Silver Gorilla 06-06-2013 12:39 AM

Fuel rail problem. and pressure problem.
Not getting pressure in my fuel rail after replacing my fuel pump, cant hear the pump hum and its brand new. And advice? iv been working for days on the shizzit:confused::confused:

The Silver Gorilla 06-06-2013 12:29 PM

Still no pressure in fuel rail and i cant get my fuel pump to kick on.... and advice guys, I'm out of ideas...

Garyk 06-06-2013 03:01 PM

Are you getting 12 volts to the connector at the tank? How is the ground? A lot of complaints here about no fuel pump turn out to be bad ground.

The Silver Gorilla 06-06-2013 03:11 PM

Reconnected the ground wire in the engine bay, sanded it and everything, cant find one by my parking break. I tryed testing the pump with a small car battery with the positive end and it didnt hum so im still lost. How do i test iv im getting 12v to the connector? As of right now i have my tank dropped and the fuel pump assembly out too.

flcracker 06-06-2013 04:17 PM

Not to sound contrite but you say you tried another battery with the positive end?? Did you also run the ground to the new battery as well to complete the circuit??

The Silver Gorilla 06-06-2013 09:00 PM

Yes a separate battery, and no i did not, i heard that it was not necessary.

bubbadah 06-06-2013 09:02 PM

There is also a fuel pressure regulator on the rail. Also, I can't hear my fuel pump run and it works now. I guess my question would be do you have pressure at the filter?

The Silver Gorilla 06-06-2013 09:04 PM

No pressure at the filter. I dont think my fuel pump is kicking on, i used to be able to hear it.

bubbadah 06-06-2013 09:06 PM

What year is your Jeep ? Mine is a 91 and the ground wire was mounted at the dash on the mounting bolt on the dash. I feel you on this one, it took me a month to figure out I had accidentally disconnected the ground wire. I am getting to be an expert on that damn 4.0

The Silver Gorilla 06-06-2013 09:07 PM

A 95 I6 4.0 Sahara. i found a ground in the engine bay next to the battery so idk if there is one on the parking break.

flcracker 06-06-2013 09:13 PM


Originally Posted by The Silver Gorilla (Post 3834071)
Yes a separate battery, and no i did not, i heard that it was not necessary.

If you were to hook a light bulb to the positive on one battery and the negative of another, it will not work and that is effectively what gou are doing to test your new pump. If you want to test the pump, it needs to be grounded to the same battery to complete the circuit...

Redrider94 06-06-2013 09:14 PM

If you just ran a positive wire from different battery, and you didn't run a negative wire from the same battery the fuel pump will not work. You need to run both positive and negative from the same battery in order for it to work.

The Silver Gorilla 06-07-2013 01:35 AM

Will doing this create a spark? I am dealing with a lot of gas.

flcracker 06-07-2013 03:54 PM


Originally Posted by The Silver Gorilla (Post 3834840)
Will doing this create a spark? I am dealing with a lot of gas.

IF you are worried about sparks setting off gas fumes, run 5' of wire to the battery set 5' feet away (or whatever distance you feel is safe) and do it outside. Get a good connection down in the plug and then attach or make contact with the battery so any sparks will be well away from anything flammable and you can remove power as soon as you hear the pump come on.

tim2 06-08-2013 03:53 AM

Why don't you jump the fuel pump relay and listen for the pump to start running?

The Silver Gorilla 06-08-2013 09:58 PM

Does the pump need to be in the fuel or can i test it dry?

tim2 06-09-2013 02:04 AM

You can test it dry, just don't run it very long.

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