Fuel Pump problems

Tiny
KEVMIESTER3
  • FORD F-250

The truck is a 1990 Ford F-250, it has the 460 motor and dual fuel tanks. The truck ran great before it was parked, I went out to start and move the truck. Well the fuel pumps don't kick on(neither one). There is no power getting to the fuel pumps. I have replaced the fuel pump relay also. What could this be? I don't think it is the fuel pump because again it has dual tanks and I don't feel that both of them would have went out at the same time while not even driving the truck. All and any of your help is much appreciated, thanks for your time.

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Sunday, March 4th, 2007 AT 9:06 AM

21 Replies

Tiny
RASMATAZ
  • MEMBER

Have you tried the inertia switch

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Sunday, March 4th, 2007 AT 9:21 PM
Tiny
BHUGG
  • MEMBER

You mentioed that you replaced the fuse. I hope that you also checked out the fuses both in the dash and under the hood.

Good luck.

Let the forum know what happens. We like feedback.

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Sunday, March 4th, 2007 AT 11:52 PM
Tiny
KEVMIESTER3
  • MEMBER

Yes I have checked the inertia switch, where are the fuses located at under the hood, I see where the relays are and I thought that the fuses were supposed to be in the same place.

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Monday, March 5th, 2007 AT 3:52 PM
Tiny
RASMATAZ
  • MEMBER

Do you have power going to the F/P relay and Inertia switch-

You need the owners manual to find the fuel pump fuse or call the dealer to help out.

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Monday, March 5th, 2007 AT 4:07 PM
Tiny
MERLIN2021
  • EXPERT
  • 17,570 POSTS

Did you have any custom work on this truck, Running boards or anything? I have seen drill holes into wire, fuel lines etc. Check the ground!

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Monday, March 5th, 2007 AT 5:55 PM
Tiny
BHUGG
  • MEMBER

As for the fuses under the hood, I would think that they would be in the same box too.

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Tuesday, March 6th, 2007 AT 12:13 AM
Tiny
KEVMIESTER3
  • MEMBER

Ok, I have not had any custom work done to the truck since it has stopped working. I am getting power to the fp relay but NOT the inertia switch, I also cannot find the fuses under the hood, the haynes manual shows that they are located in the same box as the relays, but the relays are in a rectangle thing and they are the only thing located there. Since there is power getting to the relay but not the inertia switch, where does the problem have to be, I believe that mice could have chewed through a wire, but is there any way to track this down? There was a mouse nest on the engine, and it looked to be made out of the casing that goes around several wires. Also in which position is the inertia switch supposed to be in? Up or down, im guessing down, which is where I put it

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Thursday, March 8th, 2007 AT 5:54 PM
Tiny
FORDTECH1
  • MEMBER

There are no fuses under the hood on the 90 model. You may need to double check the power to the relay. I'll try to make this simple- unplug the relay and see if there is power on one of the two large spade terminals. If there is install a jumper wire between the two LARGE spade terminals. One of the fuel pumps should run (key off or on doesn't matter) It may be the selector switch in the dash. Let me know

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Thursday, March 8th, 2007 AT 7:39 PM
Tiny
KEVMIESTER3
  • MEMBER

One of the fuel pumps kicked on when I jumped the spades like you said. What should I do now?

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Friday, March 9th, 2007 AT 4:06 PM
Tiny
FORDTECH1
  • MEMBER

With that test you made sure that the fuse link, inertia switch, selector tank switch and fuel pump are good. So now we have to find out wihy the ecm is not energizing the relay. Check the computer grounds, they come right off the negative battery cable into the body wiring harness by the battery.

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Saturday, March 10th, 2007 AT 10:47 AM
Tiny
KEVMIESTER3
  • MEMBER

Ok, so I really don't know what I am doing now, how do I check if a ground is good or not? Am I just supposed to look and see if the wire is not connected to a ground, if its split or is there actually a way to test the wire itself

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Saturday, March 10th, 2007 AT 12:08 PM
Tiny
FORDTECH1
  • MEMBER

Check and see if there is any corrosion right where the wire or wires go into the battery cable end. I think about 6 to 9 inches from the cable end might be a connector or two. Unplug them and look for corrosion or damage. If the is any doubt I would cut off the wires at the cable end and connector end (to get rid of the connector) and run new wires and attach them to the bolt on the negative battery cable end.

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Saturday, March 10th, 2007 AT 12:17 PM
Tiny
KEVMIESTER3
  • MEMBER

There are no connectors at the end of the cable, there is a seperate wire that comes off the the big one, it leads to a place on the body, there is a bolt sticking out of this, there are 2 other grounds connected to this one, these 2 wires run into the wiring harness( I think) the nut on the bolt looks really rusty and the part on the body where the connectors touch is kind of rusty, are these the ones you were talking about or am I crazy lol
the ground goes from the battery straight to the frame I think, this wire I am talking about comes right out of terminal connector.

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Saturday, March 10th, 2007 AT 1:57 PM
Tiny
FORDTECH1
  • MEMBER

I'm sorry I did mean at the terminal that hooks to the battery post, go ahead and clean those connections that the small wire goes to and any other grounds you can see. This may be the last step we can do without having a tech look at it for you. Least you know what you don't need. One more thing we can check is there should be 12v power to one of the small spade terminals at the fuel pump relay connector with key on. If there is no power to one of the terminal It could be a bad EEC relay because that where the power comes form. You can jumper across the two large spade terminals at the EEC relay like you did on the fuel pump relay connector and the truck should start if the problem is there.

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Saturday, March 10th, 2007 AT 2:23 PM
Tiny
KEVMIESTER3
  • MEMBER

Is there a SAFE way that I can run a jumper wire from a hot wire or something to get the fuel pumps working until I can figure out the problem later on?

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Saturday, March 10th, 2007 AT 2:38 PM
Tiny
FORDTECH1
  • MEMBER

Did you do all of the checks in my last post. Did the truck start we you had the fuel pumps running. The EEC relay is right beside the fuel pump relay.

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Saturday, March 10th, 2007 AT 2:44 PM
Tiny
KEVMIESTER3
  • MEMBER

In the last post you said to clean all the grounds, which I had done previously because of your post I figured that I had the right grounds, well the truck didnt start when I had the fuel pumps running, but it did drain the heck out of the battery when I turned it over, I think I will try to jump the battery and see if it starts, it could be flooded from the pump running for that long of time I guess?

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Saturday, March 10th, 2007 AT 2:50 PM
Tiny
FORDTECH1
  • MEMBER

Did you jumper the EEC relay. I did add some more info in my last post that you may no have seen

I'm sorry I did mean at the terminal that hooks to the battery post, go ahead and clean those connections that the small wire goes to and any other grounds you can see. This may be the last step we can do without having a tech look at it for you. Least you know what you don't need. One more thing we can check is there should be 12v power to one of the small spade terminals at the fuel pump relay connector with key on. If there is no power to one of the terminal It could be a bad EEC relay because that where the power comes form. You can jumper across the two large spade terminals at the EEC relay like you did on the fuel pump relay connector and the truck should start if the problem is there.

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Saturday, March 10th, 2007 AT 3:18 PM
Tiny
KEVMIESTER3
  • MEMBER

Jumping the eec made the truck run! There was 12 volts at the fuel pump relay spades, but when I ran the wire across the eec it worked fine. So do I need an eec relay?

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Saturday, March 10th, 2007 AT 4:30 PM
Tiny
KEVMIESTER3
  • MEMBER

Woohoo, thank you so much fordtech1, it was the eec relay, I called autozone and they said that that part number matched their fuel pump relay, which I had purchased previously, well I plugged back in the old fuel pump relay and put the new one on the eec and well, the truck started right up, turn the key and you can here the pumps run for a second or two, thanks a lot!

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Saturday, March 10th, 2007 AT 6:07 PM

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