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post #1 of (permalink) Old 04-11-2003, 03:48 PM
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I know this is not a JEEP question?

Alright guys I have a 1990 Ford F-150 its got the inline 6 cyl. the 4.9ltr. What happen is I was putting my startor in and the I dindn't disconnect the battery like I should have and the HOT wire grounded out. I later went to start it and nothin. I noticed that when I turned the key to the on postion I didn't hear the fuel pump do it's intial presureizing sound. The first thing I tried was replacing the fuses in the fuse box and the fuel pump relay. That didn't do anything. Yesterday I read about the interia switch and thought that could be the problem so today I went and bought one at the dealer and still nothing. Reading my Haynes manuel I don't see any other curcuits that it could be. The way I read it is power goes from the ignition to the relay box to the dual tank switch then to the pump premoter then to the PCM. Once power is at the PCM it then goes through the interia switch to the Fuel Pumps. Is this how it goes or do I have something mixed up? Also is there anything that I have majorally over looked? Any advice would be greatly appreciated. Thanx a million.


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post #2 of (permalink) Old 04-11-2003, 04:09 PM
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Re: I know this is not a JEEP question?

the HOT wire is only hot when your turning the key to teh start position right?

maybe you burned a fusable link up, its a short section of the battery wire thats designed to burn and open the circuit in teh event of massive current ( dead short)

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post #3 of (permalink) Old 04-12-2003, 06:27 PM
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Re: I know this is not a JEEP question?

I did check the fusable links and I they are O.K.. I also went out and bought a code reader and ran the test and it came back with a 95 that siphered out to be Fuel Pump Circuit failure-PCM to GRD in my Haynes manuel. Well I know the problem is in the fuel pump circuit but I don't know what the PCM to ground means.

Thanx for all the insight fellows.
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post #4 of (permalink) Old 04-12-2003, 06:56 PM
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Re: I know this is not a JEEP question?

1. Run a wire from the negative battery cable,
2. To the cab...
3. Try it out...
4. I'm thinking that a ground wire's opened....
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