fuel pump relay chatter 2nd question
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From: laredo
fuel pump relay chatter 2nd question
1991 f-150 5.8
on my last post i was told to ground the wire at the test plug to see if the chattering of the relay would stop. i did this and the relay stopped chattering. is this a permanent fix. do i leave it grounded or do i have to look for a ground at the EEC. if so where is the computer located or does someone have a diagram that would help me out. thanks. john
on my last post i was told to ground the wire at the test plug to see if the chattering of the relay would stop. i did this and the relay stopped chattering. is this a permanent fix. do i leave it grounded or do i have to look for a ground at the EEC. if so where is the computer located or does someone have a diagram that would help me out. thanks. john
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From: Easton,Ks
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From: laredo
thanks a lot subford for your input and the diagram. from the looks of it power to the fuel pump relay comes from the EEC power relay. i will replace the power relay just in case that it is causing the problem of the chatter. thanks again. john
Last edited by JOHNJAY28; Sep 24, 2006 at 11:35 AM.
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From: Easton,Ks
One other though is to make sure that the small wire (black with a white stripe) coming off the Neg Post of the Battery has a good connection as this is the ground that the EEC uses to ground the Fuel Pump Relay.
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From: laredo
i will have to wait to try your suggestions tomorrow as it is raining today. hopefully this will work. i'll post as soon as i get a chance to check them out. thanks, john
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From: laredo
i tried restarting the motor and when i turned on the ignition the fuel pump ran constantly and the motor would not start. i grounded the fuel pump relay and the chattering was still there. i ran a code check and a code 15 came up on the scanner which is related to the computer memory. after running the scanner the moter would start for about 8 times then it would go back to the chattering and no start also the tad and tab relays were also chattering. i guess that the computer is at fault. if you think that that the grounds 40 and 60 are in question let me know. i think that the computer is under the radio mid dash area. i was told that it was located on the left kick panel but all of the wires lead to the mid councel area. any help will be appreciated. thanks again. john
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