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1987 - 1996 F150 & Larger F-Series Trucks 1987 - 1996 Ford F-150, F-250, F-350 and larger pickups - including the 1997 heavy-duty F250/F350+ trucks

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  #1  
Old 04-04-2008, 09:10 PM
sirgrantalot sirgrantalot is offline
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Fuel pump won't shut off, relay chattering

This is my first post, although I've been browsing and searching this great forum for some time.

I bought my '90 F250 351 4wd E4OD 2 weeks ago for 500 bucks. It ran fine for the first few days, the check engine light was on, but no problems.

Then it began. It would start fine, idle fine, no check engine light. But when I put it in gear and go, it would either sputter and stall right there, or wait maybe 30 seconds and sputter and all but stall, check engine light coming on with the sputtering. I barely got it started and back into the driveway. I replaced the fuel filter, and this seemed to fix the problem, the CEL would come on after a few minutes of driving, but there was no change in driveablity.

This lasted for a whole day. The the problem came back, and I noticed that when I turned on the key, the fuel pump would come on, but not go off (no prime for like 2 seconds). After I let it sit for a couple of days, I tried it again. It went away again, the pump would prime for 2 secs and all was well. Then it came back. I found the negative cable from the battery that is bolted to the engine was nearly gone ( hanging by a thread), so I fixed that. It seemed to remedy the problem. But now, week later, and the problem is back with a vengence. Now the fuel pump relay is chattering, along with assorted other relays around the coil, the pump doesn't turn off, and the truck wont even start.

Sorry about writing you guys a novel for my first post, but I figured you needed all the info I had.

Anyone have ideas about whats going on? Seems like its definately electrical, I haven't had much time to work on it yet..

Grant
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  #2  
Old 04-05-2008, 11:14 AM
DJdemon6696 DJdemon6696 is offline
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normally a running fuel pump is a bad ECU .. i had that problem a while i ago a new ECU fixed my problem.. maybe wanna chek try it.. borrow one from a friend or something and just chek it if it fixs your problem then you know..

btw.. i have the same truck.. 90' 351w 4x4 E4OD
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Old 04-05-2008, 01:25 PM
sirgrantalot sirgrantalot is offline
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hey thanks for the reply, a friend has a '92 with a 351 but a manual tranny, would the ECU work to check this?
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Old 04-05-2008, 01:26 PM
DJdemon6696 DJdemon6696 is offline
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ehmm.. i think it would do but not for driving only for starting and idle.. the E4OD is a computer controlled tranny and you will have to find a ECU that is ment to be used with the E4OD tranny
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Old 04-05-2008, 01:30 PM
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try replacing the relay.

if that fixes it good.

if not the ecu is bad.
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Old 04-05-2008, 01:31 PM
sirgrantalot sirgrantalot is offline
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that makes sense. that reminds me that when having this problem earlier (when it would actually run) it felt like it was starting out in 2nd, thus the possibilty of the ecu being bad.
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Old 04-05-2008, 01:32 PM
sirgrantalot sirgrantalot is offline
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the relay as in the pump relay or the ecu relay?
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Old 04-05-2008, 01:32 PM
DJdemon6696 DJdemon6696 is offline
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yep it would cuase tranny problems also when my ECUw as bad my overdrive bottom came on and off when i press the brake :S

fuel pump relay mostly
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Old 04-05-2008, 10:12 PM
sirgrantalot sirgrantalot is offline
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I put in a new pump relay, no change. what would be a good source for an ecu, or .....any other things i should check first?
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Old 04-05-2008, 10:43 PM
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junkyard for used.

napa for new.
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Old 04-06-2008, 09:52 PM
sirgrantalot sirgrantalot is offline
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what years would be compatible? did the f150 come with an E4od? if so would an ecu from one with a 351/E4OD work?
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Old 04-06-2008, 10:01 PM
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Just for kicks, I would disconnect the neg. battery cable, then disconnect and inspect the ecu cable connections for corrosion, moisture, etc. Only risk is a little time. If you replace the ecu, be sure to pack the connector with silicone grease to keep out the moisture.
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Old 04-06-2008, 10:04 PM
sirgrantalot sirgrantalot is offline
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where is the ECU? is it under the dash?
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Old 04-06-2008, 10:07 PM
DJdemon6696 DJdemon6696 is offline
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behind the drivers side kickpanel you can fit any E or F series vehicle just make shure its ment to be used with an 351/e4od .. mine is from an E series van..an ambulance ( lucky me ).. and its working fine.
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  #15  
Old 04-06-2008, 10:22 PM
sirgrantalot sirgrantalot is offline
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hey thanks for the help! i'll try and track one down
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Old 04-06-2008, 10:22 PM
 
 
 
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