Grounded fuel pump + wire?
Thread Starter
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Cargo Master
Joined: Dec 2003
Posts: 2,735
Likes: 38
From: Sunny Florida
Grounded fuel pump + wire?
I am working on a 2001 Explorer and it is a no start. After checking for power at the connection to the fuel pump I have discoverred that the power supply wire appears to be grounded. When I check pin 6 for power it has none. When I checked for power I used the ground pin for got the number of that ppin and I also tried the frame as well for ground with no luck. When I check the power supply wire with a meter I can get the meter to beep when I check the power supply pin 6 to ground. I am not sure but this should not be. I should not be able to measure to ground through the power supply wire.
I have pulled the relay and it checks out fine and I still have the ground problem with the supply wire with the relay out. I checked the harness under the truck and it checks out fine but I have not yet found where the gray wire with a red stripe ends. It comes through the floor and then it looks like it goes under the console.
Am I checking this right and if so what or where could it be grounded at? Is there another sensor that could cause a grounded condition? I also check the fuel safety switch and its good.
Any help would be greatly appreciated. bob
I have pulled the relay and it checks out fine and I still have the ground problem with the supply wire with the relay out. I checked the harness under the truck and it checks out fine but I have not yet found where the gray wire with a red stripe ends. It comes through the floor and then it looks like it goes under the console.
Am I checking this right and if so what or where could it be grounded at? Is there another sensor that could cause a grounded condition? I also check the fuel safety switch and its good.
Any help would be greatly appreciated. bob
Junior User
Joined: May 2004
Posts: 67
Likes: 0
I think you are missing the +12volt. to the fuel pump.
The beep from your beeper is the ground path through the fuel pump coil. One side of the coil is grounded. The coil acts as a ground path for you beeper. If you check for resistance instead of a beep, you should see reisistance of the coil there. i don't know how many ohms for the fuel pump.
I would start trouble shooting for the missing +12 volt instead of looking for a grounded wire. If that wire is grounded you should blown a fuse.
The beep from your beeper is the ground path through the fuel pump coil. One side of the coil is grounded. The coil acts as a ground path for you beeper. If you check for resistance instead of a beep, you should see reisistance of the coil there. i don't know how many ohms for the fuel pump.
I would start trouble shooting for the missing +12 volt instead of looking for a grounded wire. If that wire is grounded you should blown a fuse.
Thread Starter
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Cargo Master
Joined: Dec 2003
Posts: 2,735
Likes: 38
From: Sunny Florida
That's a good point about the fuse. Would I still still a ground path with the fuel pump disconnected and the key off? As you can tell I am not to up with electrical stuff.
We swapped out the relay and no luck and I will check for a blown fuse.
We swapped out the relay and no luck and I will check for a blown fuse.
Junior User
Joined: May 2004
Posts: 67
Likes: 0
I can't really help you here because I have never had fuel pump problem in my Explorer. I was only suggesting that you may be beating down a wrong path. May be somebody else can help from here.
Check the fuse, relay etc. The obvious stuff first.
Check the fuse, relay etc. The obvious stuff first.
