Fuel pump relay location
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The fuel pump will work when power is applied via jumper wires. Are you talking about the safety shutoff switch behind the passenger kick panel? If so, it appears to be in the normal run position as it appears to be pushed in all the way.
Cargo Master
Joined: Feb 2011
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From: Forest lake minnesota
Yes thats what Brent is talking about, There seams to be conflicting reports on this mysterious fuel pump relay as it seems so have it and some dont. I suppose it depends on the year..
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I checked power at the shut off switch. I am reading about 7 volts on the green wire with yellow stripe ( feed from PCM according to the wiring diagram that I got from a friend ) when the key is turn on. Should I have 12 volts? Also, if I unplug the shut off switch and put 12 volts to the pink and black wire , the pump runs and the truck starts and runs fine until I remove the power. Bad PCM maybe?
Post Fiend
Joined: Mar 2009
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From: Mt. Shasta California
I checked power at the shut off switch. I am reading about 7 volts on the green wire with yellow stripe ( feed from PCM according to the wiring diagram that I got from a friend ) when the key is turn on. Should I have 12 volts? Also, if I unplug the shut off switch and put 12 volts to the pink and black wire , the pump runs and the truck starts and runs fine until I remove the power. Bad PCM maybe?
Cargo Master
Joined: Feb 2011
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From: Forest lake minnesota
It is confusing, everything doesn't get 12v like in the old days, now the PCM can command whatever voltage it wants..
New User
Joined: Jan 2007
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Rick, Im having the exact same symptoms. Did you ever find the fix?
I pulled the cjb, and pulled it apart. there is a small relay that looks a little melted so Im assuming thats my cause. I havent replaced it yet so im not 100% sure yet.
**** poor design to have a normally cheap relay permanently attached to an expensive cjb. I guess no one knows of a way to jump past the cjb and install a relay like the pre 02 design?
I pulled the cjb, and pulled it apart. there is a small relay that looks a little melted so Im assuming thats my cause. I havent replaced it yet so im not 100% sure yet.
**** poor design to have a normally cheap relay permanently attached to an expensive cjb. I guess no one knows of a way to jump past the cjb and install a relay like the pre 02 design?
Hotshot
Joined: Jan 2004
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From: St Louis
Yeah, it's been done. We covered it in depth in one of these sections a few years ago.
Post Fiend
Joined: Mar 2009
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From: Mt. Shasta California
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New User
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I've been searching for the thread all morning but can't seem to find it.
I've seen threads Where it was mentioned, but no "how to" threads.
It shouldn't be that difficult to do if you find the right wires and use the right relay. 2 very big ifs.
I'm just scared of doing it wrong and frying a pump or EEC or worse.
May just say screw it and get a cjb from the junk yard. Does anyone know if the 2002-05's are interchangeable?
Thanks for the help
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With the ignition switch turned on, I can pull and replace the fuel pump fuse and cannot hear anything clicking in the cjb nor will the pump run. I don't know what else to do.RICK
Post Fiend
Joined: Mar 2009
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From: Mt. Shasta California
You have to have someone else pull the fuse while your ear is on the filler tube, it might only run for 3 seconds. What is cbj?
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How can I tell if the relay is working? I hate the idea of going to the dealer.
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