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Engine control fuse blowing

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Old 04-26-2014, 03:53 PM
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Engine control fuse blowing

My engine control fuse keeps blowing. Any suggestions to rectify this? If I put a 25a fuse in it won't blow. No codes.
 
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Old 04-26-2014, 04:04 PM
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what year truck and do you know what fuse # it is.
 
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Old 04-26-2014, 04:07 PM
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2002 and it is fuse 22
 
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Old 04-26-2014, 04:39 PM
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Sounds like fuel bowl heater is shorted, which de-powers PCM as well. Disconnect the wires from the fuel bowl heater at the bottom rear of the fuel bowl. Tape it up out of the way. Replace the fuse and it should be good. Do not reconnect fuel bowl wires. Off the top of my head I thought that was the 19 fuse. If it blows again check the wiring harness below the 42 pin connector on driver side, it can rub thru and short on the valve cover. Or maybe do that first.

Running the 25A fuse might melt something expensive, not recommended.
 
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Old 04-26-2014, 05:41 PM
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Old 04-26-2014, 06:20 PM
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That has been good help so far. 42 pin looks great no wear. Now I'm just trying to locate the PCM ground. Any ideas where that is?
 
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Old 04-26-2014, 07:46 PM
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We'll during my search for everything I was filling up the fuel bowl. Turned the key on engine off then checked out the fuel filter to make sure no leaks and noticed that the gpr was smoking. Now I'm replacing that and going from there.
 
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Old 04-28-2014, 10:44 AM
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I replaced the GPR and left the fuel bowl heater unplugged. I haven't had the same issue since. The fuel bowl heater looked ok, not broke and not touching the sides. Other then checking the grounds any other suggestions? Also how necessary is the fuel bowl heater? Yes it does get pretty cold here in Utah.
 
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Old 04-28-2014, 11:30 AM
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There are mixed opinions on how necessary it is. I am of the belief that it is necessary but you won't need it until the late fall. There are a lot of people who run year round without them, but after all those gelling issues last winter, I wouldn't do it. It's pretty straight forward and inexpensive to replace. Clay has them.

Fuel Bowl Heater Element - Riffraff Diesel Performance
 
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