Blowing fuses constantly
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Elder User
Joined: Apr 2001
Posts: 710
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Blowing fuses constantly
My truck keeps blowing the fuel pump fuse. I rebuilt the engine, and upon reinstallation of the battery the fuse blew. In an emergency all I had was 30 amp fuses not the 20 amp. But it blew the fuse after driving it for awhile. I did install a larger cam, and now it won't idle, so I have been playing with that as well. It keeps flooding the motor as well. My truck is a 95 with a 5.8 four wheel drive. I can turn a wrench really well but the electrical end of my skills is weak, so any help would be greatly appreciated.
JR
JR
Post Fiend
Joined: Jun 2002
Posts: 13,873
Likes: 3
From: Atlanta GA
If you have a in the frame rail Bosch fuel pump it is likely the positive connector where it enters the fuel pump is bad and shorting (more like overheating). I noticed this is a weak point in a salted road state. You can fix them, but, it takes a certain amount of skill for the soldering since it is embedded in plastic (not to mention BOOM factor) and heat sinking is a must.
Usually wiggling the wire you can make the pump die by itself.
If this was me, I would
1) make sure the fuel regulator is working, put a guage on the rail
2) make sure the in the gast tank pump is working (if you have two pumps)
3) change the fuel filter, not sure on your year, but, it probably looks like a small black cannister on the left rear frame rail.
4) remove the primary high pressure pump for an inspection
If you know your normal AMP draw, many times putting the vehicle on an AMP meter can tell you if the fuel pump is acting up. High draw or fluxes/dies.
Usually wiggling the wire you can make the pump die by itself.
If this was me, I would
1) make sure the fuel regulator is working, put a guage on the rail
2) make sure the in the gast tank pump is working (if you have two pumps)
3) change the fuel filter, not sure on your year, but, it probably looks like a small black cannister on the left rear frame rail.
4) remove the primary high pressure pump for an inspection
If you know your normal AMP draw, many times putting the vehicle on an AMP meter can tell you if the fuel pump is acting up. High draw or fluxes/dies.
