Diesel Fuel Pump Fuse Blowing
Very frequent fuel pump fuse blowing in a 1999 Ford Super Duty Turbo Charge 7.3 with over 350 K miles.
Truck was running fine and this past week on a cold day in Texas I left the car running in idle while drinking a cup of coffee and for my surprise when I came out the house to go to work the engine was no longer running. Checked for the issue and found a 30A fuse blown. Had the fuse replaced and turn the engine on but after around 15 minutes the fuse blow out again. Suspecting a bad fuel pump I replaced it and the engine ran good again. Left the truck ready to go to work in the next day which as again a very cold day in Texas. For my ugly surprise the same problem returned as it was before: the same fuse blow out again and the are I am with the same problem even with a new pump. I check all wires surrounding the pump but found no sign of fried wires. What makes me lost is why the fuse blow after around 15 minutes after engine is running? This problem started in a cold morning in Texas and I have no sign of gelling fuel. Can you help me to get the issue resolved? Thanks |
Did you change fuel filters? The pump may be blowing fuses because it is overworked.
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you might have a short to ground on the fuel pump power feed wire. Wires can corrode and fray internally. Hook a multimeter up to the fuel pump feed wire wire and shake the wiring, your voltage shouldn't drop or fluctuate at all.
If it does you found your problem. |
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Before changing filters, just to learn more about this car, I would like to isolate the pump from the circuit where the other devices are connected. With this I mean, keep the pump in use but not powered from the same fuse. Will the engine work correctly if I power the pump directly to the battery? I want to do something like that before changing filter. |
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Can be from other device connected to the same fuse? |
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How would you test the fuel heater? |
Unplug the heater and see if the fuse stops blowing. If it stops blowing the heater is the problem
Good luck!!! |
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When testing fuel heater and fuel pump make sure the vehicle is running. Matter of fact, run the vehicle and jiggle the wiring on the fuel pump and fuel heater, if the engine cuts off you found the issue. |
Fuse Blowing Problem Solved:
Regarding the fuel pump fuse blowing I finally got the problem solved. After reading all different suggestion about the problem, since it seems to be and electrical issue, I decided to go to the fuel heater first. Since the same fuse for the pump share power to the heater I thought it make sense to go to the heater and see how it looks like. Just after getting the fuel bow opened I saw the heater element broken and making contact with the ground and consequently causing short to ground and automatically blowing the 30A fuse. As soon I had the element replaced I got the truck running properly and no more blowing fuse. It was my first time working in a Ford F250 Turbo 7.3 Diesel. In reality this is my son in law truck. After getting the truck back in busyness we celebrate, with a help of this forum, one more lesson in how to fix this issue in his kind of car. Thanks every one. |
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