Fuel injection fuse blows intermittently

Tiny
JIM WEBER2
  • MEMBER
  • 2001 BUICK REGAL
  • 3.8L
  • V6
  • 2WD
  • AUTOMATIC
  • 150,000 MILES
Fuel injection 15 amp mini fuse blows intermittently when engine is hot and running. Description for bad crankshaft position sensor seems to fit, but would this cause fuse blowing?
Tuesday, October 15th, 2019 AT 7:39 PM

1 Reply

Tiny
SCGRANTURISMO
  • MECHANIC
  • 4,897 POSTS
Hello,

Fuses blow because your vehicle has an intermittent short to ground somewhere in the circuit[s] it is protecting. This comes about because of Ohm's law, the law that governs electricity in your vehicle. Ohm's law states that if one of the three properties of electricity is constant[Voltage-Vehicle has constant battery voltage] and one of the two other properties goes down [resistance-resistance goes to zero because of the shorted path back to battery negative post] then the final property [Amperage/Current-Amps go to battery amperage rating] must go up proportionally, and "pop" the amps exceed the amperage rating of the fuse and it melts, breaking the circuit and preventing an electrical fire or components welding themselves together. In the diagrams down below I have included the wiring diagram for your vehicle's fuel pump circuit and a guide on how to find short to grounds. Please go through these guides and get back to us with what you are able to find out. You will need to use a Digital Multi-meter [DMM] to do this so here is a link below on how to use one, if needed:

https://www.2carpros.com/articles/how-to-use-a-voltmeter

Thanks,
Alex
2CarPros
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Wednesday, October 16th, 2019 AT 4:54 AM

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