Question about GMC Cars & Trucks
Ive got a 1989 gmc sierre that blows fuses for the fuel pump. Now the weird part is the truck will run but will shut off randomly shut off ( blows fuse) if you about an hour and put a new fuse in it'll start agian and run for so long then blow the fuse. Thought it might be a short some where but not a 100% sure.
The fuse is designed to protect your wires from melting due to current overload. faulty fuel pumps may use more power before failure, so Cody change your fuel pump and filter, the result will amaze you
Posted on Jan 03, 2014
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Posted on Jan 02, 2017
if you replaced fuel pump i would look at backward wiring when replaced and i would start at the source of work if your vehicle was working fine before replacement then 9 out of 10 it will be your fuel pump wireing
sometimes when putting wireing back together the connectors have the missing clip and in turn you can turn the wireing in both directions now where positive is touching the ground on both sides of connector kris kross problem check your work this is crucial use a test light to find the right wires where they go
Posted on May 26, 2008
SOURCE: blows fuses
Generally speaking, a fuse 'blows' because too much current is drawn through that circuit. In this case I suspect a 'short-to-ground' or a bad voltage regulator (inside the alternator in a GMC). First, I would check the alternator's output voltage. Easiest just to look at your guage. Up to 14 1/2 volts is normal on a GM (with truck running), if it's higher - you need a new alternator. If it's under 14 1/2 volts, you
MUST find the short. Unless you have the specialized tools, (short-circuit finder, voltmeter, wiring
diagrams, etc.) this should be left to a competent automotive electrical shop. It could be as simple as a wire's insulation worn off or a short 'inside' the ECM (you truck's engine control computer). No matter what, one trip to a competent mechanic will probably be cheaper than continually replacing the computer and/or towing bills. Good luck!
Posted on Nov 24, 2008
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