The fuel pump is seizing up and drawing excess current. Check with a known good pump.
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!
SOURCE: truck wont start keeps blowing the ecm batt fuse
You have a short (bear wire) somewhere. Trace the wire and find it.
Have a great evening
SOURCE: fuel pump fuse blowing
replace the fuel pump, it is drawing to much current, this is common when the pump bearings get worn out, also make sure you replace the fuel pump connector at the fuel tank connection, it will be burnt..
SOURCE: fuel pump fuse blowing
fuel heater in the fuel / water bowl was bad so it kept blowing fuse #30
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