Posted by Determined on November 10, 2020 at 10:07:45 from (216.130.212.201):
In Reply to: Chevy Truck Tech ? posted by banjoman09 on November 08, 2020 at 18:59:16:
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Good to hear you have it running, for now at lest.
I have seen these trucks in the past where as the pump starts to fail it will draw high amperage leading to melted connectors and relays on up to blowing the fuse that supplies terminal 87.
As far as checking amp draw one could use a clamp on DC amp meter on the power supply line to the pump to see what the draw is, problem with that is when the pumps start to go they do 1 of 2 things.
1-They die and stay dead.
Or
2-They work intermittently;
- cycle key 5 times and on the 5th try sometimes it goes.
-cool off overnight sometimes it goes.
-full tank vs 1/8 tank sometimes it goes.
-beat on tank with rubber hammer or boot and sometimes it goes.
In most all of the #2 reasons they will tend to momentarily draw high amps which can be hard to detect with a meter.
Water/ice can cause high amp draw as can a badly plugged filter or other fuel flow restriction.
ECMB should take a 20 amp fuse, a good fuel pump typically will draw less than 10 amp.
If you were to for test purposes install a 15 amp then a 10 amp fuse and test drive the truck to see if the fuse blows it will give you a reasonable idea the pump is pulling more than it should.
Last thought if you are having numerous intermittent issues I have had to lift a few of those fuse boxes after mice decided to have a feast on the wire insulation, purple seems to be their favorite flavor.
Lift off the box and find a half a dozen wires bare for a couple of inches, does real neat things when you go over a bump.
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