1997 Chevy Tahoe Fuel pump blowing ECM-B fuse

STEELDAWG47

MEMBER
1997 CHEVROLET TAHOE
V8
4WD
AUTOMATIC
18,000 MILES

Never a problem with this truck however, this morning, I tried to crank it and immediately checked fuses and found the ecm-b fuse blown. Replaced the fuse, put key in on position to listen for fuel pump and heard it come in, but about a second later heard the fuse blow again.I ran out of 20a fuses and out of curiousity used a 30a, and it held (not that I'd run it that way), but thought the fact that it held may shine a little more light on the problem. Any suggestions? Thanks.

5 Replies

RASMATAZ

MECHANIC
75,992 POSTS

Its shorting out some where within the fuel pump circuit-disconnect the fuel pump connector and try again-blows remove the fuel pump relay and see what happens

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Tuesday, January 26th, 2010 AT 8:09 AM

STEELDAWG47

MEMBER
3 POSTS

That was one of the first things I did. Could it be the pump itself?And if was simply a short, would the wire not have burned when the 30a fuse held?

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Tuesday, January 26th, 2010 AT 8:15 AM

STEELDAWG47

MEMBER
3 POSTS

I know it wasn't much of a donation, but expected a less generic answer. Anyone else have any sugestions. It would be greatly appreciated. This is my only vehicle and I'm stranded here.

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Tuesday, January 26th, 2010 AT 8:30 AM

RASMATAZ

MECHANIC
75,992 POSTS

Sometimes it shows and not at all-to rule out the fuel pump set a jumper wires with an inline fuse same amperage and power it from the battery and see what happens-could very well be the computer control of the fuel pump relay circuit

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Tuesday, January 26th, 2010 AT 8:32 AM

STEELDAWG47