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justin
New User
Aug 20, 2006, 8:39 PM
Post #1 of 6
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1997 Chevy 4x4
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I was driving down the road and truck stoped running would not start. I found the ecm b fuse was blown and replaced and blew again. Replaced fuel filter truck started drove about 1 mile and stoped again. what could the problem be
(This post was edited by justin on Aug 20, 2006, 10:19 PM)
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Tom Greenleaf
Ultimate Carjunky
/ Moderator
Aug 21, 2006, 4:54 AM
Post #2 of 6
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Re: 1997 Chevy 4x4
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Do you have a "check engine" or code going on? That might help with this, T
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DanD
Veteran
/ Moderator
Aug 21, 2006, 5:07 AM
Post #3 of 6
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Re: 1997 Chevy 4x4
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The ECM B fuse is part of the fuel pump circuit. The power in this circuit leaves the fuse panel in an orange wire going to the ECM, fuel pump relay and the oil pressure switch. Any one of which may have a short to ground in. The power on this orange wire leaves the relay and oil pressure switch in a gray wire going to the fuel pump; again a short to ground on this gray wire will also cause the ECM B fuse to blow.
Kind of a search and rescue type of repair and a process of elimination to find out who is the culprit. Check along the frame rail and the top of the fuel tank to see if this gray wire isn’t shafted bare and touching ground?
A couple of easy things you can try are; one, disconnect the fuel pump relay, replace the blown fuse. Crank the engine long enough for the engine to build oil pressure and that will turn on the fuel pump. If the fuse holds replace the relay.
Two: unplug the oil pressure switch and run the engine if the fuse holds replace the oil pressure switch.
I’ve had a few pressure switches short but it’s a long shot if this is the problem.
Dan.
Canadian "EH"
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justin
New User
Aug 27, 2006, 12:33 AM
Post #4 of 6
(3378 views)
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Re: 1997 Chevy 4x4
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The ECM B fuse is part of the fuel pump circuit. The power in this circuit leaves the fuse panel in an orange wire going to the ECM, fuel pump relay and the oil pressure switch. Any one of which may have a short to ground in. The power on this orange wire leaves the relay and oil pressure switch in a gray wire going to the fuel pump; again a short to ground on this gray wire will also cause the ECM B fuse to blow. Kind of a search and rescue type of repair and a process of elimination to find out who is the culprit. Check along the frame rail and the top of the fuel tank to see if this gray wire isn’t shafted bare and touching ground? A couple of easy things you can try are; one, disconnect the fuel pump relay, replace the blown fuse. Crank the engine long enough for the engine to build oil pressure and that will turn on the fuel pump. If the fuse holds replace the relay. Two: unplug the oil pressure switch and run the engine if the fuse holds replace the oil pressure switch. I’ve had a few pressure switches short but it’s a long shot if this is the problem. Dan.  DAN, I REPLACED MY FUEL PUMP AND ALSO MY OIL PRESSURE SWITCH MY TRUCK STARTED SEVERAL TIMES SO I OLEFT THE HOUSE TO GO GET GAS AND IT WOULD NOT START THEN I MESSED WITH IT FOR A WHILE AND NOTHING SO THEN A COP CAME BY AND JUMPED IT AND NOTHING THEN AS I WAS DOWN THE STREET MY WIFE STARTED THE TRUCK ON THE FIRST TRY THEN I GOT HOME SHUT THE TRUCK OFF THEN STATED IT TWICE THEN WENT IN ATE DINNER THEN CAME BACK OUT IT WOULD NOT START AGAIN I AM NO LONGER BLOWING FUSES BUT I AM AT A LOSS NOW DO YOU HAVE AQNY OTHER IDEAS FOR ME THANKS JUSTIN |
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DanD
Veteran
/ Moderator
Aug 28, 2006, 3:47 AM
Post #5 of 6
(3367 views)
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Re: 1997 Chevy 4x4
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Start back at the basics; the next time the truck isn’t starting test for spark at the coil and at the spark plugs.
Can you hear whether the fuel pump is running or not? During its prime cycle, during cranking or for a couple of seconds after the engine has been cranked? If so you may need to have it tested for pressure; teeing in a pressure gauge during one of its no start times.
You may have fixed the original short causing the fuse to blow, but inadvertently caused an intermittent bad connection or installed a defective pump?
Dan.
Canadian "EH"
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Tom Greenleaf
Ultimate Carjunky
/ Moderator
Aug 28, 2006, 10:54 AM
Post #6 of 6
(3362 views)
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Re: 1997 Chevy 4x4
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Dan mentioned a biggie here. "DEFECTIVE NEW PARTS" It happens way too much and a major cause of hair loss!!!! It's worth checking out again and we all get confident in a new part but it isn't always so, T
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