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05-22-2011, 07:44 PM | #1 |
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Join Date: Oct 2007
Location: Fort Smith,AR
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'95 ECM-B fuse blowing! Need help!
Ok, it's a GMC '95 with a 305 but the vin showed a 4.3. I know the tranny was a 5spd but it's 4L60E now. Not sure it'll matter though. I had a coil pick up, and ignition module go out, then the fuel pump got weak and wouldn't run the injectors for the TBI engine so I replaced it. It's now blowing the ECM-B fuse, the mini fuse under the hood and that let's the fuel pump kick on. Now I replace that fuse, turn the key and POP, it blows right away. It's blown two. What's the deal? I suspect wires touching but beside the fuel pump what should I look for? What other things does this run that could be grounding out?
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05-23-2011, 06:40 AM | #2 |
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Re: '95 ECM-B fuse blowing! Need help!
It's just a fuse for the fuel pump relay. I'll have to check my fuel pump ground I guess. That's probably it lol. Just answering myself haha.
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05-23-2011, 01:15 PM | #3 | |
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Re: '95 ECM-B fuse blowing! Need help!
This is the only diagram I have and it is pretty vague but if you are blowing a fuse it's due to over-current possibly from a short to ground, does it blow if you remove the relay?
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05-23-2011, 01:21 PM | #4 |
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Re: '95 ECM-B fuse blowing! Need help!
I did some searching that's why I knew it was the fuel pump only. Yesterday I put the 3rd fuse and it blew when I turn the key on. It doesn't waste anytime at all. I can pull the relay and try again after work and see if it blows right away. Without the relay it won't work anyhow but it could be between the two. I know I lack a good ground.
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05-23-2011, 01:31 PM | #5 | |
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Re: '95 ECM-B fuse blowing! Need help!
A poor ground wont blow a fuse, low resistance to ground will, either through the fuel pump or a dead short. Pulling the relay will just verify that the short is between the relay and fuel pump. Most likely when you put it all back together a wire was pinched causing a short.
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1965 GMC shortwide big window 1969 Chevy C20 long (for now) 2005 Silverado 2500HD Crew Cab Quote:
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05-23-2011, 01:40 PM | #6 |
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Re: '95 ECM-B fuse blowing! Need help!
Here's a little more info if it helps. My pump was bad, it's a blazer tank, and I have a '94 I use parts for my '95. I dropped the tank and pulled the '94 fuel pump but because it was a longer bracket and hit bottom of the blazer tank I pulled it apart and used the pump only. Now with a 1/4 tank it's showing full, well maxed out almost back around to empty. Now I have this fuse blowing, and I shouldn't have any wires touching. I pulled the bed, swapped pumps and it sounded good and worked fine for a while. The pumps grounded to the frame, because of the blazer tank the pump wires and plug was cut off and spliced from behind the cab to the rear.
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05-23-2011, 10:27 PM | #7 |
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Re: '95 ECM-B fuse blowing! Need help!
I appreciate the help but I'm pulling it to the shop tomorrow. Thought about doing a fuel pump because it could be a bad used fuel pump. When it works it's loud and sounds good but it may be causing the fuse to blow. I don't have the tools or knowledge to fix electrical stuff. I'm a shadetree type mechanic guy with no tools really lol.
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