Question about 1999 GMC Sonoma

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Blowing fuse In the black box under hood there is a 20 amp fuse labeled ECM B. I was told it is tied to the fuel pump and computer. Earlier this summer it kept blowing the fuse, I would replace it and be on my way. Afew days later it would blow again, so I ask one of your experts what it could be. I was told it was a short in the fuel pump itself. I put it off for awhile knowing it was a big job. Got tired of blowing fuses so Finally I changed the pump. All went well and I have driven the truck 4 or 500 miles since. The other day it blew again, only this time, it will not take a fuse, it blows right away. Any idea's? Comment by shep111, posted on Oct 27, 2008 Thanx drcool.....I will try that.....may take some time, the plug is rater hard to get to with tank installed but after I check it I will accept the answer or have another one..thanx again.....shep111 Comment by shep111, posted on Oct 28, 2008 goodmorning everyone, I posted this question yesterday and drcool gave a logical answer,but unfortunately after I unplugged the fuel pump and tried to replace the fuse, it blew again. Any idea's

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What your going to have to do is first locate a wirin diagram on your vehicle. You need to look at the schematics and find out exactly what is controlled on that circuit. Once you know what is all on that circuit you can than start to check your wires around those connections. I had a similar problem with my s10. My truck is a 1993 but it has the ecm b fuse as well. I was driving my truck with no problems. I parked it and a few days later came out to find that it would not start. I checked and found that I was not getting fuel and that my ecm b fuse was blown. I did my home work and looked at a wiring diagram and found all the circuits on that fuse. After some time spent under the hood, I found that over time I had 2 wires that had been rubbing on the base of the oil pressure sender and had been grounding themselves out on the block causing my blown fuse. The oil pressure sender controls the fuel supply and if the truck did not read any oil pressure, the computer shuts down the oil pump, to prevent any damage that could be caused by not having any oil pumping. I hope that I may have helped you in finding your problem.

-Bruce

Posted on May 12, 2009

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It's not the fuel pump, you have a short to ground somewhere in that circuit.

Posted on Feb 20, 2009

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1 Answer

My 2000s10 keep blowing the ecm b fuse when i trun the key on


That fuse ECM B also power's the fuel pump an fuel injectors ! It the under hood fuse / relay box ,pull out the fuel pump relay then put fuse ECM B back in an see if it still blows , You could have a shorted injector or fuel pump or the relay !

Mar 14, 2015 | 2000 Chevrolet S-10

5 Answers

20 amp ECM B fuse


check again the fuel pump. check the resistance if too low. or unplug the pump and put a fuse again, if the fuse will not blow, then the pump went bad again.

tnx 4 using fixya,

drcool

Oct 27, 2008 | 1999 GMC Sonoma

1 Answer

Where is the location of fuel pamp electric fuses


If Its under the hood
  • Raise the hood of your car and look near the battery for a black, plastic box. Unsnap the lid and raise the cover. On the inside of the lid there should be a schematic of the fuse orientation, and inside this box there should be an array of circuit breakers, fuses and relays arranged according to the schematic. One of the small, black relays is likely to control the fuel pump. Near the relay there is also typically a red, 10-amp fuse labeled "FUEL," "F/P" or "FUEL PUMP." If not, check under the dashboard.
If its under the Dashboard
  • Use a flashlight to look under the dashboard. In most cases, there should be a lower cover to access the fuse panel. Remove the cover with a small screwdriver and pull the lid off of the fuse panel. On the inside of the lid there should be a label that identifies the fuse arrangement, similar to the label on the power center under the hood. Look for the same lettering that designates the fuel pump fuse. If the fuse is not there, look in the specialty fuse panels.

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I WHANT TO NHOW WERE IS THEFUEL PUMP SWITSH FOR 2000 BLAZER


The fuel pump relay is ECM B and the fuse is a 20 amp fuse.
  1. Turn the ignition off.
  2. Remove negative battery cable.
  3. Now remove the cover to the fuse panel under the hood.
  4. Now remove the fuel pump relay. There should be a schematic on the inside of the lid.


Diagram is of the fuse block that is under the hood
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Regards, Tony

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1 Answer

1997 yukon, keep blowing ECM - 1, 20 amp fuse under hood . I had replace fuel pump a few months back, could it be a bad connection on the fuel pump?


i would check wire harness for bare wire but first i would look under that massive fuse box under hood, i kept blowing air cond relay and i traced it back to corroded connection on that fuse. not saying this is it and i hope it is that simple for you. other than that research exactly what the ecm-1 CONTROLS and search,test,grounds those systems. If i can come across any other symptoms i will forward them to you.

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Did you check your fuel pump relay and related fuses to make sure no fuses were blown? Passenger side under-hood electrical center shows # 3 fuse 20 amp fuse controlling fuel pump and ECM. Also #12 is also Fuel pump relay in Passenger side under-hood electrical center. These would be the first things to check.

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the fuse is marked ECM 1 or ECM 2 and is under the hood, as is the fuel pump relay, also these have fuel pump connector problems, did u carefully inspect the pins for heat damage?.

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There is obviously a short circuit somewhere. Best solution, take vehicle to nearest Hyundai Service Center, pay diagnostic fee. They will give you an estimate of repairs (parts, labor, tax, time-frame, etc.). This way you'll find out EXACTLY what the problem is and what's required to fix it.

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1 Answer

20amp fuse in black box keeps blowing


dear,


The fuse ecm b it tied to the fuel pump, PCM, and VCM.
Fuel pump could have an internal short
check it by the way...

regards,

Sep 30, 2008 | 1999 GMC Sonoma

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