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I hooked up the used tank the gas gauge don't work it keeps blowing the ECM B fuse I changed the ground wire it ran for 15minutes then I put it in reverse and it blew the fuse now it blows when I turn

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Check for a princh wire some where on the wireing harness that hooks up to the sending unit on the tank, Or a break in a wire, Or evan bare wires, if you don,t find any of that stuff ,There is a problem with the sending unit on the tank. But to me it sounds like a problem with one of the wires going to it.

Posted on Oct 25, 2012

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Posted on Jan 02, 2017

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SOURCE: the ECM fuse keeps blowing out

check the wiring to fuel tank something shorting. replace wires to fuel tank.

Posted on Apr 09, 2009

dmsr63
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SOURCE: chevy 1500 silverado 4x4 step side 350 truck

I would look closely for a pinched wire around where you did the repair, it may be in a wire loom, so look closely.

Posted on Mar 13, 2010

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1 Answer

96 Mercury cougar gas gauge won't work


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How do I repair or replace a defective gas gauge?


It is in the instrument cluster, which has to be removed to replace the gauge. It cannot be repaired. Did you first check the 10 amp METER fuse in the fuse panel?

Now let me say, that when the gauge quits, it is more often a fault in the sending unit in the gas tank, and not the gauge. Here is how to find out if your gauge is good: Find the fuel tank electrical connector, and pull it apart. You will need a small jumper wire. Find the blue wire in the body side of the connector (not the fuel tank side). Put the jumper wire into the blue wire terminal, turn the ignition key to on not start, and ground the jumper wire to a metal frame piece. Someone needs to watch the fuel gauge needle while the wire is grounded. If the gauge in the dash is good, the needle will move. It will probably go to either full or empty, but if the needle moves, the gauge is good and the fault is in the sending unit in the tank. Don't give up testing until you are sure the jumper wire is being grounded good to the frame. Just touch the wire to frame and watch the needle movement, once sure, stop so you don't blow the fuse. If the needle doesn't move, first check the 10 amp meter fuse. If fuse is good, it must be the gauge.

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Gas gauge won't work and it has a full tank of gas. Is there a fuse I can change.


There might be but it is unlikely a fuel gauge is fused alone; usually if it is a fuse other things will stop working too but I suggest you are guided in this matter by your car handbook.

Problem is probably wiring and in particular the grounding of the fuel tank sender unit. It could be a faulty sender but they are usually quite reliable.

Test by disconnecting the wire from the sender unit at the fuel tank and short to a good ground and the gauge should read full. If the gauge wire is in a block with other wires it will be necessary to positively identify the gauge wire before testing.
If the gauge reads refit the wire and duplicate the ground wire to a known good ground. If the gauge still reads the fault is a bad ground to the tank sender unit and if it doesn't the sender unit itself is probably faulty.

If grounding the gauge wire does not produce a reading the fault is the wiring to the tank, the supply to the gauge or a problem with the gauge itself.

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1 Answer

No gauges


https://s29.postimg.org/9pcd6l3uv/instrument_cluster.jpg

Click on the link
This is a partial, should be enough to show voltage and ground.

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1970 Ford F100 Gas Gauge Not Working


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1993 Buick Roadmaster keeps on blowing fuel pump/ecm in-line 20 amp fuse. Car stalled out in a parking lot, would not start, no fuel. Changed fuel pump, fuel filter, fuel pump relay. Found fuel pump/ecm...


Sorry to say it could also be a faulty ECM. The ecm uses circuit boards to provide grounds to a bunch of components and can short out internally.
Most of those components can fail and cause the same problem by causing a short "thru" the ECM. Things like injectors, O2 sensors, and so on.
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I'm thinking the ECM is bad and grounding out, causing the car to blow the fuse. The old gas wouldn't cause this problem.

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The ECM-B fuse is a 20 amp fuse, and you should NEVER put a larger fuse in to try to overcome any problem. The oil pressure switch is a secondary concern; there is an idiot light or oil pressure guage in the dash to alert you to oil pressure problems. Under heavy load, such as towing, your engine requires more fuel, and if your fuel pump is going/has gone bad, it cannot supply the demand.
The problem is almost certainly a fuel pump wire harness short, caused by a dying fuel pump. I have both had this problem myself, and repaired it on three other vehicles. On my vehicle, the wire harness had welded itself together when the fuel pump locked up, and the wire harness caught on fire.
The fuel pump is in the gas tank (of course my tank was full), and the tank has to be dropped to access it. The wire harness is modular, with plugs at both ends, and can be bought from the Chevrolet or GMC dealer.
If you put an incorrectly-rated fuse anywhere in your vehicle's electrical system, the WORST place to do it is where you have--the fuel pump circuit. Fuses blow for a reason, and the manufacturer's engineers properly size the fuses for the application at hand. Please don't do that again.
This can be a very dangerous problem and repair, and no, it is not cheap.
Do not attempt to operate this vehicle until you have had the problem properly corrected. Good luck.

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