Question about 2002 Chevrolet Blazer

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Troubleshooting non-functioning gas gauge on 2002 Blazer 2-door

Is there anything specific I should do to find what's wrong with a non-functioning gas gauge on my 2002 Chevy Blazer LS 2 Door? Thanks in advance!!

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Sure there is!

When you turn the key on, and the gauges and warning lights come to life, does the needle on the fuel gauge move a tiny bit? It should. If it does move a hair, this is a good sign your gauge is still good. If not, keep reading.

The gauges themselves are usually not at fault, but they can fail, of course. Usually, it's the sender or float that's the culprit. The assembly resides in the fuel tank in the module or unit that houses your fuel pump. Many customers (when faced with the cost of this tank job) will opt for waiting until the fuel pump goes bad, and replacing pump and sending unit together. However, there are obvious drawbacks to this!

ONE test you could do if you are good at driveway car work is this: Crawl under vehicle and find the bundle of wires (not tubes or lines) that goes up to the top of the fuel tank. Sometimes you can reach it through the rear wheel well. Follow this small group of wires up to wherever it plugs in to the pigtail coming out of the tank. THis could be on top of tank, or just outside the perimeter of the tank. Unplug this connection. Using a common 12 volt test lamp probe, ground the test lamp, turn the key to the "ON" position so dash lights up, and touch tester to each wire tip on the end not connected to the tank (engine side of wire harness.) Have someone watch the fuel gauge as you touch the leads one by one. The gauge should move when one of these is grounded thru the lite. Total deflection of the needle means your sender is at fault, not the gauge. BUt it's usually the sender, anyway. THey're cheap enough, but the labor on a tank job can vary from place to place.

Good luck, TT

Posted on Feb 23, 2009


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