I have a 2001 Tahoe. Whenever my gas gauge gets to 1/4 tank it acts like it wants to run out of gas. It starts hesitating and my check engine light starts to blink.. which is what it would do the few times i was actually about to run out of gas. A friend said she had the same problem and it was water in the tank. Does anyone have any other ideas on what it might be? Thanks...
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Re: Fuel Problem on 2001 Tahoe
Something with fuel pressure that's for sure! do you hear in the car a grrrrrgule sound sounds like back seat area? usual fuel pumps quit or make a racket for a while and quit or do what yours is doing any how be sure to hook up OBD 2 scanner to avoid gue$$ing your trouble scanner will show your fault code
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Either the fuel tank sender in the tank is bad and needs replacement, or the fuel gauge is faulty. I would bet the one in the tank is probably bad, because that's usually the case. Find the connection at the fuel tank, disconnect it and use a VOM to get a resistance reading while the tank is empty and reading 1/2. It should match the specs.
I have seen this type of problem before, this sounds like the engine is not getting the correct amount of fuel pressure it needs as you accel.the first thing is to remove the fuel filter and replace it, take the old filter and blow into it, this will tell you if its restricked. the next step will be to check fuel pressure, you will need a gauge for this test, hook up gauge at valve on the injector rail, take caution wear safty glasses as fuel is under pressure and will spary out a little as you connect line for the gauge to fuel injector rail valve, you will run the engine and also step on gas pedal as you watch the pressure, i would rev the engine to around 3000rpms and hold it to see if engine tries to stall or buck when it begins to act up look at the gauge and if the pressure drops as it starts to act up then the fuelpump is bad. its not able to keep up the pressure. start there good day.
Check your fuel filter if it needs replacement. Empty it out then connect it back. Try to start it again. Inspect the fuel filter if it filled with gasoline. Check if there is noise at the fuel tank to check if the pump is working. If it did not, inspect the fuse for your fuel pump and the relay. If both are good you may connect the fuel pump directly to the battery to see if it works. It may be a bad wiring.
It may also be water in the gas. Gas after a while will go bad. and the tank also condensates. You may want to try some HEET or some gas additive that reduces the water in the gas. And it maybe the pump pickup is bent wrong or something and is actually starting to come out of the gas. Remember the gas gauge is only an indicator. I doesn't accurately tell you how much gas you actually have. I have ran out of gas a couple of times because it trusted the guage, only to find out that my sensor in the tank was on consistant from one tank to another.