Question about 1999 Chevrolet Blazer

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The fuel gage is not reading correctly. The fuel gage bounces around what could be the issue

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99% OF THE TIME THE FUEL SENDING SENSOR IS DEFECTIVE. ITS LOCATED ON THE TOP OF THE FUEL PUMP ASSSEMBLY. ITS ABOUT 60-70 BUCKS FROM YOUR LOCAL DEALER. U HAVE TO TAKE THE TANK DOWN TO GET TO IT

Posted on May 01, 2010

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Posted on Jan 02, 2017

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Gas Guage bouncing strong gas smell before 1998 Chevy Blazer wouldn't start at all. Engine still turns over


Check your fuel pressure, if low or no pressure, replace fuel filter first. My guess is the fuel pump and sensor are bad. You may also want to see if your getting spark, but I don't think bad plugs would make has gage jump around, but if they are not sparking correctly they will allow gas to flood the motor and that's when you get the gas smell

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Your problem, as to my knowledge, seems to be more of a ground issue, or power supply issue. Check the grounds throughout your vehicle, including the ground for the fuel pump.

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Hello I hav a 2001 dodge durango that is saying its out of fuel. We put fuel in it, changed the fuel pump, nothing has worked. It reads a code "no BU5". does anyone have any suggestions as to what the...


It could be a stuck floater in the tank, or a bad fuel gage. Most linley it's a stuck flaoter. The tank has to be removed in order to fix. It sounds dumb bt works sometimes. With aprox. Half a tank bounce the vehicle or go on a bumpy road which will make the back end bounce. It might help it unjam itself. Also try rocking it side to side

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p0463 is a self diagnostic code that is for the fuel gage sending unit located inside the fuel tank if your fuel gage is reading empty just after you filled it then that verify's the code is correct you have a bad sending unit

May 31, 2009 | 2005 Jeep Liberty

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I have a 94 chevy s10 and my gas reads empty while i drive.but when i shut off the truck the gauge moves to different readings.


Is......the problem--"the gas gage reads empty when there is fuel in the tank. OR, The gage moves when the key to turned off ?

If it's the first,
You will need to test the gage and through process of elimination, determin if the Sending unit inside the fuel tank has gone Bad.

If its the second ? - Electrical gauges will move when powered down. Normal

Testing the gauge may not be easy - just depends on your ability.
It is a simple 2-wire gauge circuit, when disconnect (usually need the fuel tank) the gage reads in one direction (either full or empty)
then when shorted-the gage reads in oppisite direction.

Of course you must select the correct wires or you may short out the wrong circuits!! Most GM vehicles use a purple wire & black wire.

A quick method I have used to check the in-take part of the gauge is this.
1st. know there is gas - 1/2 tank works best.
2nd driver's door open, key in run position, engine not running.
3rd gently lift up on the door then let if come back down, gently.
just enough to cause the gas to slosh around.
4th - keep an eye on the gas gage, a bad sending unit in the take will show up as a "twitchy" needle.

Of course, if the gage never leaves empty - sloshing won't work.
I have a known good sending unit I can plug into the vehicle and simulate different levels of fuel - if the gas gage works, I know the problem is in the tank.

Let us know.

Dave

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1 Answer

I have a 1991 buick park avenue ultra


Speedometer or fuel gage?

If speedometer which is bouncing around, it is likely a bad ground near where the speed sensor wire harness (which connects the speed sensor to the rest of the "network") exits the transmission housing. It's at the very back of the transmission (you have a 4T60E trans) to the left of where the right side half-shaft leaves the trans housing. Just look for damaged wires. If none, replace the speed sensor for $50-60.

If it is the fuel gage, the sensor is probably not "zeroed"--it's reading wrong, too high, and if it were to start at true "empty", it would read right. Thus, the gage is always reading a little high (maybe a 1/8-1/10th of a tank too high?). This isn't a problem until to stop, start, or turn quickly and cause the fule to slosh around in the tank and starve the in-tank pickup which sends fuel to the engine.

If it is the fuel gage, you should simply put as much fuel in as you can and see if the needle goes far above "F". If it does, note how far it went and then practice filling the tank when the needle is that same distance above "E".

Hope this helps.

Sep 15, 2008 | 1991 Buick Park Avenue

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