Question about 2001 Chevrolet Impala

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Does the fuel gauge need to be calibrated after replacing the fuel pump assembly unit? And which oxygen sensor needs to be replaced when you have a significant drop in MPG and the exhaust smells rich?

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Fuel gauge should not need to be calibrated. As for the o2 sensor, it would be the front one more than likely. I would also check to make sure that the Mass Air Flow sensor is not causing the problem before just putting o2 sensors in. Is your check engine light on?

Posted on Jan 03, 2011

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Fuel gauge don't work properly


The float is in the gas tank. Difficult fix. Probably have to replace it.

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The fuel pump sending unit is most likely defective or out of calibration. It could of got bent or damaged when the pump was replaced & may need to be adjusted. Hope this helps.

Jul 04, 2011 | 1985 Cadillac Eldorado

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1981 Cadillac with digital displays. The fuel pump was replaced, and since then fuel gauge always reads full. (It was working prior to the replacement fuel pump)


Hello: This could be the fuel level sensor is not connected or the sensor assembly was damaged or bent when assembly was reinstalled or the fuel pump was not installed on the sending unit correctly.

Dec 25, 2010 | Cadillac DeVille Cars & Trucks

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Dash gas gage shows empty car runs fine previous owner put new fuel pump in it


Sounds like the fuel tank sender unit is faulty; keep in midn that the Passport fuel gauges can be calibrated, and won't work properly when out of calibration. Your local Honda dealer has the tools to calibrate the sending unit/fuel gauge assembly. That's the first thing to try, after that if there is still a problem you may have an issue with the sending unit itself or the fuel gauge on the dash.

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I have a Ford F-150, 2001, 6 cylinder. The problem is, ever since, I had my fuel pump replaced the gas gauge doesn't work properly, reads only to 1/4 of a tank, and the check engine came on. I have had my...


Your fuel level sensor is on the side of your fuel pump inside the gas tank. The pump will need to be removed and the sensor straightened out... Since excess fuel is pumped back into the tank from the fuel pressure regulator, (as well as emission return and vacuum) they probably messed something up there as well and gave you emission errors.

Dec 05, 2010 | Chevrolet 1500 Cars & Trucks

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Auto repair shop states that fule pump needs


If that problem with the gas guage is bothering you badly enough, then you will have to replace the fuel pump. The repair shop is on the up and up. The fuel level sending unit on the Mazda 6 is an integral part of the fuel pump assembly and is monitored by the computer. If the sending unit is defective then the entire pump assembly must be replaced, since the pump cannot be disassembled. Sorry about that, but I sure hope this helped ya!

Jul 21, 2009 | 2006 Mazda 6

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Fuel gauge quit working. stuck on half a tank. is there a fuse for just the gauge? do fuel tanks even have floats in them anymore?vor do i just need a new gauge?


the fuel level sending unit has been incorporated into the fuel pump assembly.
the fuel pump is most likely your problem, these pumps dont like fuel additives so be careful.
most common problem with these fuel gauges is the sending unit, the sender contacts will errode over time fuel additives seem to speed the process.

replace the fuel pump assembly

hope this helps

Jun 14, 2009 | 2002 Ford F150 Regular Cab

1 Answer

Guages on 87 olds cutlass are not working properly. fuel does not work, temperature works but goes strainght to hot as soon as the car warms up, amp gueage discharging oil pressure not working


Hi, you will have to replace all sending units for these gauges in order to restore them to there original state. i will list the sending units and there respective locations below.

1. Fuel gauge sending unit- you will need to replace the fuel sending unit on your Olds. its located inside the actual fuel tank. there's a floater attached to this Assembly and , its broken. you will have to replace the entire assembly. you will also have to drop the fuel tank to access it as well.

2. Temp guage-- normally when this guage starts to malfunction, its because of a bad coolant temperature sensor. Inspect the sensor's wires and connections. ECT (engine coolant temperature) sensor problems are often caused by faulty wiring or loose or corroded connections rather than the failure of the sensor itself. If the wires or connections are bad, replace them. If you think the sensor is defective, it should be tested.

This sensor is located Under hood, center, upper engine area, front of carburetor, passenger side of water outlet, mounted in intake manifold.

3. Amp gauge --- OK, this can be caused by a bad voltage regulator. i would also trace every single wire from the amp gauge to the sensor and regulator. check for corroded connectors and contact clips. replace any wire that may seem worn.

4. Oil pressure gauge-- This gauge will malfunction if the Oil pressure switch is faulty or not working. This is an Information relay unit for the indicator light or gauge on instrument panel. It contains a diaphragm that responds to changes in oil pressure. When the oil level is over a pre-set limit, the diaphragm opens the switch, turning off the light. When level is below the pre-set limit, the dash light comes on. In later model cars, if the oil pressure drops, the switch turns off the fuel pump, to stop the engine and limit damage to internal parts. Oil pressure switches can be grouped into two categories, units for electrical gauges and for mechanical gauges. If this switch is defective, it will have to be replaced. Once replaced, it will fix the dead oil gauge.

This device is located Under the hood, passenger side, front engine area, mounted rear of water pump. If the wires are worn or there is an oil leak near the switch location, replace it.

Inspecting all the above areas and replacing parts if needed, will fix your gauge issues.

Please rate and god bless:)

May 04, 2009 | Pontiac Firebird Cars & Trucks

1 Answer

When car idles gas gauge goes down to empty


Your code is PO462.  Isuzus made 99-01 with bad fuel level sensors as well as bad fuel pumps located inside your gas tank. You can just replace the sensor but i advice you to replace the whole "fuel pump assembly" to prevent another problem. At a shop this is a costly job they will charge 500$. But if you have faith you can do it your self..it is fairly easy to replace if you have a friend to help even better. but will need to erase the code before or after doing the job to prevent the same symptoms. Buy a "Fuel pump Assembly kit" with and  a gasket (around190$).Remember always  do a job carefully to prevent braking anything.  Raise your car, locate your gas tank unbolt the 4 bolts holding it, disconnect any sensors, there should be 2 other bolts holding the tank once down, you can see the assembly with hoses disconnect too. and pull the assembly out it715c7ea.jpgwill be tight, now  replace with new gasket and assembly kit press down firmly till it locks in. now connect everything the way you took out. Its actually easy...here is a pic of the whole assembly kit.....GOOD LUCK

Apr 28, 2009 | 2001 Isuzu Rodeo

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