I have a 2002 silverado 2500 duramax with a 26 gal main fuel tank. I use it in pulling a 30 ft 5th wheel RV. I have 59,000 miles on the truck and recently installed an auxiliary 37 gal fuel tank which feeds fuel by gravity to the main fuel tank. The fuel gage worked perfectly for the first three fillups. I have been opening the auxiliary fuel tank valve when traveling and letting the fuel flow into the main tank as I am traveling. However, recently the fuel gage suddenly dropped to ''E'' and the low fuel light came on. I still had 26 gal in the main tank and approx 18 gallons in the auxiliary tank (checked when refueling) when the problem occurred so I know the fuel gage is inaccurate. I experienced no problems before installing the gravity feed auxiliary fuel tank.
Any solution or is it just a faulty gage?
Sounds like the sending unit in the main tank is faulty.
Have the trucked scanned and see if there is a dtc p0463, if it does that is a faulty gauge in take. you may also have a problem from the adding of fuel while driving..the ecm is looking for the gauge to drop as fuel is being used but with the gravity feed from auxilary tank it is seeing a rise in fuel level while moving..this could cause it to interpit a faulty fuel level sensor...shut off the auxilary tank and drive it for a while and see if fuel gauge acts right that way... you will need to have codes cleared by local dealer for gauge to start reading properly first.
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