fxmfrank Posted March 17, 2011 Report Share Posted March 17, 2011 My 2002 Deville has a problem with the fuel gauge. The only time it shows the correct reading is when you turn on the ignition and the engine is not running; otherwise, the gauge always reads full. Any ideas what the problem is? Link to comment Share on other sites More sharing options...
KHE Posted March 17, 2011 Report Share Posted March 17, 2011 Could be an issue with the wiring to the pump/sender unit or the sender unit itself may be bad. Sulfur corrosion from the gasoline may be another cause. GM fuel system cleaner is effective in removing the corrosion from the sender assembly. Add it to the tank, fill the tank and then drive the car until the tank is almost empty. Kevin '93 Fleetwood Brougham '05 Deville '04 Deville 2013 Silverado Z71 Link to comment Share on other sites More sharing options...
fxmfrank Posted March 17, 2011 Author Report Share Posted March 17, 2011 Could be an issue with the wiring to the pump/sender unit or the sender unit itself may be bad. Sulfur corrosion from the gasoline may be another cause. GM fuel system cleaner is effective in removing the corrosion from the sender assembly. Add it to the tank, fill the tank and then drive the car until the tank is almost empty. Thanks! I'll give the Fuel system cleaner a try before doing anything else. Link to comment Share on other sites More sharing options...
BodybyFisher Posted March 17, 2011 Report Share Posted March 17, 2011 While you are at it check for codes, my 02 Monte Carlo is setting a code for the gas gage, my gage is shorted, not sure yet if its the wiring or the level sensor itself, I need to check it with an ohm meter Pre-1995 - DTC codes OBD1 >> 1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/ Cadillac History & Specifications Year by Year http://www.motorera.com/cadillac/index.htm Link to comment Share on other sites More sharing options...
MadeInAmerica Posted March 18, 2011 Report Share Posted March 18, 2011 Chevron Techron is about half the price of the GM Fuel System Cleaner, but it comes in the exact same shape, color and sized bottle, with the exact same instructions and the exact same benefits listed. In other words, it certainly seems to be the exact same product for a lot less money --> My link Advance Auto Parts carries Chevron Techron for only $11.99. My local GM dealer had their version of this product for almost $30! -- My link Could be an issue with the wiring to the pump/sender unit or the sender unit itself may be bad. Sulfur corrosion from the gasoline may be another cause. GM fuel system cleaner is effective in removing the corrosion from the sender assembly. Add it to the tank, fill the tank and then drive the car until the tank is almost empty. Thanks! I'll give the Fuel system cleaner a try before doing anything else. Link to comment Share on other sites More sharing options...
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