arista5 Posted December 30, 2013 Share Posted December 30, 2013 My pathfinder started doing this and now is becoming more frequent. Full tank registers full.... after about 3/4 tank then its a guessing game. I can run 200 miles and it still says 3/4 tank or it will say 1/3 tank. i would be 250m and it shows 1/2 tank. then all of a sudden the fuel light will come on and the needle drops. or it will be perfect through the entire tank. its annoying to have to watch the trip mileage just to be sure i know where i am at. its utterly frustrating, and i am asking if anyone has any clues? i couldnt find a typical ground for the fuel sender so i am guessing it may be that? any help is appreciated. Link to comment Share on other sites More sharing options...
Towncivilian Posted December 30, 2013 Share Posted December 30, 2013 Run Chevron Techron fuel system cleaner (20oz bottle) in 2 back-to-back tanks. It may be sulfur build up on the fuel sending unit. Link to comment Share on other sites More sharing options...
arista5 Posted January 2, 2014 Author Share Posted January 2, 2014 Thanks for the reply, Just bought two bottles on amazon. couldnt find any local (advance, autozone, pepboys, and dont have any chevron stations here) hopefully it works, and thank you again Link to comment Share on other sites More sharing options...
tony762 Posted January 19, 2014 Share Posted January 19, 2014 Did it end up working? Noticed my fuel gauge today stayed at full for 60 miles then when I shut it off and started again it dropped to 3/4 full. Then I thought, wow!, 60 miles on a quarter tank doesn't seem right. Any other ideas? Link to comment Share on other sites More sharing options...
arista5 Posted February 19, 2015 Author Share Posted February 19, 2015 sorry I had not been back since this.... Yes it worked fine while using the additive.... No it is not fixed, 4 bottles later.. doesnt work except when the additive is in. anyone have directions for changing it out? do i need to drop the tank? Link to comment Share on other sites More sharing options...
01Pathmaker Posted February 22, 2015 Share Posted February 22, 2015 Under the drivers rear seat bottom, pull up the sound deadening/insulation mat, you'll see an access panel, remove those few bolts and the panel, then you have dirct access to the fuel sender/pump assembly. Pretty self explanatory from there. Before disconnecting any fuel lines though, its a good idea to pull the fuel pump relay while the vehicle is running, let it run itself out of gas, pretty much eliminates any spills when disconnecting lines. Link to comment Share on other sites More sharing options...
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