Xterra/PathFinder Fuel Gauge Erratic – P0463 Check Engine LightAugust 7, 2010 11:00 am fuel pump, How To Auto Repair, Nissan
A common issue with many Nissans has to do with an inaccurate fuel reading. The fuel needle on the gauge may bounce around before finally coming to a stop. Sometimes the fuel gauge may take an excessive amount of time to show “full” after filling up at the gas pump. Many times the CEL (Check Engine Light) or also known as SES (Service Engine Soon) warning will display on the dash. Most of the time the trouble code pulled will be a P0463, the definition of this fault is “fuel level sensor input high.”
The difference in price for just the sender as opposed to the price for the fuel pump and sending unit can be $150 or more. The fuel sending unit fails at a much higher rate than the fuel pump on this particular model. With that being said, it may be more logical to replace just the sending unit and NOT change the fuel pump. This of course is the truck owner’s decision which other factors will need to be considered as well. Like, how many miles are on the vehicle? How long does the present owner plan on keeping the vehicle? How much does a $150 bucks mean at this point in time? Of course changing the entire assembly could save a break-down if the old fuel pump is soon to fail.
Doing the Repair on a lift by angling the tank.
Changing the Fuel Level Sensor
Vehicle lift or not, it’s best to have a mostly empty tank. If doing the repair on a vehicle lift, the tank does not necessarily have to be dropped completely. If doing this repair at home in the garage or driveway, the tank will most likely need to be removed completely. The reason is that the angle required to access the fuel pump/sending unit assembly will not be easy to obtain with the truck only a foot or so off the ground. Although a special fuel lock ring tool is available for purchase, many technicians use a screwdriver and a hammer to remove and install the lock ring. One word of caution: when re-installing the tank make sure the EVAP hose is placed back into the recessed portion of the molded gas tank. If it isn’t it can be crushed causing an evaporative incorrect flow trouble code.