Main Tank Gauge Fault

[Redds008]

Nissan Patrol TI 4.8 2003 Main tank gauge reading full all the time therefore not allowing the sub tank to transfer even when main is dead empty ...... Nissan dealership wanted me to spend $3000 for a new dash and would not guarantee this would fix the problem ! any ideas please:

[AB]

Hi mate, did they confirm that the fuel sender unit was working 100%.

[Yendor]

Welcome to the forum,

The main fuel tank sender unit is made up of two parts.

One is a variable resistor, the resistance value changes as the fuel level goes up and down (via the float)

The second is just an open and closed switch, when the main fuel tank is full the switch is closed.

The first thing I would do is check the wiring harness going to the main fuel tank, make sure it is not damaged or cut.

Does or has the vehicle had LPG fitted?, does it have a long range main fuel tank fitted?

You can remove the fuel tank sender unit from the main fuel tank and test.

[warey]

id try this easy test before getting to that stage, try this

1. Turn ignition switch to ON and change odo/trip meter to ‘‘TRIP
A’’ or ‘‘TRIP B’’.
2. Turn ignition switch to OFF.
3. Turn ignition switch to ON when pushing odo/trip meter switch.
4. Confirm that trip meter indicates ‘‘000.0’’.
5. Push odo/trip meter switch more than three times within 5 seconds.
6. All odo/trip meter segments should be turned on.
NOTE: If some segments are not turned on, speedometer (unified
meter control unit) with odo/trip meter should be
replaced.
while in that mode every time you push the knob the gauges should go to half way, if not then look at sender units
At this point, the unified control meter is turned to diagnosis
mode.
7. Push odo/trip meter switch. Indication of each meter/gauge
should be as shown left during pushing odo/trip meter switch if
it is no malfunctioning.
NOTE: It takes about 1 minute for indication of fuel gauge to
become stable.
ive had a gauge stuck before and it was a case of taking the cluster out and re setting the needle (it was stuck due to the background template jamming the needle.
cheers warey

[Sretch]

Don't forget to check your earths as well. Especially Body to chassis.

Regards

Paul

[jedskipow]

There is a plug under passenger seat behind chassis rail that has all th wires for the back on it. GQ 97 ute.

[tonnik]

Hi Mate,

I have the same fault on my 2003 Ti 4.8, what was the outcome, did you sort it out?