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Oil send unit 4.9.l
that attached to the fuel pump in the tank
above the oil filter under the exaust manafold.
On the side of the block just above the starter.
Is it a six cylinder . That would be on the thermostat housing.
fuel gage sending unit inside the fuel tank
Should be on the intake driver side toward the front
It could be your fuel gauge or your sending unit or the wires connecting them . If you have dual tanks it could be the switch that changes tanks. The most likely culprit is the sending unit in the tank.
RH Side Of Engine.on the timing chain cover in front of the oil filter
its located in the tank. you need to drop the tank in order to get to it as it comes out from the top.
in the fuel tank
usally by the oil filter or top of motor at the back Rooterman2.