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That is not unusual for many vehicles. Fuel gauges are approximations only. They tend to show full too long and drop very quickly toward empty later. Nature of the beasts.
The oil pressure gauge on a 2004 WJ doesn t really show the pressure, but it will go to a preset value when pressure is ok, or it will stay at o PSI. So you need a pressure switch on this jeep and not a pressure sending unit. If the right unit is installed, then or the pressure indicator is faulty, or wiring. Do a test of the instrument panel to see if the indicator works: ignition switch in off, press the odometer reset button and now switch ignition in run. Instrument panel will start a self test, all lights will come on and all meters will go full scale and return to normal.
The first thing i would check is the fuel system hook a fuel pressure gauge up to the fuel rail and check the fuel pressure, after you have verified the fuel pressure is good let the gauge sit and monitor how much "bleed down" occurs if the bleed down is out of spec i would bet the fuel pressure regulator is bad or theres a leaking fuel injector causing fuel to drip into 1 or more of the cylinders causing a rich condition at startup.
It sounds as if the sending unit (located in the tank) is wearing out
Does it work better at some capacities then at others if so the is the sending unit. I know I have seen some gauges read fine at nearly full to 3/4 tank, after which the gauge falls right to zero.
I hope this may have helped,
Tom
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