The most common cause for a 2002 Toyota Highlander's gas gauge to be stuck at three quarters of a tank is a faulty sending unit. The sending unit is designed to detect the current fuel level and relay it directly to the gauge.
StUck in open position
How do i remove a stuck Cd from my 2005 Toyota Highlander? The CDs will not eject.
check the brake light fuse in the dash by your left knee, if it blows, cant shift park
Bad gauge, stuck sending unit in tank, grounded signal wire
If the fuel gauge is stuck, the needle never moves, then the gauge has a problem and needs to be replaced.
Bad sensor, stuck float, bad connection somewhere between the sensor and the ECM.
The fuel gauge on a Chevy may become stuck if the sending unit is defective or become disconnected. Without a signal from the tank, the gauge will not move.
either the fuel gauge needs replacing or the fuel gauge sending unit in the fuel tank is stuck
The gage is broken or the wire is broken or the sensor in the tank is broken or the fuse is blown.
temp gauge is stuck on hot
Float in tank is stuck or defective gauge Sounds like the sending unit is stuck in the full position.
Make sure that the coolant is full. Check for a stuck thermostat or non functioning water pump. These are the most likely causes.