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Fuel sending unit inside the tank , gauge is in the instrument cluster . I had a Cadillac I was working on one time that had same problem , this was an 80's vehicle with a metal fuel tank . On the inside of the tank was a well so to speak ,a stamped piece of metal welded to the bottom of the tank . This is suppose to keep the fuel level constant for the float of the sending unit. Well this piece can lose an was moving around in the tank an it hung up the float arm causing erroneous readings . Had to order the customer a new fuel tank .
you'll have to drop your fuel tank most likely. best to buy a chilton or a haynes manual for that unless your pretty mechanically inclined. usually there are fuel lines, at least one wire plug, and at least 2 straps that have to be undone before lowering it completely.
On the top of the tank you will see a big white plastic piece. This is the top of the fuel pump/sending unit assy.
remove the lines from the sending unit. unplug connectors from the sending unit.
Now theres a round metal piece thats the lock ring. You need to use something like non-steel rod, wood dowell, sawed broom handle, etc and a hammer.. tap on it in in a counterclock wise direction to remove. Install going clockwise.
Some guys use just a long steel chisel or screwdriver and pound on that. Whit that does get the job done, it created a big risk for sparks and sparks plus half a tank of gas is a very bad combination hence why i reccomend you use something aluminum, brass, or wood to rotate the lock ring.
If your caviler has a plastic lock ring and not a metal one, youll need a super large pair of chanel lock pliers or a chain wrench to rotate it. You can try the chisel and hammer method on this lockring but it usually gets destroyed in the process.
do u mean the fuel pressure regulator? ok this i assume is what you need, the pressure regulator is located on the top of the fuel tank, to access this u remove the the panel covering the cargo area, the panel is on the passenger side, the pressure regulator is directly under that panel, to release the fuel line from the regulator Press the spring tab opposite the fuel line,twist, and pull. below see a picture of the regulatorassembly.
With the engine turned
, relieve the fuel pressure at the pressure regulator. Refer to the fuel relief procedure in this section.
Disconnect the negative battery cable.
Raise and support the rear of the vehicle on jackstands.
Drain the fuel tank, then remove it.
Using a hammer and a drift punch, drive the fuel lever sending
device and pump assembly locking ring (located on top of the fuel tank)
counterclockwise. Lift the assembly from the tank and remove the pump
from the fuel lever sending device.
Pull the pump up into the attaching hose while pulling it outward
away from the bottom support. Be careful not to damage the rubber
insulator and strainer during removal. After the pump assembly is clear
of the bottom support, pull it out of the rubber connector.
Connect the fuel pump to the hose.
Be careful that you don't fold or twist the strainer when installing the sending unit, or you'll restrict fuel flow.
Install a new O-ring on the pump assembly and then position them into the fuel tank.
Turn the locking ring clockwise until its tight.
Install the fuel tank and connect the battery cable.
If you dont feel like dropping the tank and hassling with the hangers because they often break cut a hole in the bed of your truck over the tank where the fuel pump is but be careful not to hit the wires. dont cut the piece out completely cut it so you can pry it up to oneside
Most likely it's not a pick up issue since the fuel sending unit is right to the bottom of the tank. It's going to be and electrical or the float in the sending unit is bent and is giving a fault's reading of 1/4 of tank when the tank is actually empty. It's common for the float to the sending unit to get knocked out of alignment if the unit is knocked around to much when installed in the gas tank and or wire harness has not been replace from the sending unit to the frame of the car which is only around $15.00. Fill the gas tank a few time to the top may realign the float and give you a more accurate reading. Good luck and hope this helps.
The fuel pump is in the gas tank. To replace it you need to drain most of the fuel out of the tank and remove the tank from the car. The car needs to be lifted up in the air enough to slide the tank from under the car. There is a metal ring on the top of the tank and it needs to be removed jently with a screw driver and a small hammer. This part (fuel sending unit) is worth lots of money so do not damage it. The pump is in the tank and will come out when the metal retaining ring/ fuel sending unit is removed. Install the new pump the same way the old one came out and reverse these steps for installation.
It may be possible to make the pump work for a short while if you hit the bottom of the fuel tank in the middle with a hammer.
Disconnect the negative post on the battery. Support the tank with a jack with a plywood piece. Disconnect the metal straps holding the tank. Slowly lower the tank. Disconnect the fuel lines from the top of the tank and plug them with a screw or something similar in size. Remove the retainer ring holding the fuel pump/sending unit with a brass punch and hammer. Pull the fuel pump/sending unit out and replace it.