Fuel gauge problems seem to be a common occurance in the Ranger series. My research indicates that the problem stems from one of three main causes: 1. A bad gauge itself - Possible, but usually not the problem 2. A bad sending unit - Most common cause. 3. A faulty ICVR - The ICVR (Instrument Cluster Voltage Regulator) Located on the back of the instrument cluster and limits the current to the gauges. If it fails, the fuel, temp, and oil gauges will not read correctly, if at all. 4. Wiring problems. If only the fuel gauge reads incorrectly, I would suspect either #1, #2 or #4. However, if other gauges are affected, think #3, but don't rule out wiring problems. Methods of testing the gauge are outlined in most of the aftermarket repair manuals, and it's usually easier to remove the bed to replace/repair a tank unit than to drop the fuel tank. Because the ICVR is a dealer special order part, and runs in the $85 range, I would exhaust all other possibilities before replacing this part. HTH, John
If its Fuel Injection U put a FI pressure gauge on the Fuel Rail.
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A 1990 Jeep Cherokee malfunctioning fuel gauge can be caused by a broken ground wire. The gauge will not function if the fuel float in the fuel tank is broken.
I would check the ground on the fuel sending unit
The ranger has a fuel sending unit inside the gas tank. These are notorious for going out. Only way to change it is to drain and drop the gas tank or remove the bed. The sending units that I have been looking at cost about $100
According to my Chilton repair manual , fuse # 16 is a 15 amp fuse for the fuel gauge on a 1994 Ford Ranger
The Ranger fuel gauge could have several problems causing it not to work. These problems include, blown fuse, bad wiring, loose connections, or a bad fuel sending unit in the fuel tank.
Inside the fuel tank combined with the fuel gauge sending unit
fuel sending unit is bad.
The fuel pressure for a 1990 D 21 pickup is dependent upon the size of the engine. In general, the fuel pressure should be approximately 20 pounds per square inch.
in the fuel tank
Try to see if there is a common ground wire to these 2 gauges. If there is make sure it is grounded to a clean dry grounding site and see if this helps.
Attach a fuel pressure gauge to the service port on the fuel rail.
The fuel gauge could be getting improper signals from the fuel sensor. The sensor is located inside of the fuel tank.
Under the vehicle, behind the driver.
Inside the fuel tank. The fuel tank must be removed to gain access.
My 1969 Chevy pickup has it in the fuel tank behind the seat
fuel sending relay is bad.
The fuel level sending unit in the tank is probably at fault.
It could be the fuse, but mine is because the floater that measures for the gauge is stuck.
Try replacing sending unit