What is a fuel selector valve?
The fuel selector valve allows the pilot to choose which tank is feeding fuel to the engine. Some systems require you to alternate between Left and Right tanks, while others offer a Both position.
What kind of gas tank does a 1987 GMC half ton have?
Discussion in ‘ 1973-1987 ‘ started by Guam52, Jul 1, 2007 . I have a 1987 short bed GMC half ton 4×4. The passanger side tank works fine. As soon as I switch over to the drivers side tank the truck shuts off. I would appreciate and ideas on this, before I dive into it face first.
Why is my gas tank missing on my 1987 car?
Bad selector switch in the dash. Ground is missing on the tank. The large O ring that seals the sender unit in the top of the tank also electrically isolates it from the tank and the rubber straps that hold the tank in place isolates it from the chassis.
How does a fuel pump work on a gas gauge?
The fuel pump module includes the fuel sending unit, used by the gas gauge to detect and display fuel level. https://www.flickr.com/photos/3ndymion/33556245572. The gas gauge is a relatively simple circuit, but its simplicity means each component is essential to its function.
Is there gas in the passanger side tank?
I have a 1987 short bed GMC half ton 4×4. The passanger side tank works fine. As soon as I switch over to the drivers side tank the truck shuts off. I would appreciate and ideas on this, before I dive into it face first. There is gas in the tank. The truck is fuel injected and the sending units are mounted on the tanks.
How does the gas gauge work in a Ford?
As your gas tank is drained of fuel, the float drops and an electrical current is sent to the gauge to tell the driver what’s going on with the supply. When the fuel level changes, the current also changes — higher currents mean the tank is full and lower currents mean the tank is moving towards empty.
What should fuel gauge read if tank is full?
Take an ohmmeter and see what the resitance is between ground wire and the purple wire. If the tank is empty, it should read around 0, if it’s full, about 90 ohms. If that’s right, then check the wiring going to the gauge for excessive resistance.
What would cause a fuel gauge to peg way past full?
Re: What would cause a fuel gauge to peg way past full? Generally, if your gauge is reading past full and the tank isn’t full, it’s the positive wire that has a connection problem. If it’s reading totally empty, it’s the ground. If your tank if full of gas right now; I’d drive it for a while and see what happens.
Why is my gas gauge not working at high fuel level?
Some systems are wired so that high fuel level contacts the low-resistance section, gradually increasing resistance as fuel level drops. The system thus outputs higher voltage at high fuel level, gradually dropping voltage as fuel level drops.