JEEP STALLS WHEN TEH GAS GUAGE GOES TO FULL WITH ONLY A HALF A TANK
HERE WE GO, THESE ARE A LIST OF ITEMS THAT HAVE BEEN REPLACED. FUEL PUMP, FROM THE DEALER, CRANK SHAFT SENSOR, IGNITION ELEC SWITCH. EVERYTHING CAN BE FINE GO TO THE STORE NO PROBLEM, GET BACK IN AND TRY TO START IT AND THE GAS GAUGGE GOES TO FULL AND IT WONT START. COULD THIS BE THE ECM GOING OUT?
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David Johnson is wrong about that. The Chevy HD dual tank has two sending units, one in each tank , one fuel pump, a fuel pump relay switch and a equalizing pump. If the truck stalls out at 1/2 tank, it is the equalizing pump. That pump, pumps fuel from the rear tank to the front. If the pump is out, the front tank empties, the truck shuts down, the guage reads half tank because the back tank is still full, but the equalizing pump won't pump the rear fuel tank load to the front. Hence the problem you listed above, not a sending unit.
The gas guage has a sending unit in the tank attached to the pump, there is a small circuit board on it that has smal"fingers" that send the signal to the guage.These get worn off and thus sends a false reading to the gas guage in the dash. The gas tank must be removed and a new unit put in to solve the problem. I had to do this repair to mine. As for the gas issue, just try pulling the nozzle back out of the filler neck when putting gas in, sometimes the overflow tube gets plugged up and won't allow the air to escape as the gas goes in the tank, making the gas pump think the car is full, pulling the nozzle will allow the air to escape. Hope this helps.
The gas guage is a seprate problem, the gas fill hose may have a sharp ben in the hose or kink, the gas pump hase a shut off valve that shuts off the pump if gas does not flow freely ie:blockage or full tank, I would visualy inspect the filler hose from the gas cap to the tank for again sharp bends or kinks, if the filler hose is in anyway restricked the pump may asume the tank is full.
the gas guage: is usualy a simple flot on a rod in the tank (like a toilet tank has) instead of opening or closing a valve it operates a "potentiometer" veriable position sensor (kind of like a dimmer switch).
if the float gets stuck the guage will stay in that position, the guage gets the signal via the wire harnes, so check the electric circit.
A trick I used on one of my jeeps (I removed the guages ) I filled the tank, reset the trip odometer to zero, put a jeerycan and a couple gallons of gas in the jeep, then drove normaly a week or so till I ran out of gas. wrote down the mileage on the trip odometer. gerrycan gas got me to the gas station.
divided the mileage by half. I fill up the tank all the way the reset the trip odometer to zero, when I reach the half mileage of the tank I fill up again and repeat