Each tank uses it's own float. The tank your switched on should show on your gauge. If it's not, it is usually the ground wire for the pump, and sometimes the sending unit itself. You do not need both pumps to have gauge work on a truck that old.
Each tank/pump has its own unit. Thinking whomever did the tank delete may have snipped the wires or even tried to splice them which may be you backyard mechanic workaround
Each tank had a separate sending unit for the gas level . Check the wiring from the tank for damage or corrosion .
SOURCE: 1986 ford 250 pickup no gas from both gas tanks
I JUST SPENT A WEEKEND SOLVING THE ISSUES THAT SEEM TO BE THE SAME AS YOURS. FIRST THE PROCESS OF THIS MODEL IS THAT WHEN THE KEY IS PUT IN THE RUN POSITION, THE FUEL PUMPS ACTIVATE AND ONLY FILL UP THEMSELVES. WHEN THE TRUCK ENGINE IS CRANKED, THE OIL PRESSURE ACTIVATES THE SENDING UNIT AND IT ACTUALLY TELLS THE FUEL PUMPS TO KEEP PUMPING WHILE THE ENGINE KEEPS TURNING OR RUNNING. IT IS A SAFETY ISSUE, AS IN A WRECK, THE ENGINE DIES, AND THEREFORE THE FUEL TO THE ENGINE IS STOPPED, AS A FIX, TRY PRIMING THE CARB, AND SEE IF IT RUNS BRIEFLY. YOU WILL ELIMINATE ALOT OF EXTERRANEOUS ELECTRICAL ISSUES IF IT RUNS. NEXT, CHECK CONTINUITY AT THE FUEL PUMP RELAY. IT IS LOCATED UNDER A PLASTIC COVER ON THE FIREWALL TO THE RIGHT OF THE BRAKE BOOSTER PUMP. MINE HAS 5 WIRES GOING TO IT. I HAD TO UNSCREW THE COVER TO ACCESS THE HIDDEN SNAP THAT HOLDS IT IN PLACE. HAVE SOMEONE CRANK THE ENGINE AND FEEL IF THE RELAY ENERGIZES. IF IT DOESN'T, AND THIS IS WHAT WAS WRONG WITH MINE, YOU WILL NEED TO FIND AND REPLACE THE OIL PRESSURE SENDING UNIT WITH 2 WIRES. THERE ARE 2 WIRES THAT WILL LEAD YOU TO THE OIL PRESSURE SENDING UNIT FROM THE RELAY. THERE ARE 2 SENDING UNITS AND THEY ARE LOCATED AT THE REAR OF THE EXHAUST MANIFOLD, BEHIND THE CARB. THERE IS A BIG ONE, WITH ONE WIRE, WHICH IS THE OIL PRESSURE SENDING UNIT FOR THE GUAGES, BUT BELOW THAT IS ANOTHER SMALLER SENDING UNIT THAT HAS 2 WIRES GOING TO IT. IT CLOSES WHEN THE ENGINE TURNS OVER AND ACTUALLY TELLS THE FUEL PUMPS TO KEEP PUMPING GAS. SEE IF THIS WORKS. THE FUEL PUMP RELAY WAS 15 DOLLARS AND THE OIL SENDING UNIT WAS 16. SPENDING ALL WEEKEND WITH THE WIRING SCHEMATICS AND TRACING ALL OF THAT STUFF-----------PRICELESS.
SOURCE: 1966 Ford Mustang Gas Guage not working
I had a similar problem. In my 1966 Mustang gas tank, the fuel pick-up was on a "float." My float developed a hole, filled with gasoline, and sank to the bottom of the tank, therefore, the gauge always read empty, but the car ran well. All the other gauges of course worked correctly. The repair was a relatively simple soldering job (after removing the float from the tank), but if that is indeed the problem, ensure all the gasoline is drained from the float before beginning the soldering job.
SOURCE: 88 Ford F250 rear gas tank will not work
Sounds like the rear fuel pump in the tank is not working and the float or sender is bad also. check to see if the rear pump is working should make a humming noise.
SOURCE: gas tank/ gas gauge
What does your manual say that it is? Always check in your manual and you will have plenty of information to help solve your questions. However, I want to venture a guess about your gas gauge. You may have a computer mis-read and the new tank install is not interfacing with your computer.
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