Question about 1986 Ford F 250

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1986 ford 250 pickup no gas from both gas tanks

1986 ford f250 pickup

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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.

Posted on Oct 22, 2008

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