I just bought a 1993 F150 XLT ...TRUCK WAS RUNNING GOOD AND STILL IS BUT YESTERDAY I TRIED THE DUAL FUEL SWITCH AFTER I FILLED UP BOTH TANKS ..NOW THE TRUCK WONT ENGAGE WHEN THE SWITCH IS ON THE FRONT TANK...WHEN I SWITCH OVER TO REAR TANK IT STARTS UP NORMAL AND NO PROBLEMS...ONCE I DRIVE AWAY I SWITCH OVER TO THE FRONT TANK AND THE CAR RUNS FINE ...JUST HAVING PROBLEMS STARTING UP ON THE FRONT TANK...WHAT COULD THIS BE...PLEASE HELP ...

THANK YOU
GOD BLESS

 

CAPS LOCK MUCH? Im betting its the sending unit.