THE SOLONOID THAT SSTICKS STRAIGHT UP UNDER THE FUEL LINES IS IN THE MAIN PMP HEAD AND IS THE FUEL CUT SOLONOID,(N02) 12 VOLT AT ALL TIMES WHEN IGN IS ON, THE ONE DOWN ON THE SIDE OF THE PMP IS THE TACH SENDING UNIT , I AM GOING TO HAVE TO MAKE A GUESS AT THE OTHER ONE STICKING TRAIGHT BACK , IN THAT IT LOOKS LIKE A VENT SOLONOID WHICH WOULD EXP, WHY THE LINES ARE RETURNING BACK TO THE TANK , THE GAS ENG THIS WOULD BE A VACC, OPERATED VLV BU THE DSL IT WOULD HAVE TO BE ELECTRIC, TO CONTROL TANK VAPORS AND RETURN LINE FUEL AT THE SAME TIME THIS IS JUST A WAG ON THAT ONE JERRY