ON CERTAIN TRUCKS, A MANUFACTURING ERROR IN THE FUEL-WATER SEPARATOR PREHEATER THERMOSWITCH MAY PREVENT THE FUEL PREHEATER FROM TURNING OFF IF THE IGNITION IS LEFT ON. IF THE IGNITION SWITCH IS LEFT ON WHEN FUEL IS ADDED TO THE FUEL- WATER SEPARATOR AT THE FACTORY OR DURING A FILTER ELEMENT CHANGE, A SMALL FLAME MAY OCCUR INSIDE THE FILTER COVER.
ON CERTAIN TRUCKS, A MANUFACTURING ERROR IN THE FUEL-WATER SEPARATOR PREHEATER THERMOSWITCH MAY PREVENT THE FUEL PREHEATER FROM TURNING OFF IF THE IGNITION IS LEFT ON. IF THE IGNITION SWITCH IS LEFT ON WHEN FUEL IS ADDED TO THE FUEL- WATER SEPARATOR AT THE FACTORY OR DURING A FILTER ELEMENT CHANGE, A SMALL FLAME MAY OCCUR INSIDE THE FILTER COVER.