Engine Will Not Shut Off

CauseCorrection
Electrical or Manual Fuel Shutoff Not Closing Verify solenoid is not being energized
by a short in the wiring. Check the linkage in the shutoff lever for binding. Check the
ability of the spring in the pump
to pull the lever to the shutoff position.
OK

Engine Running on Fumes Drawn into Air Intake.Locate and isolate the source of fumes.
OK

Fuel Leaking to Intake Manifold.Check for porosity between the fuel filter mounting to the intake manifold.