the side of the engine next to the tank. Its operating
contacts are normally closed. If engine temperature rises
above 240" F, the switch contacts open, de-energizing the
fuel stop solenoid and stopping the engine. The switch
closes again at about 195F.
Make sure engine temperature is below
195 `F before attempting this test.
located behind the engine shroud door. The switch is
normally open. As the engine is cranked over, the switch
contacts close, completing the circuit to the fuel stop
(a) Open the engine junction box and
disconnect the two high temperature switch leads. These
leads should be marked with the number 35 on a band
(3) If oil pressure drops below approximately 13
psi, the switch opens the fuel stop solenoid circuit and the
engine will stop.
(b) Using a continuity tester, test for
continuity of the high temperature switch. If tester
(4) If fuel flow from the tank stops due to no fuel,
indicates there is continuity, the switch should be okay. If
a clog in the fuel line, or a short in the solenoid circuit, the
the tester shows that there is no continuity, the switch is
fuel stop solenoid will de-energize. The engine will stop.
defective and must be replaced.