The part that bolts near the motor mount with 4 hoses is the thermostat. The fuel passes up two rubber lines to the metal pipe that hangs off the head where its heated by coolant. The way to disable it would be to remove all the rubber lines to the t-stat. What's leaking? There is an O-ring on the side of the thermostat that costs <$1 to replace. The t-stat itself is $20 as I recall.

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Brian Toscano