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Old 07-25-2013, 12:44 AM
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ROLLGUY ROLLGUY is offline
ROLLGUY
 
Join Date: Oct 2007
Posts: 6,855
That is the fuel thermostat bypass valve. It is hooked up to the fuel heater loop, and bypasses the fuel when it gets up to temp (not sure what temp). It is useful in cold climates if working properly, but I usually abandon it and the fuel heater loop and run the hose directly from the hard line to the lift pump.
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