Should I use Teflon Tape or Thread Sealant on both sides of the Adapter when installing the Fuel Pressure Sensor to the Factory Bleed Screw?

 Teflon tape is not required on the Duramax 6.6L Fuel Pressure Adapter as it uses an O-ring to seal. The sensors come from the manufacturer with thread sealer already applied. However, over time if the sensor is removed then you will need to reapply some.

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