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Coat your O-rings in silicone grease it won't damage the rubber but I would suggest viton O-rings to protect from this "new diesel".

I get mine at the local hydraulic repair place. Also folks you really do need to replace the rubber hose on any 8.3 and 250 cummins as they are a vacuum system up to the motor. I have seen hundreds of trucks that lines look good but when pressurized leaked like the were made of screen.

Joesco what truck are you working on? 931a0, 931a1, 931a2? Double check that the gasket on the canister is in place and that there's only one on there.

Okay Drew you are not getting the picture the Schrader valve is to let air in or out of the system like a petcock, not inside the line for fuel flow. Also the only place I have seen them was on the bolt that holds the canister on. I wouldn't change out any of the petcocks for Schrader valves, a...