Had an 07 Dodge R1500 5.7 with a P0456. Evap leak small. I smoked it with the Super Smoker and it kept showing about a .025 leak. I couldn't see any smoke so I dropped the Tank to get a better. Smoked just the tank and evap lines and there it was leaking around the pump. A closer inspection and I could see that the O ring was tight but the pump had a bunch cracks all around the lip where the retainer ring clamps it to the tank. I couldn't see the smoke with the tank installed because there is a plastic cover on top of the pump assemble.
07 Dodge R1500 P0456 ? look here, with pictures
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