AdventureDad
Junior Member
while chasing down an intermittent P0440 and gas cap code on my new to me 08 4.7L 1500 4x4, I inspected the hoses to the charcoal canister. I found a quarter sized hole in the leak detection pump air filter (black V8 juice can sized thing just up from the charcoal canister). Instead of buying one and waiting, I fixed it. Shade tree style. It had some dust and pebbles on it. Blew it clean with nitrogen, then I cut some thick flexible plastic, rtv’d the perimeter, being careful not to obstruct the hole, or suck any in. Put the new plastic patch on. More rtv on top to block any small holes. I covered it with mastic hvac tape. I wonder if that was the cause of my vacuum leak. I don’t even know what it really even does.
Hope it works!
Hope it works!
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