evap leak on 2004 ram 1500 4.7 I have changed all hoses under hood purge pump gas cap and hose under cab and the engine light still comes on code shows small evap leak. I need help any other suggestion or help Im going crazy tring to fix this,Dealer wont to charge to much. this will be a last resort
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Originally Posted by Sixtysixdeuce
(Post 1354737)
Ideally, you use a smoke machine to test for evap leaks. Since most guys don't have that little $1000 piece of equipment, all you can do is physically inspect fuel cap, solenoids, charcoal canister and all connecting hoses inch by inch. Bad fuel caps (or loose, missing) are the #1 cause for evap leak DTC's, but I've seen plenty of cracked lines and melted purge valves. Also see lots of stuck vent solenoids in dusty areas.
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