Thread: P0455 Evap Emiss large leak

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  1. #1 P0455 Evap Emiss large leak 
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    check gas cap message then this...changed cap and purge valve 2 times and it came back on! What's next?
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  2. #2 Re: P0455 Evap Emiss large leak 
    Turbo is the way to go. Fivefingerdeathpunch's Avatar
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    Smoke test the entire system, easiest way to figure out where the leak is coming from.

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  3. #3 Re: P0455 Evap Emiss large leak 
    Killa Bee Scottydoggs's Avatar
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    could be a busted hose to the evap system to the tank or purge solenoid, or a rusted out line. my car the vent tube next to the filler tube was rusted apart. thats a huge ass leak.

    98 Buick Regal GS, F body brakes, Caddy STS wheels, tinted tails L36 bottom end, lightly ported heads, 1.95 roller rockers, headers, gen 5 N* 3.0 pulley, FSIC, 42 lb injectors, a BrandonHall rebuilt trans, DHP tuned and AEM water/Meth injection https://goo.gl/gpV5kW
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  4. #4 Re: P0455 Evap Emiss large leak 
    GT Level Member Gregorius's Avatar
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    Changed fuel pump/sender lately? Had the tank open? That damned-able gasket around the top of the pump ass'y will leak if not installed right..
    Dude! Full Service Manuals! 2004-'08 User manuals, full docs wiring diagrams trouble codes... go look.
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