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Re: Need help with the EVAP system!!!
So far every P0446 I've dealt with on these has been dust and or bugs plugging up the vent filter. The dust get past the foam filter and ruins the valve
IIRC GM has an updated vent valve with longer hose to draw fresh air from gas cap area and a cyclonic canister
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Man rule #77...if you own a 67 stepside with a caddy 472 you will never be in danger of loosing you man card
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