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  1. #1 Re: poor MPG after tune up 
    SE Level Member christopher8911's Avatar
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    Quote Originally Posted by 01GTP View Post
    Check the spark plugs. Check your fuel pressure regulator.
    How do I check the fuel pressure regulator?
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  2. #2 Re: poor MPG after tune up 
    The mod from over yonder TheOtherNick's Avatar
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    Quote Originally Posted by christopher8911 View Post
    How do I check the fuel pressure regulator?
    Was there some gas in the vacuum line connected to it? Do you have a vacuum pump? If you do put about 25" of vacuum to it and see if gas leaks out.
    01 gtp-big cam e85 dd 78dodge- guzzling fuel 05 cummins- rollin coal
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