S-Class (W140) 1991-1999: 300 SD, S 350TD, 300 SE 2.8, S280, 300 SE 3.2, 300 SEL 3.2, S320, S320L, 400 SE, S420, 400 SEL, S420L, 500 SE, S500, 500 SEL, S500L, 600 SE, S600, 600 SEL, S600L, 500 SEC, 600 SEC

fueling problems...

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Old 03-04-2014, 12:42 AM
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fueling problems...

my car had been sitting for about three or more years until i bought her last week. she had been started off and on from time to time just to keep things fresh under the hood. first full tank of gas, i added seafoam to help clean the fuel system up and also help burn any possible water that may have been inside the tank. got less than 200 miles on a full tank of gas. the car also had a mis to it so i replaced all of the spark plugs with some NGKs. second full tank of gas, this time around i used BG fuel system cleaner in the gas tank. i feel the car runs much better but gas mileage has not gotten any better. what could be wrong? why am i not getting good gas mileage? even the mpg meter up top on the speedometer stays planted to the right on 0 mpg on a very light foot. the only time the needle goes to the left past 30 mpg is when i'm at a dead stop. somebody please help.
Old 03-24-2014, 09:57 AM
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sorry so late but it seems you have vaccum problems
Old 09-01-2019, 12:24 PM
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