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Old 09-21-2002, 11:33 PM
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csnow csnow is offline
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Join Date: May 2002
Location: Mass
Posts: 1,127
Likely the fuel pump itself.

Bad relay unlikely to be helped by whacking on the pump cover.

Seen the same failure mode twice now on 2 different 300Es.
Whack on the pump, and it starts. Goes a while, sometimes a long while, sometimes not, randomly stops, whack it again....
gets you home eventually...

Suggest an OEM Bosch pump. I made the mistake of buying a slightly cheaper (and available on a Sunday) pump from AutoZone.
Works ok, but fits poorly, and it's much louder.

Best of luck.
1986 300E 5-Speed 240k mi.
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