Uncle Benz
Senior Member
- Joined
- Mar 31, 2006
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- 4,223
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- Age
- 53
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- West Sussex
- Your Mercedes
- Mainly Mercedes
In my opinion it is worth draining, refilling and giving it a try first. My only caveat with that is the om651 high pressure pumps do not seem as tolerant of petrol contamination as the older design of pump fitted to om646 and the like. I have seen pumps destroyed on these by misfuelling along with the same type of recent pump fitted to BMW and VW. If the pump has gone you will be replacing it, all injectors, both ends of the fuel rail, filter and having a proper clean of the tank and all fuel lines. No half measures. Its gonna be a big bill, so nothing to lose by trying a drain and refill first