pcman_jh
Senior Member
- Joined
- Apr 11, 2003
- Messages
- 317
- Reaction score
- 1
- Location
- Haddington
- Your Mercedes
- 2013 E220 Cabriolet
I've suspended all tests. The car wouldn't start again (C250 Mercedes) with about a 50% mixture in the tank. I thought this might have been down to the O rings shrinkage letting in air, which it probably was to a degree, but I've changed almost all O rings.
My conclusion for an unmodified vehicle is that once you can get it started first thing in the morning, it's absolutely fine. The first starting is not consistent either - I can go 3 days without any signs of a hitch, but then on the 4th day it doesn't fire (it actually fires for a fraction of a second then dies. If this occurs it means it isn't intereted in starting without priming the fuel filter with pure diesel, after which it's fine for the rest of the day).
Long term I can see the only solution is a dual tank setup. Diesel for first start of the day, then switch over to a mixture for the rest of the day.
My conclusion for an unmodified vehicle is that once you can get it started first thing in the morning, it's absolutely fine. The first starting is not consistent either - I can go 3 days without any signs of a hitch, but then on the 4th day it doesn't fire (it actually fires for a fraction of a second then dies. If this occurs it means it isn't intereted in starting without priming the fuel filter with pure diesel, after which it's fine for the rest of the day).
Long term I can see the only solution is a dual tank setup. Diesel for first start of the day, then switch over to a mixture for the rest of the day.