I can only wonder what that WVO is doing to the poor engine.

I'll bet if you were running diesel, like is intended....you'd not be having any of these issues.

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'16 E400 4matic Sedan - 148k - Brothers (OC-155k)

Ooops, I missed the post about a single tank WVO system. I consider my troubleshooting tips inapplicable.

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1977 300d 70k--sold 08
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1984 307d 126k--sold 8/03
1985 409d 65k--sold 06
1984 300SD 315k--daughter's car
1979 300SD 122k--sold 2/11
1999 Fuso FG Expedition Camper
1993 GMC Sierra 6.5 TD 4x4
1982 Bluebird Wanderlodge CAT 3208--Sold 2/13

I have pumped the primer a lot and it does not help this problem. I can try to pump it until my hand bruises next time.

I have not put the alternate fuel supply in the engine bay and tried that in quite a while. That is a good idea.

OK, so I wait for it not to start and then I will check to see if the gp's are getting current.

Good, Great Help Guys',
Zack

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1984 300D Turbo
1980 300SD Sold
1983 300TD Sold
Dagger 16 ft. Legend Canoe (for the weekends)
Marin Northside Trail Mtn. Bike

why not try running it on the fuel it was intended to run on?

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did you de-water your VO? My guess is your IP is about to fail

I have noticed lately a lot of these problem posts are related to people running WVO

EDIT-Perhaps we should have a subforum for WVO related problems, as the troubleshooting for an engine run on diesel as opposed to WVO is quite different.

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2005 SL65
1999 E300
1995 E300
1994 SL320
1988 560SL
1987 300TD
1982 300D
1955 300SL

X2. That's why I decided my troubleshooting tips were inapplicable. Too many stories of people using WVO running into no-start conditions when their IP is failing. I have no idea how a person would test to see if their IP was on the brink from running WVO. I seem to recall some comments about the viscosity of the fuel when cold overcoming the poor performance of the IP and warm thin fuel pushing the IP over the brink.

__________________
1977 300d 70k--sold 08
1985 300TD 185k+
1984 307d 126k--sold 8/03
1985 409d 65k--sold 06
1984 300SD 315k--daughter's car
1979 300SD 122k--sold 2/11
1999 Fuso FG Expedition Camper
1993 GMC Sierra 6.5 TD 4x4
1982 Bluebird Wanderlodge CAT 3208--Sold 2/13

that would make sense considering how the pump operates.

diesel #2 all the way

sometimes one if its really cold

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Current
2006 E320 CDI, 57K bought at 67K "Liesl"
1986 190E 2.3-16, 198K bought at 56K "Brigitta"
1987 300TD (Chuggin Along), 292K "Friedrich"
1995 E320 Wagon, 200K "Louisa"

Past
1987 300SDL, (sold) 125K, bought for 1$ "Kurt"

My guess is either water got into the pump or the seals are gummed up with WVO residue. This could cause intermettent problems as the OP has described. I cannot see how letting viscous VO sit in the crevices of the IP can not be blamed for at least part of this problem. It would be useful to see if the OP uses some sort of blend or just pours a bunch of waste oil into the tank. Either way there are several key pieces of information missing to make an educated postulate about what exactly is going on here.

__________________
2005 SL65
1999 E300
1995 E300
1994 SL320
1988 560SL
1987 300TD
1982 300D
1955 300SL

Try removing the cap next time this happens. Or just try removing it when you shut the car off. If you hear an inrush of air, well, the vent is probably clogged.

Does this only happen when the tank is full? Worse when full? empty? The problem is almost certainly fuel related. Maybe when something gets warm under the hood, it loses its seal and allows air to enter the system. The car runs fine until the point when you turn it off and then it will not restart???

Jay.

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'87 300TD 225k mi.
Cannondale 66cm CAAD5 w/Campy/Jamis Aurora
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x2. This is a diesel engine. Not a garbage disposal. Stop using that garbage fuel, that's the first and foremost problem I see here. So many perfectly good diesel MB's have been destroyed by this horrible wvo crap.

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'98 E300 turbodiesel