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Go Back   PeachParts Mercedes-Benz Forum > Mercedes-Benz Tech Information and Support > Diesel Discussion > Alternative Fuels

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  #1  
Old 06-04-2014, 11:37 AM
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After many thousands of WVO (blended) miles, the car will only run on pump Diesel

My bro's 1991 300D 2.5 Turbo was running great on WVO/RUG blend for thousands of miles, but now it will only run on 100% pump Diesel without issues. I/we have tried everything. The injectors were rebuilt by greazzer (forum member), but no change. Just for grins, yesterday I put 5 gallons of blend in the nearly empty tank, and topped it off with Diesel. I had to drive home at a very slow speed with the flasher on. It has very little power, and will not rev up. It idles great (and quieter), but still no power. I may have to drain out the entire load of fuel and fill the tank with straight Diesel. Anyone got any ideas? I have always been able to figure out the fuel problems over the years with the many Diesels I have had, but this one has me stumped......Rich
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  #2  
Old 06-04-2014, 02:58 PM
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Sounds strange. Since the engine still runs fine on diesel, logic suggests that the engine and fuel system haven't changed, so perhaps the WVO you are getting has changed. Is it from the same lot? If so, has the stored WVO changed, like gelled a bit?
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  #3  
Old 06-04-2014, 03:20 PM
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I assume a single tank system so my suggestion is viscosity. Check for slightly plugged line, slight constriction, filter plugged. Small wear spot in fuel line. One that doesn't leak liquid, but sucks air. I would check vacuum in the line with diesel and WVO blend. I have had each of these happen over the years. The vacuum increase created from the higher viscosity blend would not shut you down, but would restrict flow enough to limit acceleration.
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  #4  
Old 06-04-2014, 03:24 PM
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i'd be inclined to check the fuel pressure. The lift pump may be on it's last legs. good enough to lift the diesel but strugleing with the blended
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  #5  
Old 06-04-2014, 08:29 PM
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It has an auxiliary electric pump, and it makes no difference if it is on or off. I have been running the same fuel in every other car I have (my bro as well-3 other cars), with no problems. I did pinch off the return line, and it did a little better, but still no power. I suspected the relief valve, but it should have ran fine after pinching off the return line. I will need to drive it on short trips that I don't need to be in a hurry, and still maybe have to drain the tank in order to put in straight Diesel. My bro and I have checked the vent, tank screen, filters etc, and all are clean. Like I say, this one has me stumped.....Rich
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  #6  
Old 06-04-2014, 08:37 PM
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Have you verified that the electric pump is working?
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  #7  
Old 06-04-2014, 08:53 PM
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Quote:
Originally Posted by Phillytwotank View Post
Have you verified that the electric pump is working?
Yes, yesterday. It is mainly used to prime the filter after changing. I put the fuse in when I want the pump to run when the ignition is on.
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  #8  
Old 06-04-2014, 09:43 PM
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Change the filters or swap them from a good running car from your fleet.
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2012 S350 BlueTEC 4Matic
2007 ML 320 CDI
2007 Leisure Travel Serenity
2006 Sprinter 432k
2005 E320 CDI
1998 SLK230 (teal)
1998 SLK230 (silver)
1996 E300D 99k, 30k on WVO
Previous:
1983 240D, on WVO
1982 300D, on WVO
1983 300CD, on WVO
1986 300SDL 237k, 25k on WVO (Deerslayer)
1991 350SDL 249k, 56k on WVO - Retired to a car spa in Phoenix
1983 380 SEC w/603 diesel, 8k on WVO
1996 E300D 351k, 177k on WVO

2007 ML320 CDI .. / 2005 E320 CDI .../ 1998 SLK 230 .../ 1991 Daihatsu Rocky
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  #9  
Old 06-04-2014, 10:30 PM
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Hi Rich, I suspect it is the tank strainer or an air leak somewhere along the feed. This is what I would do to at least to eliminate that possibilities.

1) Rev car up and see whether you have bubbles going into the primary filter.
2) Run the car with a bottle of diesel under the hood. If it runs well then swap it with WVO or your blend. It should run just as well.

If the car still has no power then I will be stumped too. It does not make sense that it has no power with your blend or WVO. The car does not know any better except it is to do with viscousity or it is starving of fuel for some reasons.
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  #10  
Old 06-04-2014, 11:15 PM
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Quote:
Originally Posted by GregMN View Post
Change the filters or swap them from a good running car from your fleet.
I can't swap, as it is different than the one used in 61X engines (I have plenty of those to choose from). Yes I could try changing the filter, but my bro has tried that several times in the past. He told me it would not run on anything but Diesel, and I did not believe him. I too thought it might have been his fuel, but his other cars run great on it.
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  #11  
Old 06-04-2014, 11:20 PM
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Quote:
Originally Posted by ah-kay View Post
Hi Rich, I suspect it is the tank strainer or an air leak somewhere along the feed. This is what I would do to at least to eliminate that possibilities.

1) Rev car up and see whether you have bubbles going into the primary filter.
2) Run the car with a bottle of diesel under the hood. If it runs well then swap it with WVO or your blend. It should run just as well.

If the car still has no power then I will be stumped too. It does not make sense that it has no power with your blend or WVO. The car does not know any better except it is to do with viscousity or it is starving of fuel for some reasons.
Already looked, no bubbles in the primary. I just got through pumping all the fuel out of the tank, and will put 5 gallons of D in tomorrow. I will get it running, and then try it on a can of the fuel I took out, plumbed directly to the lift pump. That will remove the tank and fuel lines from the system. I need to start ruling out components....Rich
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  #12  
Old 06-05-2014, 07:51 AM
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using the vehicle's tank,will bring misery.Took me 2 years of cleaning primary filter every 150 miles,to get rid of animal fats that stuck to tank walls.I even had tank cleaned out,still had chicken skin from time to time.
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  #13  
Old 06-05-2014, 06:23 PM
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What are your "blend" percentages WVO/RUG ?
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Greg
2012 S350 BlueTEC 4Matic
2007 ML 320 CDI
2007 Leisure Travel Serenity
2006 Sprinter 432k
2005 E320 CDI
1998 SLK230 (teal)
1998 SLK230 (silver)
1996 E300D 99k, 30k on WVO
Previous:
1983 240D, on WVO
1982 300D, on WVO
1983 300CD, on WVO
1986 300SDL 237k, 25k on WVO (Deerslayer)
1991 350SDL 249k, 56k on WVO - Retired to a car spa in Phoenix
1983 380 SEC w/603 diesel, 8k on WVO
1996 E300D 351k, 177k on WVO

2007 ML320 CDI .. / 2005 E320 CDI .../ 1998 SLK 230 .../ 1991 Daihatsu Rocky
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  #14  
Old 06-05-2014, 08:56 PM
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My first line of defense would be to run a bottle of diesel purge. Take off the fuel in and the return line and add them to a jar with the diesel purge in it. Rev up the engine also. It probably has goo in the injector pump and tank and probably the lift pump. But it is the IP that is keeping it from running right.

You might not believe this but for what you spend to blend you could do a basic two tank conversion on many cars and recoup the cost in less than a year. Even if you do not drive that far and even if you have four cars. It usually on only take ten thousand miles. Just my 2 cents.
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  #15  
Old 06-05-2014, 09:48 PM
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Quote:
Originally Posted by GregMN View Post
What are your "blend" percentages WVO/RUG ?
80/20-75/25 in winter, 90/10-85/15 summer. None of the other 6 vehicles between my bro and I have a problem with this ratio.
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