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Old 07-23-2004, 09:32 PM
Chris Bell's Avatar
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Join Date: Oct 2003
Location: Santa Clara, CA.
Posts: 752
B100 Issue

I posted this in a different topic last week and somebody suggested thatIstart a new topic with it, so here goes...

The car..1981 300SD with 141,xxx miles
The situation...Car was running good, it would start after just a couple of turns no matter how cold it was, ran good. It does smoke a bit under acceleration. With the car in the condition listed above I put a full tank of B100 in. While B100 was in the fuel tank the car was virtually impossible to start. Once it started it ran good. It got so bad that once I had it running I just kept driving it until the tank was empty and I could replace the B100 with #2. Now about 4 months later, and quite a few tanks of #2, the car is still difficult to start when it's cold. Since I ran the tank empty of B100 I have replaced both the secondary and primary fuel filters and ran a couple cans of diesel purge through it.

Anyone have any sugestions as to why the car is still hard to start when it's cold?

I'm sick of .sig files
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Old 07-23-2004, 10:05 PM
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Join Date: Apr 2004
Location: Central NY USA
Posts: 32
If it's still starting poorly after running several tanks of Regular fuel through it, I would suggest using the normal diagnostic routine for the symptoms you describe.
Check glow plugs
Check compression
Check Injectors
Check Prechambers

It is possible the change was coincidental, and not related to the Biodiesel.

1978 300SD
Running Biodiesel/SVO, 2 tank system
127,000 Miles
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Old 07-24-2004, 03:03 AM
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Join Date: Sep 2003
Location: Santa Barbara, CA
Posts: 471
Did you check the fuel tank strainer?
'81 300TD Wagon 355k (Miss Diesel)
'83 300SD 180k
'84 500SEL 190k (Parting it out)
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Old 07-24-2004, 09:11 AM
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Join Date: Sep 2001
Location: central Texas
Posts: 17,277
In addition to the things mentioned above...
Check start of fuel timing...
Check Chain elongation and valve timing by using the movement of the number one intake valve ..... the factory shop manual SPECIFIES THIS PARTICULAR PROCEDURE if one has a " PERFORMANCE COMPLAINT" .....
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Old 07-24-2004, 10:58 AM
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Join Date: Jan 2000
Location: PA
Posts: 5,440

Remove the fuel cap from filler pipe. Remove the rubber fuel line from the steel fuel line below the fuel tank. Fuel should run out in a steady stream. If it doesn't, your fuel tank strainer is plugged.

If strainer is plugged, remove it and clean it. Best way is to remove fuel line attached to strainer and blow it clean with compressed air. Best time to do this is when tank it almost empty. Drain fuel tank thru fuel hose you removed into a container, fuel can be reused. Strainer does not have to be replaced unless the mesh is broken. Put in a couple a couple gallons of fuel and check for leaks. Its possible you might have to replace the seal on the strainer if there are leaks around the strainer.

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Old 07-24-2004, 05:13 PM
Rick Miley's Avatar
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Join Date: Jun 1999
Location: Land O Lakes, FL
Posts: 3,086
Re: B100 Issue

Originally posted by Chris Bell
Once it started it ran good. ...difficult to start when it's cold.
Let's not overlook the obvious here. Check for malfunctioning glow plugs.
Rick Miley
2014 Tesla Model S
2018 Tesla Model 3
2017 Nissan LEAF
Former MB: 99 E300, 86 190E 2.3, 87 300E, 80 240D, 82 204D Euro
Chain Elongation References
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Old 07-24-2004, 08:03 PM
phantoms's Avatar
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Join Date: May 2004
Location: Savannah, GA
Posts: 794
And last but not least, check and make sure the tank vent is clear. You can do this by seeing if it starts easier with the fuel cap removed. If you here vaccuum (or pressure) release when removing the fuel cap, it's a good indication of a clogged vent line.

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