My 1978 240D won't start. I had blackish specks in my fuel filter. I took out the screen in the tank and it was cruded ; cleaned and reinstalled the screen and put in a new o-ring. Replaced both fuel filters. Put BioBor in the fuel. Still won't start. How does fungus stop the car from running? I saw on the bottle of BioBor a note about for best results wait 2 or 3 days. Is there black specks clogging my IP and or injectors? How long should I give the Biobor to work?
Thanks,
Dan

Black specs will never get to the IP or Injectors, You have the primary and secondary filters to catch them......they will clog so carry several spares and tools to change them. I would use Biobor at least the next 4 tankfulls, and every 2 for the next year....

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Proud owner of ....
1971 280SE W108
1979 300SD W116
1983 300D W123
1975 Ironhead Sportster chopper
1987 GMC 3/4 ton 4X4 Diesel
1989 Honda Civic (Heavily modified)
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"He who fights with monsters might take care lest he thereby become a monster. And if you gaze for long into an abyss, the abyss gazes also into you." - Friedrich Nietzsche

I still don't understand why fungus will cause a diesel not to start then. If the car won't start I'll never use a tank of fuel.

You probably clogged your filters and the fuel flow was blocked. When you opened the fuel lines to check screens and replace filters you got air in the lines. When you can restore fuel flow and purge the air out of the system, you will likely be running if you don't have other problems.

Did you pump the heck out of the primer after changing the filters? Do you have the old style (screw down handle) primer pump? If so, does it leak? If it leaks fuel out, then it leaks air in. More than one car has changed hands because of a leaking primer pump preventing starting.

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Rick Miley
2014 Tesla Model S
2018 Tesla Model 3
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Former MB: 99 E300, 86 190E 2.3, 87 300E, 80 240D, 82 204D Euro
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When the fungus breeds in the water/diesel interface, they produce strings of slime. Biobor kills the critters, but their slimy bodies get sucked up into the fuel system and clog filters. They can't get by the filters, so the injectors shouldn't be affected.

Sounds like you just need to get the air out of the lines, or you got lots more critters.

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1984 300Sd 210k

Former cars:
1984 300D 445k (!!) (Strider) Original (and not rebuilt) engine and transmission. Currently running on V80 ( 80% vegetable oil, 20% petroleum products). Actually not, taking a WVO break.
1993 300d 2.5 275k. Current 120/day commuter
1981 300SD 188k (Hans) Killed by a deer

When I change filters I always fill the new ones with fresh fuel; it saves a lot of pumping-in fact I don't pump at all. I've had plenty of practice, especially with the pre-filter, as I've been getting a lot of black flaky particles there. I'm burning 90% WVO filtered to 0.5 micron and 10% RUG.

Just a thought, but also check and make sure the tank vent is clear. The simplest way to check is leave the fuel cap off. If it then starts or runs better, chances are the vent line is clogged.

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85 300CD
83 300TD
78 240D (daughter)

1984 300D TURBO 155K
USE STARTRON BLUE ANY BOAT SUPPLY,HAVE GOOD POWER

Wow a 6 year old thread!

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Vehicle never started and is long gone.

Look at RAYMOND485's posting history. Since he joined in 2005 all he does is make useless 2 line posts to randomly selected very old dead threads.

Hmm similar to what whunter does.
perhaps he's searching for information on something wrong on his car and this is his way of helping out the forum.
oh, and I found a 5 line answer on one of his threads...
they're always caps though... kinda annoying.

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John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread
"as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do!

My drivers:
1987 190D 2.5Turbo
1987 190D 2.5Turbo
1987 190D 2.5-5SPEED!!!

1987 300TD
1987 300TD
1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!

whunter brings up topics that help people he is working with or that would help many people. Raymond just makes very short responses to threads that have usually been, like this one, long ago resolved or dropped.

Why are we still posting to this thread?

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1983 Benz 240D - 263,060 (Current)
1983 Cadillac DeVille - 130,000 (Scrapped - Stupid HT4100)
1992 Dodge B350 - 150,000 (Sold)
1984 Mazda 626 - 299,997 (Scrapped)