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#1
05-18-2023, 12:34 PM
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Fuel Filters getting fouled quickly. 1991 250TD.
Just a dumb question.
My 1991 250TD seems to foul it's fuel filters pretty quickly. It's my third vehicle, gets driven at least monthly, drives wonderful right after i've changed the fuel filters, but it seems like i'm having to change the fuel filters very frequently. I can tell when I need to change them because it's down on power, struggles to rev smoothly, and idles a bit rough (for a 5 cylinder naturally aspirated diesel.) I keep inline and primary filters in the vehicle and am down to being to change both in 10 minutes. even with a hot engine. I order them in sets of 5. Is there something I could/ should be doing? I'd like to not have to change the fuel filters more frequently that the oil changes. A friend has a Nissan Caravan Silk Road diesel, and he mentioned a water separator was among the things he ordered. Could that be one of the issues? Water in the diesel? I only fill up at Buc- ees and sell a ton of fuel, so i know it's fresh fuel going into the vehicle. Thank you for your thoughts. 
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#3
05-18-2023, 12:57 PM
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X2 ^ It's most likely algae. Algae looks like dark colored rust flakes in the filter. If it were mine I'd treat it with BioBor or something similar and keep changing filters until it clears. High volume fuel vendors are a good choice. The water separator isn't necessary but definitely will not hurt anything and could help.
Good luck!!!
__________________
"Rudeness is a weak man's imitation of strength" - Eric Hoffer
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#4
05-21-2023, 10:49 AM
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Definitely cut open the clear filter and spread out the contents on a sheet of paper.
Rinse off the debris with alcohol and see what is there… If it is metallic, you might need a fuel tank lining, or new tank. If it is slimy or flakey critters is likely, and a strong treatment with biobor, then power service clear diesel, and lots of filters to catch the freshly killed… Star Tron has a good rep of breaking down the critters and getting them passed through the filters.
__________________
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!
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#5
05-25-2023, 01:31 AM
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Star Tron (starbrite) fuel additive for diesels is supposed to have an enzyme that breaks up anything growing inside of your fuel tank into particles small enough to pass through your filters.
However, it is still a good idea to keep a few filters in the trunk just in case the die off overwhelms the filter. "Known as "diesel algae" these are primarily fungi, yeast and mold contaminants. If left untreated, diesel algae will ruin the fuel causing clogs in filters, fuel lines and injectors. Common treatment for this problem up until now has been the use of a biocide to kill existing growth and prevent a future infestation. The use of a biocide can however cause other problems. Once the growth is killed, the resulting biomass settles to the tank bottom where it decays forming organic acids. The acids then deteriorate the fuel and cause corrosion of the tank walls, injectors and fuel delivery system. Additionally, biocides can be harmful to all those who handle them or come in contact with treated fuel, plus they can cause environmental damage if spilled. Star TronŽ uses its enzyme technology to disperse microbial growth throughout the fuel. These microbial particles are then either safely burned away or filtered out." Reading further it goes on to speak of water in the fuel. https://defender.com/assets/pdf/star-brite/startron_story.pdf
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84 300D, 82 Volvo 244Gl Diesel
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