Friend has 95 E300. When first purchased, was getting clogged fuel filters every several thousand miles (was told fuel tank likely contaminated)....although recently car has gone about 10,000 miles without a change. He suspects car wasn't driven much by previous owner, so I'm recommending using a biocide (like BioKleen) to address the issue decisively.

My question: if there are microbes/fungi in the tank, and if a biocide is used, does the crud simply dissolve and thus not clog the filter? Or does the biocide simply loosen stuff up, thus making it likely that the filters will clog?

Thanks.

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14 E250 Bluetec 4Matic "Sinclair", Palladium Silver on Black, 159k miles
06 E320 CDI "Rutherford", Black on Tan, 178k mi, Stage 1 tune, tuned TCU
91 300D "Otis", Smoke Silver on Tan, 145k mi, wastegate conversion, ALDA delete

19 Honda CR-V EX 75k mi
Fourteen other MB's owned and sold
1961 Very Tolerant Wife