Feels/looks gritty. Like dirt. I remember getting fuel one time where I normally do and the pump was REALLY slow. Like 4 gallons in 5 minutes slow. I was probly suckimg the crap off the bottom of the under ground tank.

I would like to do some biocide for good measure, the car sat for 7 years before I bought it, but that was 1 year and 8k miles ago.

Where can I find biocide?

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'92 300D 2.5
'99 E300TD