What the heck is that?

Is it that evil algae? If so you had better clean your tank as it grows in there and you will be changing filters forever.

Davoe,

Are you living in a Bigamous relationship, or do you also have to answer to the Mother-in-law, the daughters, and the bitch (puppy dog) as well as your spouse?

Davoe,

Diesel or Petrol?

I have no experience with algae in petrols but I've seen quite abit of it in diesels. (although never in a car, only big machines and boats).

There are several types and I have seen it as you describe. like grey snot. I've also seen it looking like dark rust.

Fair chance it is algae because your normal fuel would quickly strip anything else away. Shouldn't be a great problem if it is algae. You simply need to get rid of the water in your tank. Water is the catalyst so a quick tank drain and new filter should get it out of the system. Atleast a 100 litre odd 4WD tank is abit easier to empty than a 3000 litre boat tank!

Anyway, hope that helps.

Andrew

Has it been cold where you are? Chances are it is parrafin wax. I had heaps of trouble this year with our tractors. I bought in a load of diesel in feb/march this year and all was fine until the cold weather hit. Turns out there is summer diesel, winter diesel and alpine diesel. Summer diesel will wax up in the filters and the tank on cold mornings. Once it warms up later in the day the wax melts/dissolves and no more problems until the next morning. You can add kerosine at 5% I think. Not 100% sure now but i think that was the rate Shell told me to use.