Diesel Treatment

I have suffered Diesel bug in 2 yachts. And I have cleaned tanks and lines. I used to use Anti diesel bug treatments up until 2022. 

Our Diesel in Cowes harbour has no added Ethanol, but I sometimes fill elsewhere when it may be E5 or E7. 

Then I had the idea to fitt a Dessicator in the tank vent line, this effectively dries the air incoming. preventing condensation in tank, I pull the inspection cover off tank every year and the tank remains clean bright pink bug free fuel. 

Evey winter at service time I check the dessicator and about half of the silica gel changes colour [at the atmosphere end], indicating it needs drying [2-4 hrs in oven at 90 degC]. When filling the tank the Diesel foams up and can coat the silica gel, so I installed valve to shut of the dessicator and let the tank vent breath direct to air, then after the foam dispears switch back to breath only through dessicator. The dessicator is a standard filter container in clear plastic with 1/4" diameter push on pipes. see attached photos.

What sort of material did you find in your fuel filter system?

That piece of black tar should not be in any fuel system on a modern diesel engine.

Since the advent of Ethanol added to diesel,  many bulk storage tanks are being fitted with dessicators on the breather tube, or the more expensive option,  a dry nitrogen blanket of gas in the tank.

 I'm just saying my solution it is cheap, simple, and it is a good idea.