Originally Posted by RegisteredUser
Its not the fuel that goes into the tanks of reputable fuel suppliers. Its those fuel suppliers tanks.
The best ones filter from tank to pump, at the pump, whether in states or other...
Some truckstops filter but i dont see that for most land based furl suppliers...gas stations
Actually, its the fuel dealers with a high turnover of fuel, wherein the fuel is constantly diluted with 'fresh' uncontaminated and water free fuel, are the 'reliable' sources. This would be sources that are pumping 90% of their storage capacity per month. This would exclude almost all marinia where the fuel sits around for months before being pumped; only those marinas that service commercial or mega yachts should be considered reliable sources.
The reason for all this is that diesel fuel has a relatively short 'shelf life' when exposed to atmosphere ... drawing down of fuel from field tanks accelerates the aspiration of fungals (cladosporiiums) into the field tank vent. Moisture quickly equilibrates into the fuel through the field tank vent and open boat tank inlets when fueling and then through the boats tank vent. Most particles in diesel fuel are simply the agglomeration (growth of particles by electronic surface attraction into larger and larger particles).
Unless diesel fuel is hermetically sealed in containers, once open to the atmosphere the shelf life is only about 45-90 days before the contamnation starts to really accelerate to grow/agglomerate into a contamination bearing possibility.
Rx: buy your fuel only from high turnover sources*, do not 'top off' your tank but only take onboard what you will USE in a nominaly short time ... plus some reserve, Empty the tank for long term storage.
When buying fuel, FIRST step should be a test for contamination: pour some of the fuel into a clear glass container, then hold that glass ... full of oil up to strong light .. the glass between your eyeball and the light source and denote any 'haze' in the fuel. If haze, then the resident particles are already at 5µM or greater ..... and you should close down and look for a 'reliable' source with 'fresh' fuel.
*buy your fuel at a high turn-over truck stop and 'jug-it' in to your boat.