Once you get the tanks clean you can reduce the likely hood of recontamination by keeping your tanks topped up whenever possible. When tanks are less than (mostly), full the moist air will quickly convert your tanks to a reasonably efficient watermaker - which settles to the bottom of the tank. This is where the critters thrive. A good diesel additive which contains a biocide (I like PSP, Soltron etc.) will help as well. The Algae X magnetic filter element also gets good results. Since 9 out of 10 engine failures can be traced to fuel problems (having twins won't help much), any and everthing you can do, you should do. Bottom line, the best prevention is run the boat a lot and keep adding fresh fuel (not always an option).
More realistically, your sludge is made of several things, including the settling out of ashphaltine components which are present in all diesel fuel.
If you get a clean, glass jug,of about 1 gallon, fill it with diesel and screw the lid on, and set it in a closet,undisturbed, this substance will settle out, leaving black goo on the bottom, in time. Motor oil will do the same.
Diesel is considered 'fresh' for only 100 days or so, starting at the refinery where it is made.
Water, bugs, and the ashphaltines can mess up a tank pretty badly. What would help a lot is the Soltron plus agitation. No real easy answers, other than additives, filtration, and agitation. This problem is non-existant for applications that require refueling every couple of days, such as diesel ferry boats, etc.
I once had to deal with 1600 gallons of black jello in a tank...no fun at all, but I was saved by the boat builder, who built in a 24inch port in the side of each tank compartment. One on each side of the baffles, three in that 1600 gallon tank.
AVAILABILITY: Bell's DEE-ZOL is available in 8 oz., 16 oz. and 32 oz.bottles, 1 gallon and 5 gallon containers, 30 and 55 gallon drums.
Will not Harm:
Computers
Oxygen Sensors
Trap Oxidizers
Particulate Traps
Will not Void:
Manufacturer's warranty
BENEFITS
Increases Mileage
Increases Horsepower
Increases Engine Life
Reduces Downtime
Reduces Pollutants
Reduces Downshifting
Bell's DEE-ZOL is a balanced formulation for all grades and brands of diesel fuel. It consists of a dispersant, moisture eliminator, detergent, combustion improving modifier, lubricant and preservative.
Regular use provides:
Deposit Control
Keeps Injectors Clean
Frees Sticky Valves
Extends Fuel Filter Life
Improves Valve and Ring Seal
Removes Carbon Gum and Varnish Deposit
Moisture Elimination (Without Alcohol) Removes:
Algae, Fungus
Water, Sludge
Cetane Enhancement (without Alcohol) promotes a smoother running engine by:
Improving:
Horsepower
Performance
Cold Weather Starting
Reducing:
Fuel Consumption
Smoke
Emissions
Lubrication-Protects:
Injectors
Valves
Top Cylinder Area
Injector Pump
Rubber "O" Rings
Cylinder Liners
Fuel Stability-Eliminates:
Fuel Stratification
Sludge Formation
Particulate
Seal Conditioner-Prevents shrinkage of:
Fuel Pump Diaphragms
Rubber "O" Rings
Other Rubber Fuel System Parts
Anti-Foam:
Reduces Fill Time
Increases Storage Capacity
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