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The drain fitting at the bottom of the tank normally has a shut-off valve to stop fuel flow during servicing of the fuel system. Sometimes the valve contains a sediment bowl to trap particulates razor and water. This sediment bowl should be checked and emptied often.* Fuel Lines -- Fuel lines are usually metal tubing or flexible hose that connect the tank to the filters, transfer pump, and injection pump. They are normally trouble-free, but problems can occur if the tubing or hoses become bent or kinked. In addition, sometimes the internal layer of rubber in the fuel hoses will collapse and reduce or stop fuel flow. Fuel Overflow or Return Lines -- These lines return diesel fuel either to the fuel tank or to the inlet side of a fuel filter. Some manufacturers pass fuel through the nozzles to absorb heat. When nozzles get too hot, fuel can start burning in the nozzles and deposit carbon on the needle and seat, causing the nozzles to fail.

Results and analysis for a dozen tanks included in the study are shown in the bar chart on page 47."We typically found from 1 quart to 1 gallon of dirt and rust in the bottom of tanks we cleaned," says Country Energy''s Norm Dooley. "And in one case, we found 4 1/2 gallons of contaminants in the tank."Dirt, rust are main problemsA lab analysis of material from selected tanks shows the contaminants are primarily dirt and rust. "We assume the dirt got into the tanks during filling (when the cap was removed) or it could have blown into the tanks through the vent cap. It''s also likely that dust was sucked into the tanks when they naturally breathed as fuel volume or air temperature changed," says Dooley.