DIESEL ENGINE FUEL SYSTEMS A. DIESEL FUELS| 5A1. General.
Normally, diesel fuel oils for use in the Submarine Service are
purchased by the Bureau of Supplies and Accounts. At the time of
delivery, the diesel fuel oils are inspected to make sure that
they meet the specifications set up by the Bureau of Ships.
However, emergencies occasionally arise both in the supply and
in the handling of diesel fuels that make it imperative for
operating engineering personnel to have at least a fundamental
knowledge of the requirements for diesel fuel oil. 5A2.
Cleanliness. One of the most important properties necessary in a
diesel fuel oil is cleanliness. Impurities are the prime sources
of fuel pump and injection system trouble. Foreign substances
such as sediment and water cause wear, gumming, corrosion, and
rust in the fuel system. Diesel fuel oil should be delivered
clean from the refinery. However, the transfer and handling of
the oil increase the chance of its picking up impurities. The
necessity for periodic inspecti