DIESEL FUELS & DIESEL FUEL SYSTEMS

Application and Installation GuideDiesel Fuels & Diesel Fuel SystemsInstallation Example with Main and Auxiliary Fuel TanksFigure 3Auxiliary Fuel TanksAuxiliary fuel tanks, service tanksand day tanks are secondary fueltanks located between the main fueltank and the engine. These tanks arerequired in the following situations.• The main fuel tank is locatedon the same level but morethan 15 m (50 ft) away.• The main fuel tank is located3.7 m (12 ft) or more belowthe engine.• The main fuel tank is locatedabove the engine fuelinjectors.Any of the above conditions cancause unsatisfactory engine startingand operation. The purpose of anauxiliary tank is to relieve the fuelpressure “head” from the fueltransfer pump and injectionequipment for efficient fuel flow.A manual fuel priming pump,offered as an attachment, or anelectric motor-driver boost pumpmay allow operation underconditions more severe than thosepreviously described; but wherestarting dependability is required,Caterpillar recommends the use ofan auxiliary fuel tank.Auxiliary tanks offer convenientand ready fuel storage whileproviding a settling reservoir forwater, sediment and sludge. Anexample of an auxiliary fuel tank isshown in Figure 4.©2005 Caterpillar®All rights reserved. Page 13