Farymann Diesel 15D Series, Workshop Manual

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III. ENGINE REPAIR
60
The fuel flows from the tank (1) through the filter (2) to the injector pump (3). As the
quality supplied is higher than required for the injection, most of it goes back to the
tank via the return pipe (4), simultaneously carrying heat away from the pump.
Also the return pipe ensures a constant bleed of the fuel system.
From the injection pump fuel is fed through the high pressure pipe (5) to the injector
(6) and, in a fine mist, sprayed into the combustion space shortly before TDC of the
compression stroke. A return pipe (7) carries back any leakage to the tank.