Operation
8019−1/A1
Winterthur Gas & Diesel Ltd.
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Fuel System
1. General 1..........................................................
2. Low Pressure Circuit 1..............................................
2.1 Adjustable Pressure Retaining Valve − Setting 1................
3. High Pressure Circuit 1.............................................
4. Fuel Leakage System 4.............................................
4.1 Leakage Inspection Points 4...................................
4.2 HP Fuel Pipes − Leakage 4....................................
4.3 HP Fuel Pipes to Injection Valves − Leakage 6..................
4.4 Leakage Check of Pressure Control Valve 8.....................
1. General
For heavy fuel oil operation, all pipes to the fuel rail have adjacent insulated heating
pipes to heat the fuel (see Fig. 1). These heating pipes also keep the fuel warm
during short periods when the engine has stopped.
For safety, the fuel rail is installed in the rail unit (28). All pipes in the high pressure
circuit that are out of the rail unit have double walls.
2. Low Pressure Circuit
A booster pump (installed in the plant) supplies the fuel through the fuel inlet pipe (1)
to the fuel pumps (3). The fuel quantity that the fuel pumps supply is more than
necessary for the engine. The adjustable pressure retaining valve (12) controls the
pressure difference upstream and downstream of the supply pumps. The unwanted
fuel flows back to the system through the fuel outlet pipe (5).
2.1 Adjustable Pressure Retaining Valve − Setting
For the values of the adjustable pressure retaining valve, see the indications given in
0250−1, Operating Data Sheet, Fuel Inlet (fuel pump) and Return (fuel pump return).
3. High Pressure Circuit
The fuel pumps (3) supply high pressure fuel through the high pressure (HP) fuel
pipes (8) into the fuel rail (10). The fuel pumps supply fuel as necessary to keep the
pressure in the fuel rail constant (see 5556−1 Fuel Pump).
If an HP fuel pipe (8) has a leak or is broken, the non-return valves (9) close to
prevent a pressure decrease.
The pressure control valve (15) controls the fuel pressure. The pressure control valve
also lets fuel flow through the fuel pumps, HP fuel pipes and fuel rail during engine
stand-by. This keeps the fuel warm (see also 5562−1 Pressure control valve).
2014
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