L-1011 Engine: Engine Fuel System

Low Pressure Pump

Receives fuel from aircraft system and ensures satisfactory pressure to the high pressure pump. Has a scroll type impeller working on an induction and centrifugal principle.

L.P. Fuel cooled Oil Cooler 

Engine oil system uses low pressure fuel as an oil cooling medium Conversely maintains fuel temperature above 0ºC for fuel heating.

High Pressure Pump

Delivers the required fuel flow to the combustion chamber as scheduled by the fuel regulator. A gear type pump.

Fuel Regulator 

Controls the high pressure pump output according to signals received from the pressure ratio control and HP shaft speed. A mechanical unit driven but he external gearbox.

Pressure Ratio Control 

Tells the fuel regulator the fuel flow required to achieve the P4/P1 pressure ratio selected by the pilot's throttle lever. It is part of the fuel regulator.

Control Signal Amplifier

This unit signals the high pressure fuel pump when N1 & N2 or TGT reach predetermined maximums. The HP fuel pump then controls fuel flow to prevent here maximums from being exceeded.

Starting Fuel Regulator 

Ensures a suitable fuel flow for light up and acceleration under all conditions.

Manual Enrichment Solenoid 

Provides extra fuel during the start cycle. Selected by the pilot through the Start/Fuel/Ignition switch.

H.P. Shutoff Valve 

Controls the fuel flow to the fuel spray nozzles when starting and stopping the engine. Electrically actuated valve.

Fuel Flowmeter

Provides signal of engine fuel flow and fuel used to the flight deck instruments.