Technical data

13773-001
73-00
Page 1
ENGINE FUEL SYSTEM
1. GENERAL
This chapter describes those units and components which deliver metered fuel and air to the engine. Com-
ponents covered include the manifold pressure gage/fuel flow gage. For additional information on fuel
injection system components, refer to the Teledyne Continental Motors Model IO-550 Fuel Injection Sys-
tems Overhaul and Parts Catalog indexed in the List of Publications in the front of this manual. (List of Pub-
lications)
The fuel injection system is of the multi-nozzle, continuous-flow type which controls fuel flow to match
engine air flow. Any change in throttle position, engine speed, or a combination of these, causes fuel flow
to change in the correct relation to engine air flow. (See Figure 73-001)
Fuel is drawn from the supply tanks by the engine-driven fuel pump, where the fuel is metered based on
engine and environmental conditions. Excess fuel is returned to the tank. A boost pump is installed for use
in starting and vapor suppression. When liquid fuel leaves the fuel-pump pressure chamber, it is directed to
an integral mixture control valve. The mixture control valve shaft is linked to the cockpit mixture control.
From the mixture control valve, fuel is directed to the fuel metering valve mounted on the side of the throt-
tle body. The shaft that positions the throttle body butterfly valve also positions the metering valve and is
linked to the cockpit throttle control. From the fuel metering valve, fuel passes through the fuel flow meter,
then to the fuel manifold valve.
The fuel manifold valve contains a diaphragm chamber and the necessary ports which connect to the fuel
injector lines. When fuel pressure reaches approximately 3.5 psi, the manifold valve admits fuel to the six
ports in the manifold. The spring-loaded diaphragm works with a ported plunger which distributes the pre-
cise amount of fuel, via the fuel injector lines, to the fuel injector nozzles.
30 Nov 2000