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connection.
− Set the fuel pump switch to OFF.
− Set the GEN/BAT switch to OFF
(10) Bleed the engine fuel system. Refer to Chapter 73-00.
(11) Install the engine cowlings. Refer to Chapter 71-10.
4. Overhaul The Fuel Cap
This procedure tells you how to overhaul the fuel cap that closes the fuel filler neck
Obey the usual safety precautions when you do work on the fuel system
WARNING: DO NOT ALLOW HEAT OR FIRE NEAR FUEL. FUEL BURNS
VIOLENTLY. THIS CAN CAUSE INJURY TO PERSONS AND
DAMAGE TO EQUIPMENT
WARNING: DO NOT GET FUEL ON YOUR SKIN. FUEL CAN CAUSE SKIN
DISEASE.
Fuel
DA20-C1 AMM
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29 Apr 2004 28-10-00 Doc # DA201-C1
Rev. 9
Detail Steps/Work Items Key Items
(1) Remove fuel cap Use key
(2) Remove nut and disassemble cap Put key in lock before removing lock
(3) Inspect O-rings to condition and replace as
required
- Main O-ring 45 x 3.5 mm
- Centre O-ring 5 x 1.5 mm
Viton or Mc-Nitule
(4) Lubricate lock lever and centre pins with
silicone grease or petroleum jelly
Do not use excessive lubricant
(5) Re-assemble cap
(6) Adjust nut as required so cap engages tight
in mounting flange and lever force is not
excessive
(7) Install fuel cap
DA20-C1 AMM
Fuel
Doc # DA201-C1
Rev. 9 28-20-00 Page 1
29 Apr 2004
CHAPTER 28-20
FUEL DISTRIBUTION
1. General
This Chapter gives you more data about the fuel distribution system. See the Continental engine
manuals for data about the engine fuel system.
2. Description
Figure 1 shows the location of the fuel distribution system components in the airplane.
The fuel distribution system has these components:
A. Maintenance shut-off valve
The maintenance shut-off valve is located below the fuel tank. It attaches to the inlet port of the
gascolator. The valve has 2 positions:
− Open. The valve connects the fuel tank to the gascolator inlet. You must lock the valve in
this position with wire at all times when you operate the airplane.
− Closed. The valve stops fuel flow to the gascolator inlet. Use this position only to do
maintenance on the fuel system. For example, when you clean the fuel filter.
B. Gascolator
The gascolator is located below the fuel tank on the left. It attaches to the B-bulkhead. The
gascolator is a sediment trap. It also has a filter screen. You can release the bowl of the
gascolator to clean the filter.
Fuel
DA20-C1 AMM
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29 Apr 2004 28-20-00 Doc # DA201-C1
Rev. 9
Shut-Off Valve Lever
Shut-Off Valve
Return
Connection
Supply
Connection
Gascolator
Maintenance
Shut-Off Valve
Electrical Fuel Pump
Maintenance Drain Taps
Check Valve
Fuel Supply Hoses
Type I System Removed
Figure 1: Fuel Distribution System
DA20-C1 AMM
Fuel
Doc # DA201-C1
Rev. 9 28-20-00 Page 3
29 Apr 2004
C. Electrical Fuel Pump
The electrical fuel pump is located below the fuel tank. It attaches to the forward face of the Bbulkhead
at the bottom on the right. A FUEL PUMP switch is located on the left instrument
panel with a FUEL PUMP PRIME switch located on the top left corner of the panel, top right on
reversed panel. The FUEL PUMP circuit-breaker is located on the right instrument panel.
D. Maintenance Drain Taps
The maintenance drain taps are located on the fuselage inner skin below the spar bridge. They
are at the lowest point in the fuel system. You can use the drain taps to drain water from the fuel
pipes in the system. Use the drain valve in the fuel tank for the usual water drain check.
E. Fuel Shut-Off Valve
Figure 2 shows the Fuel shut-off valve. The fuel shut-off valve is located on the aft face of the
firewall. It has a red-striped handle. The fuel shut-off valve can also be located on the center
console. The valve has 2 positions:
− OPEN. The valve connects the electrical fuel pump outlet to the engine fuel system. This
is the usual position when you operate the airplane.
− CLOSED. The valve stops all fuel flow to the engine.
F. Check Valve
The check valve is located beside the fuel tank on the left. It is in the fuel return pipe. The
check valve prevents fuel vapor from the return pipe being sucked into the engine during engine
start. You cannot adjust the check valve.
G. Fuel Hoses.
Flexible fuel hoses made of ‘Teflon’ connect the components. The hoses have a protective
metal sheath. The hoses have standard flared end-fittings.
You must bleed the engine fuel system after any work which allows air into the airplane fuel supply
　
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