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components:
− Maintenance shut-off valve.
− Gascolator.
− Electrical fuel pump.
− Maintenance drain tap in the supply pipe.
− Fuel shut-off valve.
Fuel returns from the engine to the fuel tank through these components:
− Fuel return pipe.
− Maintenance drain tap in the return pipe.
− Check valve.
With the fuel shut-off valve set to CLOSED, fuel cannot flow to the engine.
CAUTION: LOCK THE MAINTENANCE SHUT-OFF VALVE OPEN WITH WIRE. IF
YOU DO NOT LOCK THE VALVE OPEN IT MAY CLOSE IN FLIGHT.
THIS WOULD CAUSE ENGINE FAILURE.
You can close the maintenance shut-off valve to do maintenance on the fuel system components
below the fuel tank.
Fuel
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CHAPTER 28-10
FUEL STORAGE
1. General
This Chapter gives you more data about the fuel tank installation.
2. Description
Figure 1 shows the fuel tank. The standard capacity aluminum tank can hold 93 liter (24.5 US gal)
total fuel of which 91 liter (24 US gal) is usable fuel. An optional tank with a capacity of 78 liter
(20.5 US gal) total fuel of which 76 liter (20 US gal) is usable fuel may be installed in place of the
standard capacity fuel tank.
Baffles inside the tank prevent too much fuel movement. An aluminum tube at the left of the tank
connects to the fuel filler. A vent pipe connects to the aluminum tube. The vent pipe goes down
through the fuselage skin to the outside of the airplane. The fuel tank electrically bonds to the fuel
ground connection
The tank is located between the spar bridge and the B bulkhead. Pads on the spar bridge and B
bulkhead locate the tank. A steel band holds the tank in position. The baggage compartment floor
panel covers the fuel tank.
The top of the tank has a mounting for the fuel quantity sensor. The bottom of the tank also has
connections for:
− The fuel supply to the maintenance shut-off valve. The tank has 2 supply pipes. These
connections have a hollow bolt with a finger filter. The bottom part of the hollow bolt makes a
small stand-pipe. This makes a sump to prevent water (or other contaminants) from entering
the fuel system.
− The fuel drain valve. The fuel drain valve connects to the lowest part of the tank. You can
use the fuel-sampler cup to operate the drain valve. Push the extension tube upwards to
operate the drain valve. Release it to close the valve. You can drain the tank fully using the
drain valve.
− The fuel return pipe.
Fuel
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Figure 1: Fuel Tank Installation
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TROUBLE-SHOOTING
1. General
Use the data below to trouble-shoot the fuel storage system.
Complaint Possible Cause Remedy
Smell of fuel in the airplane. Fuel hose connection loose.
Fuel tank cracked.
Fuel filler hose loose.
Tighten the connection.
Replace or repair the fuel
tank.
Tighten the connection.
Fuel tank filler-cap leaking. Defective filler-cap seal Replace the seal.
Fuel tank connection leaking. Defective drain valve seal.
Damaged thread.
Replace the seal.
Repair or replace the fuel
tank.
Fuel contamination. Bulk fuel supply contaminated. Remove and flush the fuel
tank. Flush all fuel pipes.
Clean or replace all filters.
Note: Most fuel contamination comes from poor quality control of the fuel before
putting it in the airplane. Make sure you use only clean fuel that meets the
specification for AVGAS 100 LL.
Fuel
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MAINTENANCE PRACTICES
1. General
These maintenance practices tell you how to remove and install components. They also tell you
how to flush the fuel system. See Chapter 28-00 for the system description. See Chapter 28-40 for
the fuel gauge installation.
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.
2. Remove/Install the Fuel Tank
A. Remove the Fuel Tank
Detail Steps/Work Items Key Items
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钻石20系列AMM 1(113)
