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compartment. A vent valve in the pipe at the induction manifold end closes automatically when the
engine runs.
AIRCRAFT
Power Plant DA 40 Series
AMM
Page 2
20 Sep 2007 71-70-00 Doc # 6.02.01
Rev. 5
LYCOMING LYCOMING
Fuel Flow
Divider Drain
Fuel Flow
Divider Drain
Fuel Pump
Drain
Inlet Manifold
Drain
Inlet Manifold
Drain
Figure 1: Engine Drains
AIRCRAFT
DA 40 Series
AMM
Power Plant
Doc # 6.02.01
Rev. 5 71-70-00 Page 3
20 Sep 2007
3. Operation
A. Engine Driven Fuel Pump Drain
The fuel pump drain is connected the fuel pump above the diaphragm. If the diaphragm ruptures,
fuel will flow from the fuel pump drain outlet.
B. Fuel Distributor Drain
The fuel injector supplies pressurized fuel to one side of a diaphragm in the fuel distributor.
Atmospheric air pressure acts on the other side of the diaphragm, assisted by a spring under a
compression load. The fuel distributor drain connects to the air side of the diaphragm. If the
diaphragm fails, then fuel will flow from the fuel distributor drain outlet.
C. Induction Manifold Drain
All four induction manifolds connect to a check-valve at the bottom of the manifold. The manifold
drain attaches to the check-valve. When the engine is stationary, the check valve is open and any
residual fuel can drain from the induction manifolds. When the engine operates, the check valve
closes to seal the induction manifold.
AIRCRAFT
Power Plant DA 40 Series
AMM
Page 4
20 Sep 2007 71-70-00 Doc # 6.02.01
Rev. 5
Intentionally left blank
AIRCRAFT
DA 40 Series
AMM
Power Plant
Doc # 6.02.01
Rev. 5 71-70-00 Page 101
20 Sep 2007
Trouble-Shooting
1. General
The table below lists the defects you could have with the engine drains. If you have the trouble detailed
in the Trouble column read across to the Possible Cause column. Then do the repair given in the Repair
column.
Trouble Possible Cause Repair
Fuel flows from the engine
driven fuel pump drain.
Ruptured diaphragm in the fuel
pump.
Replace the engine driven fuel
pump.
Fuel flows from the fuel
distributor drain.
Ruptured diaphragm in the fuel
distributor.
Replace the fuel distributor.
AIRCRAFT
Power Plant DA 40 Series
AMM
Page 102
20 Sep 2007 71-70-00 Doc # 6.02.01
Rev. 5
Intentionally left blank
AIRCRAFT
DA 40 Series
AMM
Power Plant
Doc # 6.02.01
Rev. 5 71-70-00 Page 201
20 Sep 2007
Maintenance Practices
1. General
The maintenance practices in this Section tell you how to remove/install the engine drains.
2. Remove/Install the Engine Driven Fuel Pump Drain
A. Remove the Engine Driven Fuel Pump Drain
Detail Steps/Work Items Key Items/References
WARNING: YOU MUST MAKE SURE THAT THE ENGINE IS SAFE BEFORE YOU
DO WORK ON THE ENGINE DRAINS. MAKE SURE THAT THE
IGNITION SWITCH IS SET TO “OFF”. SET THE THROTTLE TO “IDLE”
AND THE MIXTURE CONTROL TO “LEAN CUT-OFF”.
(1) Remove the cowling from the top of the engine. Refer to Section 71-10.
(2) Release the drain pipe from the engine driven
pump (EDP).
(3) Release the drain pipe from the main engine
drain assembly at the rear of the engine
compartment.
(4) Move the drain clear of the engine.
B. Install the Engine Driven Fuel Pump Drain
Detail Steps/Work Items Key Items/References
(1) Make sure that the drain tube is not damaged
and that it is not blocked.
(2) Move the drain tube into position. Attach the end
of the tube to the engine driven fuel pump with a
hose clip.
(3) Attach the drain tube to the main engine drain
assembly at the rear of the engine compartment
with a hose clip.
(4) Install the top cowling on the engine. Refer to Section 71-10.
AIRCRAFT
Power Plant DA 40 Series
AMM
Page 202
20 Sep 2007 71-70-00 Doc # 6.02.01
Rev. 5
3. Remove/Install the Fuel Flow Divider Drain
A. Remove the Fuel Flow Divider Drain
Detail Steps/Work Items Key Items/References
WARNING: YOU MUST MAKE SURE THAT THE ENGINE IS SAFE BEFORE YOU
DO WORK ON THE ENGINE DRAINS. MAKE SURE THAT THE
IGNITION SWITCH IS SET TO “OFF”. SET THE THROTTLE TO “IDLE”
AND THE MIXTURE CONTROL TO “LEAN CUT-OFF”.
(1) Remove the cowling from the top of the engine. Refer to Section 71-10.
(2) Remove the hose clip that attaches the drain
tube to the connector at the distribution valve and
release the drain tube.
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