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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. 

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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. 

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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. 
(3)  Move the drain tube to the rear, through the rubber grommet in the engine baffles, and clear of the engine. 
(4)  Remove the hose clip that attaches the drain tube to the main engine drain assembly at the rear of the engine compartment. 

B. Install the Fuel Flow Divider 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 through the rubber grommet in the engine baffle. 
(3)  Attach the end of the drain tube to the fuel flow divider with a hose clip. 
(4)  Attach the other end of the drain tube to the main engine drain assembly at the rear of the engine compartment with a hose clip. 
　
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