2. Remove/Install the Fuel Selector/Shut-Off Valve
A. Remove the Fuel Selector/Shut-Off Valve
Remove the fuel selector valve and gascolator as an assembly. Obey the safety precautions for fuel at all times.
Detail Steps/Work Items  Key Items/References 
(1)  Defuel the airplane.  Refer to Section 12-10. 
(2)  Drain the fuel from the distribution system.  Use a suitable container. Drain the fuel from the gascolator drain valve. 
(3)  Remove the access panel from the bottom of the fuselage around the gascolator drain valve.  Refer to Section 52-40. 
(4)  Disconnect the flexible hose which connects the left fuel tank to the selector valve, at the selector valve.  Put caps on the connections. 
(5)  Disconnect the flexible hose which connects the right fuel tank to the selector valve, at the selector valve.  Put caps on the connections. 
(7)  Disconnect the fuel pipe which connects the gascolator to the electric fuel pump at the gascolator.  Put caps on the connections. 

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AMM

DA 40 Series

Detail Steps/Work Items  Key Items/References 
(8)  Disconnect the connecting shaft from the selector valve: S Remove the left pilots seat. S Remove the 3 nuts and bolts which attach the operating head to the selector valve. S Move the connecting shaft and operating head clear of the selector valve.  Refer to Section 25-10. Refer to Figure 1. 
(9)  Remove the selector valve: S Remove the nut and washer which attach the gascolator mounting plate. S Remove the four bolts and washers which attach the selector valve to the mounting plate. S Lower the selector valve and fuel gascolator clear of the airplane.  Hold the selector valve! 

B. Install the Fuel Selector/Shut-Off Valve
Detail Steps/Work Items  Key Items/References 
(1)  Move the selector valve and fuel gascolator into position at the mounting plate.  Make sure that the gascolator mounting bracket is correctly located. 
(2)  Install the fuel selector valve and fuel gascolator: S Install the 4 washers on the 4 bolts. S Put the bolts and washers into position through the selector valve into the anchor-nuts. S Install the nut and washer which attach the gascolator mounting bracket. S Tighten all the bolts hand tight. S Tighten the bolts. 

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Fuel System
AMM

DA 40 Series

Detail Steps/Work Items  Key Items/References 
(3)  Connect the selector valve operating lever: S Move the connecting shaft and operating head into position on the selector valve. S Install the 3 bolts, washers and nuts which attach the operating head to the valve. S Tighten the 3 bolts.  Make sure that both the selector valve lever in the cockpit and the selector valve are set to OFF. 
(4)  Connect the pipe from the gascolator valve to the selector valve. 
(5)  Connect the flexible hose from the right fuel tank to the selector valve. 
(6)  Connect the flexible hose from the left fuel tank to the selector valve. 
(7)  Set the selector valve control lever to OFF. 
(8)  Refuel the airplane.  Refer to Section 12-10. 
(9)  Do a test for fuel leaks from the connections which you have made: S Set the airplane ALT/BATT switch to ON. S Set the electric fuel pump to ON. S Set the fuel selector valve to BOTH. S Examine the fuel selector valve and attaching equipment for fuel leaks. S Set the selector valve to OFF. S Set the electric fuel pump to OFF. S Set the airplane ALT/BATT switch to OFF. 
　
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