737 MAX Flight Crew Operations Manual
Fuel -
Controls and Indicators
MN-FLT-OH-201
12.10.9
1
Fuel Measuring Stick
Allows comparison of fuel quantity or weight as determined from measuring stick
reading and fuel weight indicated by fuel quantity indicators:
• six fuel measuring sticks are installed in each main tank and four are
installed in center tank
• reading is obtained by withdrawing measuring stick from tank and
latching it magnetically to an internal float. Fuel depth is read where
stick passes through wing skin.
2
Manual Defueling Valve
Open – interconnects engine feed system and fueling station for:
• defueling
• ground transfer of fuel.
Closed – isolates engine feed system from fueling station.
3
Fueling Receptacle
Hose connection receptacle for single point fueling.
4
Solenoid Override
Mechanically opens solenoid operated valve. Fuel valve opens if fuel pressure is
available.
5
Fueling Valves
With the battery switch ON, and the refueling door open, fuel pressure opens
valve.
6
Refueling Power Control Relay
Door closed – proximity sensor deactivates power to fueling system.
Door open – the fueling system is powered and panel lights illuminate.
7
Test Gauges & Fueling Panel
March 1, 2021