2.5 psi or if a negative pressure of 1.0 psi develops in the surge tank. Once opened, the pressure relief valve stays open until it is manually reset. This assures continued venting of each surge tank if a vent flame arrestor becomes plugged. When you pull the reset handle down it resets the pressure relief valve. You can manually open the pressure relief valve if you put a stiff rod, 2.0 inches minimum long by 0.18 inches diameter maximum, into the center ambient sense port and push up. This releases the locking mechanism and permits the poppet to spring open.
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A

757
MAINTENANCE MANUAL

FLOAT DRAIN VALVE  VENT FLAME ARRESTOR 
SEE  A  SEE  D 
PRESSURE 
RELIEF VALVE 
SEE  B 

DRAIN CHECK VALVE SEE C
DRAIN CHECK VALVE
SEE C PRESSURE RELIEF VALVE SEE B
VENT FLAME ARRESTOR SEE D
VENT STRINGER DOOR
FLOAT 
PRESSURE RELIEF  DRAIN 
VALVE  VALVE 
FLOAT 
O-RING 
FLOAT DRAIN VALVE
ACCESS DOOR  A 

WING SKIN (LOWER SURFACE)
GASKET
(KNITTED ALUMINUM)

BOLT CLAMP RING
MOUNTING BOLT
PRESSURE RELIEF VALVE
B
Fuel Vent System Components Figure 3 (Sheet 1)
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757
MAINTENANCE MANUAL

TANK END RIB
DRAIN CHECK VALVE
LOWER WING SKIN 
FWD  RUBBER SEAL  NUTPLATE 
INBD 
C DRAIN CHECK VALVE  O-RING  A 
ARRESTOR FLAME THE VENT HOUSING OF 
A  DOOR ACCESS 
MOUNTING BOLT 
TUBE  VENT FLAME ARRESTOR 
VENT FLAME ARRESTOR  D 
FLAME ARRESTOR HOUSING OF THE VENT 

SURGE TANK ACCESS DOOR (VENT SCOOP)
A-A
Fuel Vent System Components Figure 3 (Sheet 2)
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