(7)
Close all the removal valves for the boost pumps manually.
(8)
Make sure the APU fuel shutoff valve is closed (AMM 28-22-31/501).
S 012-028
(9)
Get access to the bypass valves for the boost pumps (Fig. 202).
(a)
Remove the No. 1 access panels for each of the two wing fuel tanks (AMM 28-11-11/401).
(b)
Find the applicable rib access openings (AMM 28-11-11/401).
S 862-025
S 862-060
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737-300/400/500MAINTENANCE MANUAL
S 492-065
(10) Do these steps to install the plugs for the bypass valve inlets (Fig 202):
(a) Loosen the bolts that attach the bypass valve to the engine fuel-feed tubing.
NOTE: Loosen the bolts sufficiently to permit you to put
____ the plug into the flange without moving the O-ring from its groove in the check valve.
(b)
Remove one bolt from the flange.
(c)
Apply a thin layer of petroleum jelly to the plug.
CAUTION:_______PUT THE PLUG INTO THE FLANGE CAREFULLY. DAMAGE TO THE O-RING IN THE FLANGE CAN OCCUR.
(d)
Put the bolt that you removed in the flange again.
(e)
Tighten the bolts on the flange to make sure the plug has a good seal (AMM 20-50-11/201).
S 862-031
(11)
Make sure the refueling valves and the defueling valve are closed.
S 862-032
(12)
Make sure the shutoff valves and crossfeed valve are open.
S 012-071
(13)
Open the left fan cowl panels, 5746 and 5846, on each engine (AMM 71-11-02/201).
S 682-073
(14)
Drain the fuel supply line for each engine.
(a)
Put a container approved for fuel below the fuel filter drain plug.
(b)
Remove the fuel filter drain plug and let the fuel drain.
(c)
Remove and discard the O-ring from the drain plug.
(d)
Install a new O-ring, lightly lubricated with petrolatum, on the drain plug.
(e)
Install the drain plug, with the threads lightly lubricated with grease. 1) Tighten the drain plug to 45-55 pound-inches (5.1-6.2
Newton meters).
2) Install a lockwire on the drain plug.
S 032-074
(15) Disconnect the fuel supply line for each engine at the left service disconnect panel.
(a) Install a cap on the fuel connector on the panel to give protection from contamination.
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737-300/400/500MAINTENANCE MANUAL
F. Vacuum Test Procedure
S 862-061
(1)
Make sure the vacuum pump is correctly grounded to the same ground as the airplane.
S 492-066
(2)
Connect the air pressure source (100 psi) to the vacuum pump (Fig. 201).
S 482-036
(3)
Connect the vacuum pump (Fig. 201) to one of the disconnected hoses for the engine fuel feed.
S 482-037
(4)
Install the pressure gage (0-30 inches of mercury) in the other disconnected hose for the engine fuel-feed.
S 792-038
(5)
Apply the vacuum to the fuel-feed lines.
(a)
With the pump shutoff valve open, start the vacuum pump (Fig. 201).
(b)
Apply a vacuum of between 17 and 18 inches of mercury.
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