PS Magazine - TB 43-PS-581

PS, The Preventative Maintenance Monthly

ISSUE 581

APRIL 2001
PS Magazine - TB 43-PS-581 - Page 9 of 32
PS 581
15
PS 581
APR 01
14
Old fuel
cap doesn’t
always vent
Think Before You Restart
D
rivers, if your tank aborts right after
start-up, think before you try an immedi-
ate restart.
Maybe you’ll remember to eyeball the
OIL PRESS LOW caution light on the
master panel. If it’s on, you’ve just
found the reason for the abort. The
tank’s electronic control unit shut down
the vehicle because of low oil pressure
in the engine.
Trying to restart the vehicle will just
result in another abort—and can cause
heat damage to the combustor can and
nozzles in the engine’s rear module.
Call in your mechanic. He’ll trou-
bleshoot the problem to find out why
your tank has low oil pressure.
Do not restart when OIL
PRESS LOW light is on
M1-Series Tanks…
front fuel cell that could collapse it.
Then, your tank has to go to depot for a
new fuel cell.
A new, more reliable green cartridge
filter is available as part of the semian-
nual service kit, NSN 2540-01-255-
3347. That means your old fuel caps
will be automatically converted during
your tank’s next service.
In the meantime, to be safe, loosen
the front two fuel caps before you begin
transferring fuel. That lets air in and
keeps the pressure balanced so the fuel
cells won’t collapse.
You can also order new fuel caps,
NSN 5342-01-467-5645, that already
have the green cartridge filter installed.
Just make sure you change out the caps
in pairs: both front caps or both rear
caps. Otherwise, the difference in pres-
sure during fuel transfer can collapse a
fuel cell.
Make a note of the new fuel cap NSN
until it is added to the parts TMs.
T
ankers, if your vehicle has fuel caps,
NSN 5340-01-387-4007, you could
have some problems transferring fuel.
Those fuel caps have a small, black
cartridge filter on top. The check valve
on the cartridge filter is supposed to
pop open whenever there’s a pressure
imbalance between air inside and out-
side the fuel cells—like every time you
transfer fuel.
Unfortunately,
the check valve
doesn’t always work. If it doesn’t pop
up, you get pressure buildup in the
581. 14-15 (C)
3/3/01
12:50 PM
Page 1
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