Operation and maintenance manual

QSB4.5 and QSB6.7 Fuel-Water Separator
Section 3 - Maintenance Procedures at Daily Interval Page 3-3
Fuel-Water Separator
Drain
WARNING
Drain the water-fuel separator into a container and
dispose of in accordance with local environmental
regulations.
Cummins Inc. requires a fuel-water separator or fuel filter
be installed in the fuel supply system.
Drain the water and sediment from the separator daily.
Canister Type
Shut off the engine.
Pull up on the drain valve lever until fluid drains out of the
drain tube. Drain the filter sump until clear fuel is visible.
Push up on the drain valve until fluid drains out of the
drain tube.
Spin-on Type
Shut off the engine.
Use your hand to open the drain valve. Turn the valve
counterclockwise approximately 3½ turns until the valve
drops down 25.4mm [1 in] and draining occurs.
Drain the filter sump until clear fuel is visible.
CAUTION
When closing the drain valve, do not overtighten the
valve. Overtightening can damage the threads.
To close the valve, lift the valve and turn clockwise until it
is hand-tight.