Water pump engine and vehicle engine share same fuel source. If fuel is contaminated or
incorrect type, it will be necessary to drain fuel tank, lines, and replace all fuel filters for
both water pump engine and vehicle engine.
Start vehicle engine (TM 9-2320-347-10). Check if vehicle engine misfires, runs rough,
or lacks power.
If vehicle engine misfires, runs rough, or lacks power, drain vehicle fuel
tank (TM 9-2320-347-10).
Water pump engine is disabled once water pump engine EMR inline fuse is removed.
Open pump operator's panel housing (WP 0325). Remove water pump engine EMR
inline fuse (WP 0394). Disconnect water pump engine fuel return line from fuel tank
and place fuel line in a suitable container. Turn battery disconnect switch to ON
position (WP 0007). While an assistant puts pump operator's panel START PUMP
ENGINE START switch to START position (WP 0004), check if fuel flow is weak or
aerated. Connect water pump engine return fuel line on fuel tank (WP 0234).
If fuel flow is not weak or aerated, go to Step 7.
Open passenger side crew cab water pump engine compartment door (WP 0010).
Remove pump house panel O (WP 0540). Remove passenger side crew cab access
panel (WP 0499). Inspect supply fuel lines for loose fittings, kinks, and damage
If fuel lines have loose fittings, are kinked or damaged, tighten loose fittings
or replace kinked or damage fuel lines (WP 0234) and install water pump
engine EMR inline fuse (WP 0394).