Chapter 3
OPERATION
3-3
Priming pump cap tightening method
1 Turn the priming pump cap by hand until the
force required to turn the cap increases sud-
denly.
2 With the cap at the position described above,
place a mark on the cap.
3 Then, use a wrench or another appropriate tool
to tighten the priming pump cap 90
±
10
°
.
4 Check the cap to make sure that the head pack-
ing is not protruding.
Note: If the head packing is protruding, loosen the
priming pump cap, check the packing to
make sure it is not damaged, then retighten
the priming pump cap.
If the head packing is damaged, the priming
pump or feed pump must be replaced. Con-
tact a Mitsubishi dealer.
If the priming pump cap is not tightened firmly,
internal threads can wear quickly due to friction
caused by engine vibrations, resulting in sudden
ejection of the priming pump cap to cause a fuel
spill.
On the other hand, if the priming pump cap is tight-
ened with excessive force (turned 120
°
or more),
the head of the priming pump can become dam-
aged.
To prevent such problems, be sure to turn the cap
the specified angle (90
±
10
°
).
fig.3-4 Priming pump cap tightening method
θ
fig.3-5 Priming pump cap packing
Head packing