Engine Start and Operation 267
Fuel Tank Cap(s)
Do not remove the fuel tank cap near an
open flame. Diesel fuel vapors are com-
bustible and can cause an explosion or
fire, resulting in severe personal injury
or death.
Some fuel tank caps have a pressure and a
thermal relief function built into the cap.
These functions are designed to avoid fuel
spills in the event of an accident. The pres-
sure relief function of the safety venting
system has a crack pressure high enough to
retain fuel in the tank regardless of the ori-
entation of the vehicle (5 to 8 psi).
The thermal relief feature is large enough
to limit tank pressure to a safe level even
when the remaining fuel is boiling in the
tank, but not so large as to dump fuel un-
necessarily. The thermal relief should
respond as much as possible to fuel tem-
perature rather than flame temperature.
These features are also available on the op-
tional lockable fuel tank cap.
WARNING
Only replace the cap with a cap contain-
ing the same features described above.
Unnecessary fuel spills leading to in-
creased fire hazard may be the result of
using a cap without the pressure and
thermal relief mechanisms.
In the case the cap is lost, it must be re-
placed with a cap containing the same
features.
W2003143
W2003144
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