
..
~
FUEL
AND
FUEL SYSTEMS
See the Chassis Operator's Manual in the Owner's
Information Package for fuel recommendations. Since
.
the
generator fuel supply
is
the
same
as
the motor home
engine fuel supply, consult the operating instructions
for
the generator before deciding
on
a fuel type.
Fuel Fill
The
fuel filler cap
is
located on the rear
of
the
coach.
Modem
fuel systems may build up vapor pressure within
the
tank
as
'the
gasoline warms during use or
hot
weather. Under certain conditions, sudden release of this
press~re
when
removing the gasoline cap can spray
gasohne from
the
fill opening, causing a possible hazard.
'WARNING: WHEN REMOVING THE GASOLINE
CAP.
ROTATE
IT
SLOWLY
ONLY
FAR
ENOUGH
TO
ALLOW
PRESSURE
TO
RELEASE.
AFTER ANY
"HISSING"
SOUNDS
STOp,
COMPLETE
THE
REMOVAL'OF THE
CAP.
To
protect
th~
gasoline system from excessive pressure
or!vacuum,
Qr
from sudden release of pressure, replace
.\
lost
caps
with
-caps
of
the same design available from
.'
it
y!?urFleetw,o·od.,motor home dealer.
.
'.;'~:
';'ciean
(jP'.~ueli:~pills
immediately. Raw fuel spilled on
.~.
the
motor
hOme could damage
the
exterior finish and
..
;~;.
is,:~
serious
fire"
hazard. '
C'_·~:.w-
::-i,
/
'-'~;
-~:~
.
wi
fuel
Types
AQd
Vapor Lock
ii';'
'Today's
auton\otive fuel and emissions systems are
sophisticated and highly engineered
to
meet Federal and
state emissions standards. They
are.
also sometimes sen-
sitive
to
fuel types and blends, P;lrticularly blends
that
are optimized
for
climatic conditions.
Fuel
refiners change
the
additives in the fuel to compensate
for
temperature
variations during
winter
or summer months. This com-
pensation changes the "vaporpressure"
of
the fuel. This
mean~
that
the
fuel vaporizes easier during
the
winter
than
it
does during
the
summer
when
higher air
temperatures help
the
fuel vaporize in the engine. Since
colder temperatures reduce the fuel's ability
to
vaporize
and
bum
in.your engine, additives help raise
the
volatili-
ty
oVthe
fueL This helps
the
engine
start
easier and
run.smoother during
winter
months. Under
the
best of··
~nditions,
the
refiners supplytheir gas station customers
with
the
correct fuel for their location and seasonal con-
ditions. Sometimes though, fuel blended
for
winter is
supplied during summer months.
What
this all means is
that
there is a possibility of
"vapor
lock"
during summer driving. This condition is
a combination
of
new
engine' design
(with
attendant
higher temperatures under the hoodl,and excessive fuel
vaporization caused by the vapor pressure
of
the fuel
you
are using. If your engine and fuel system are pro-
perly tuned and maintained, you should
not
experience
vapor lock.
If
vapor lock occurs, the fuel itself could
be the cause. If at all possible, check
with
the
gas sta-
tion attendant
as
to
the fuel blend before filling your
fuel tank. If you purchase your fuel from nationally
recognized fuel dealers, your chances of vapor lock can
be
reduced. If you store your
motor
home during the
winter months, avoid storing large quantities of winter
blended fuel in the tank. When you take the vehicle out
of storage in the spring
or
summer, this fuel may cause
vapor lock until
it
is used
up.
Another note on long storage -if
y.0U
plan
to
store
your motor home
for
a long period in conditions
of
widely
varying humidity, consider topping
off
the fuel tank. This
will reduce the buildup
of
condensation in the tank
that
could cause rough engine operation, fuel filter blockage,
or
other
problems associated
with
water'
in the fuel.
Alternative Fuel Types
Gasohol; a mixture
of
ethanol (grain alcohol)
or
methanol
and
gasoline may
be
used in your motor
h~me
engine
without
voiding the warranty. However,
DO
NOT
UNDER ANY CIRCUMSTANCES USE
FUEL
BLENDS
CONTAINING MORE THAN
5%
METHANOL
OR
10%
ETHANOL, AND DO NOT USE BLENDS THAT
CONTAIN
BOTH METHANOL AND
ETHANOL
Any
fuel blend you .
use containing alcohol
must
also contain cosolvents and k .
other additives
to
protect
the
fuel system·componentS.;; .
If
you are
not
sure
of
the
composition
of
the
alcohol/gasoline blend
you
intend
to
use, ask yoursElr-
vice
station
operator.
Discontinue
use
of
a~y.
alcohol/gasoline blend
if
driveability or'fuElISVStem pto-
Ir;
.
blems occur. .
.'·.h
i)-
Chemical reactions between
the
fuel components and
the materials in
the
fuel lines
can
cause deterioration
of
the
fuel lines during storage periods. These effects
are especially noticeable
with
gasohol blends. If you plan
to
use alcohol blended fuel, and expect
to
store your
motor
home.for periods
of
60
days
or
more, add a fuel
additive
that
is formulated
to
counteract these oxida-
tion effects. Your dealer can advise you on the proper
additives and
their
use.
If
gasohol is spilled on a painted surface, some dull-
ing
or
softening
of
the
paint
may
result.
Overheating
Operate and service
the
engine
and
cooling systems
in your vehicle .as recommended in
the
Chassis
Operator's Manual.
Variable Speed Engine Fan
Your motor
home
engine is equipped
with
a variable
speed fan clutch. When
the
engine is under load
or
re-
quires maximum cooling,
the
fan adjusts and tums faster.
The fan may become very noisy.
at
high speed
and
when
maximum
cooling is required.
When
the
engine doesn't
need maximum cooling,
the
fan
just
idles along. This
conserves fuel and
the
fan is less noisy.
High speed fan noise can sometimes
be
misinterpreted
as
transmission slippage. This is
not
the
case. When