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F U E L T A N K S
INDEX
Page
Fuel Gauge Sending Unit
14
Fuel Reservoir
. . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Fuel System Pressure Release Procedure
10
Fuel Tank Pressure Relief/Rollover Valve
14
Fuel Tank Skid Plate
. . . . . . . . . . . . . .
10
GENERAL INFORMATION
Chrysler Motors b u i l t vehicles pass a f u l l 360° r o l l -
over w i t h o u t fuel leakage. To accomplish t h i s , fuel
and vapor flow controls are required for a l l fuel t a n k
connections.
A l l models are equipped w i t h a rollover
valve
mounted i n t h e t o p o f t h e fuel t a n k . O n vehicles
equipped w i t h a r e t u r n l i n e from t h e fuel pump to
the fuel t a n k a one-way check valve is used to pro-
vide the r e q u i r e d protection. I n a d d i t i o n t o the valve,
improved flow control is used i n t h e fuel pump to
control
flow
w h e n t h e pump is subjected to t h e
higher t h a n n o r m a l pressure w h i c h can occur d u r i n g
rollover. A fuel f i l l e r cap w i t h a higher pressure set-
t i n g is used for the same reason on vehicles w i t h side
fill.
A n evaporation control system is used to reduce
the emissions o f fuel vapors i n t o t h e atmosphere by
evaporation a n d reduce t h e u n b u r n e d hydrocarbons
emitted by t h e vehicle engine. W h e n fuel evaporates
f r o m t h e fuel t a n k , t h e vapors pass t h r o u g h vent
hoses or tubes t o a charcoal canister where they are
t e m p o r a r i l y h e l d u n t i l t h e y can be d r a w n i n t o the i n -
t a k e m a n i f o l d w h e n t h e engine is r u n n i n g .
Inspect a l l hose connections such as clamps a n d
couplings to m a k e sure they are secure and no leaks
are present. Hoses should be replaced immediately i f
there is any evidence o f degradation t h a t could result
i n failure.
A v o i d contact w i t h clamps or other components
t h a t cause abrasions or scuffing. Ensure t h a t t h e
rubber hoses a r e properly routed t o prevent p i n c h i n g
and to avoid heat sources.
The hoses used o n fuel injected vehicles are of a
special construction due to the higher fuel pressures
involved i n t h i s system. I f i t is necessary t o replace
these hoses, o n l y hoses m a r k e d E F M / E F I m a y be
used.
Page
Fuel Tanks
10
Heat Shields
10
General Information
9
No-Lead Fuel Tank Filler Tube
9
Pressure-Vacuum Filler Cap . . . . . . . . . . . . . . . . . . 9
The hose clamps used o n fuel injected vehicles are
of a special r o l l e d edge construction to prevent t h e
edge of the clamp c u t t i n g i n t o the hose. O n l y these
rolled edge type clamps may be used on t h i s system,
a l l other types o f clamps may cut i n t o the hoses and
cause h i g h pressure fuel leaks.
NO-LEAD FUEL TANK FILLER TUBE
A l l catalyst equipped vehicles have a special fuel
t a n k f i l l e r tube. The fuel filler opening is smaller i n
diameter t h a n those used for non-catalyst vehicles t o
p e r m i t e n t r y o f only the smaller no-lead fuel nozzles.
I n addition a deflector, w h i c h is opened by t h e no-
lead fuel nozzle, deters the a d d i t i o n of fuel b y means
other t h a n t h e proper nozzle.
The fuel filler tube on these models is equipped
w i t h a one way b a l l check valve designed to prevent
fuel back splash w h i c h m a y occur w h i l e f i l l i n g t h e
t a n k .
A label is attached to the i n s t r u m e n t panel under
the
fuel
gauge t h a t
reads
" U N L E A D E D
F U E L
O N L Y " as a reminder to the driver. A s i m i l a r label
is located near the fuel t a n k filler.
PRESSURE-VACUUM FILLER CAP
The loss o f any fuel or vapor out of the f i l l e r neck
is prevented b y t h e use of a pressure-vacuum
filler
cap. Relief valves inside the cap w i l l release o n l y u n -
der significant pressure of 6.58 to 8.44 k P a (1.95 to
2.5 psi). T h e vacuum release for a l l gas caps i s be-
tween .97 a n d 2.0 k P a (.14 a n d .29 psi). T h i s cap
m u s t be replaced by a s i m i l a r u n i t i f replacement is
necessary, i n order for t h e system to r e m a i n effec-
t i v e .
CAUTION: Remove filler cap prior to removing or
repairing fuel lines to relieve tank pressure.
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