Dodge Viper SRT-10 (ZB). Manual — part 275

(3) Cut closeout panel hole for fuel tank and

remove panel (Fig. 9).

(4) Drill holes (11 holes).
(5) Disconnect the LDP electrical connector from

pump (Fig. 10).

(6) Remove the liquid separator from the canister

(Fig. 11).

(7) Disconnect lines from LDP.
(8) Remove the EVAP canister.
(9) Remove the three screws from the pump.

INSTALLATION

(1) Install pump to bracket and tighten screws to

1.2 N·m (10.6 in. lbs.).

(2) Before installing hoses to LDP, make sure

they are not cracked or split. If a hose leaks, it
will cause the Check Engine Lamp to illumi-
nate. Connect lines to the LDP.

(3) Install electrical connector to pump and push

locking tab to lock (Fig. 10).

(4) Install the EVAP canister.
(5) Install the liquid separator to the canister (Fig.

11).

(6) Use the DRBIII

t scan tool, verify proper oper-

ation of LDP.

(7) Install the access panel.
(8) Connect the negative battery cable.

Fig. 9 CUTTING PANEL

Fig. 10 FUEL TANK CONNECTORS

Fig. 11 LIQUID SEPARATOR

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EVAPORATIVE EMISSIONS

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LEAK DETECTION PUMP (Continued)

ORVR

DESCRIPTION

ORVR System Schematic and components (Fig. 12).

OPERATION

The emission control principle used in the ORVR

system is that the fuel flowing into the filler tube
(approx. 1” I.D.) creates an aspiration effect which
draws air into the fill tube. During refueling, the fuel
tank is vented to the vapor canister to capture escap-
ing vapors. With air flowing into the filler tube, there
are no fuel vapors escaping to the atmosphere. Once
the refueling vapors are captured by the canister, the
vehicle’s computer controlled purge system draws
vapor out of the canister for the engine to burn. The
vapors flow is metered by the purge solenoid so that
there is no or minimal impact on driveability or
tailpipe emissions.

As fuel starts to flow through the fill tube, it opens

the normally closed check valve and enters the fuel
tank. Vapor or air is expelled from the tank through
the control valve to the vapor canister. Vapor is
absorbed in the canister until vapor flow in the lines

stops, either following shut-off or by having the fuel
level in the tank rise high enough to close the control
valve. The control valve contains a float that rises to
seal the large diameter vent path to the canister. At
this point in the fueling of the vehicle, the tank pres-
sure increase, the check valve closes (preventing tank
fuel from spiting back at the operator), and fuel then
rises up the filler tube to shut-off the dispensing noz-
zle.

If the engine is shut-off while the On-Board diag-

nostics test is running, low level tank pressure can
be trapped in the fuel tank and fuel can not be added
to the tank until the pressure is relieved. This is due
to the leak detection pump closing the vapor outlet
from the top of the tank and the one-way check valve
not allowing the tank to vent through the fill tube to
atmosphere. Therefore, when fuel is added, it will
back-up in the fill tube and shut off the dispensing
nozzle. The pressure can be eliminated in two ways:
1. Vehicle purge must be activated and for a long
enough period to eliminate the pressure. 2. Removing
the fuel cap and allowing enough time for the system
to vent thru the recirulation tube.

Fig. 12 ORVR System Schematic

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EVAPORATIVE EMISSIONS

25 - 15

VAPOR CANISTER

DESCRIPTION

All vehicles use a sealed, maintenance free, char-

coal filled EVAP canister. The canister mounts to fuel
tank with the LDP attached to it.

OPERATION

All vehicles use a maintenance free, evaporative

(EVAP) canister. Fuel tank vapors vent into the can-
ister. The canister temporarily holds the fuel vapors
until intake manifold vacuum draws them into the
combustion chamber. The Powertrain Control Module
(PCM) purges the canister through the proportional
purge solenoid. The PCM purges the canister at pre-
determined intervals and engine conditions.

Purge Free Cells

Purge-free memory cells are used to identify the

fuel vapor content of the evaporative canister. Since
the evaporative canister is not purged 100% of the
time, the PCM stores information about the evapora-
tive canister’s vapor content in a memory cell.

The purge-free cells are constructed similar to cer-

tain purge-normal cells. The purge-free cells can be
monitored by the DRB III

t Scan Tool. The only dif-

ference between the purge-free cells and normal
adaptive cells is that in purge-free, the purge is com-
pletely turned off. This gives the PCM the ability to
compare purge and purge-free operation.

REMOVAL

NOTE: The trunk panel (Fig. 13) will have to be cut
to remove the EVAP canister.

(1) Disconnect the negative battery cable.
(2) Put access panel in place and scribe the outline

of the panel. Mark the hole for the rivet that hold the
panel in place.

(3) Cut closeout panel hole for fuel tank and

remove panel (Fig. 14).

(4) Drill holes (11 holes).

Fig. 13 TRUNK PANEL

Fig. 14 CUTTING PANEL

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EVAPORATIVE EMISSIONS

ZB

(5) Disconnect the LDP electrical connector from

pump (Fig. 15).

(6) Remove the liquid separator from the canister

(Fig. 16).

(7) Disconnect lines from LDP.
(8) Remove the EVAP canister.
(9) Remove the three screws from the pump.

INSTALLATION

(1) Install pump to bracket and tighten screws to

1.2 N·m (10.6 in. lbs.).

(2) Before installing hoses to LDP, make sure

they are not cracked or split. If a hose leaks, it

will cause the Check Engine Lamp to illumi-
nate. Connect lines to the LDP.

(3) Install electrical connector to pump and push

locking tab to lock (Fig. 10).

(4) Install the EVAP canister.
(5) Install the liquid separator to the canister (Fig.

11).

(6) Connect the negative battery cable.
(7) Use the DRBIII

t scan tool, verify proper oper-

ation of LDP.

(8) Install the access panel.

Fig. 15 FUEL TANK CONNECTORS

Fig. 16 LIQUID SEPARATOR

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EVAPORATIVE EMISSIONS

25 - 17

VAPOR CANISTER (Continued)