6—FUEL
AND
EXHAUST SYSTEM
CHRYSLER SERVICE MANUAL
distribution to the engine. Any fuel vapor
(caused by excessive heat) that has gathered
in the indrawn fuel, rises to the top of the
separator unit and is forced out of the metered
fitting into the return line, back to the fuel tank
for condensation to solid fuel.
b.
Servicing the Vapor Separator
As previously mentioned, the vapor separator
unit is serviced only as an assembly. Checking
to see if the unit is installed correctly (with
the return line fitting uppermost) and that the
metered orific in the return fitting is open, is
the extent of service.
To check the vapor separator unit for a re-
stricted or plugged screen, disconnect the fuel
inlet and return lines at the unit. Remove unit
from carburetor. Reconnect fuel inlet line and
plug return.
With a suitable container under the outlet
connection, turn engine over with starting mo-
tor. Check the quantity of fuel pumped through
the unit. See volume in Paragraph 1. If the
flow appears to be restricted, install a new
vapor separator unit.
If vapor lock is evident, remove the coupling
hose at the unit and check to see if orifice is
open. If clogged, bend a paper clip and insert
through opening to clear. If necessary, use air
pressure to clear return line, after removing
tank filler cap.
SERVICE DIAGNOSIS
10.
FUEL PUMP LEAKS—FUEL
a. Tighten loose housing screws.
b.
Install new diaphragm.
c. Tighten loose inlet or outlet or outlet fuel
fittings.
11.
FUEL PUMP LEAKS—OIL
a. Install new diaphragm.
b.
Tighten fuel pump mounting bolts.
c. Install new pump to block gasket.
d. Install new pull rod oil seal.
12.
INSUFFICIENT FUEL DELIVERY
a. Tighten fuel line fittings.
b.
Install new diaphragm.
c. Thaw out frozen fuel lines.
d. Install new valve body.
e. Install correct fuel pump.
13.
FUEL PUMP NOISE
a. Tighten fuel pump mounting bolts.
b.
Install new rocker arm.
c. Install new rocker arm follower spring.
d. Lubricate at rocker arm pivot and pull
rod with Lubriplate.
CARBURETOR
MODEL BBD-2685S (MODEL
LC-1)
The Ball and Ball (BBD) (Fig. 5) series car-
buretor is of the dual downdraft type. Each
throat has its own throttle valve, idle and main
metering systems and are supplemented by
the float, accelerating and power systems.
14.
CARBURETOR MODEL IDENTIFICATION
On each BBD series carburetor, model number
is stamped on metal tag attached to air horn.
Do not remove or destroy this tag, as it is the
only means provided for carburetor model
identification. Before attempting to repair or
overheal carburetor, refer to model number
and secure a repair kit for number indicated
on tag.
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