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CARBURETOR-HOLLEY
14-5
FUEL PUMP
Condition
Possible Cause
Correction
FUEL PUMP LEAKS-
FUEL
FUEL PUMP LEAKS-
OIL
INSUFFICIENT FUEL
DELIVERY
FUEL PUMP
NOISE
Worn, ruptured or torn diaphragm.
Loose diaphragm mounting plates.
Loose inlet or outlet line fittings.
Cracked or deteriorated pull rod oil seal.
Loose rocker arm pivot pin.
Loose pump mounting bolts.
Defective pump to block gasket.
Vent in tank filler cap restricted.
This
will also
cause collapsed fuel tank.)
Leaks in fuel line or fittings.
Dirt or restriction in fuel tank.
Worn, ruptured, or torn diaphragm.
Frozen gas lines.
Improperly seating valves.
Vapor lock.
Low pressure.
Incorrect fuel pump.
Restricted fuel filter.
Loose mounting bolts.
Scored
or
worn rocker arm.
Weak or broken rocker arm spring.
(a) Install a new fuel pump.
(b)
Install a new fuel pump.
(c) Tighten the line fittings.
(a) Install a new pump.
(b)
Install a new fuel pump.
(c) Tighten the mounting bolts securely.
(d)
Install a new gasket.
(a) Install new cap, and inspect tank for leaks.
(b)
Tighten the line fittings.
(c) Install a new fuel filter and clean out the tank.
(d) Install a new pump.
(e) Thaw the lines and drain the tank.
(f) Install a new fuel pump.
(9) Install heat shield where lines
or
pump are
near exhaust.
(h)
Install a new fuel pump.
(i) Install correct fuel pump.
(i)
Install a new filter.
(a) Tighten the mounting bolts.
(b)
Install a new fuel pump.
(c) Install a new spring.
PART 2
HOLLEY 1920 R SERIES
CARBURETORS
Description
The Holley carburetors models R-3053A R-3054A
R-3055A and R-3056A used on the 170 cubic inch en-
gine, are equipped with a spring staged choke, as
shown in (Fig.
1).
Since all the Holley carburetors are
serviced in the same manner, the spring staged choke
adjustment will be covered separately and indicated
as such in the service procedures.
The Holley carburetors used on the 225 cubic inch
engine, models R-3057A R-3059A R-3060A and (high
performance) R-3058A with manual and automatic
transmissions are serviced the same as the previously
mentioned carburetors. Refer to (Fig. 2). Since the
service procedures are identical on all Holley carbu-
retors, the illustrations showing the various disassem-
bly procedures will not always show any one specific
carburetor.
The spring staged choke, shown in (Fig. 1) is a de-
vice incorporated in the choke mechanism which lim-
its the choke blade closing torque when cranking the
engine at temperatures below zero. Thus the spring
staging of the choke is a better match for the engine's
starting mixture requirements at both the low and
SPRING STAGED
CHOKE
CHOKE
FAST IDLE
LEVER
VALVE
CAM LINK
SCREW
SCREW (CURB IDLE)
Fig.
I-Carburetor
Assembly
lR-3053, and R-3054
Typical of R-3055 and R-3056)
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