Service manual

6
NOTE: With the engine turned off, have an assistant slowly press the accelerator pedal to the floor, while you watch the
throttle for any sticking or binding. Correct any sticking or binding conditions before proceeding. Also ensure that you
are reaching full throttle. Many performance problems are traced to partial throttle openings from improperly adjusted
linkage.
Figure 6
6. Reconnect the appropriate vacuum hoses to the carburetor, noting the correct fitting from Figure 6 and 8.
A. The full manifold vacuum source in the front of the throttle body provides vacuum for proper operation of the air
cleaner, the pump diverter valve (if equipped), AC/Cruise, and/or the temperature sensing valve. If vacuum for more
than one component is needed, use small plastic vacuum “T”s (available at most automotive stores).
B. The timed spark fitting in the choke side of the primary metering block provides vacuum for the operation of the
distributor vacuum advance. Connect the hose to the distributor, spark delay valve, and/or temperature sensing valve
as originally connected. Again use “T”s as necessary. If any questions arise about the hose connections, consult the
proper service manual.
7. Connect the PCV hose to the PCV fitting in the carburetor.
8. Connect the power brake hose to the fitting as shown in Figure 6.
9. Connect the fuel line. (Holley® 34-150 or equivalent)
10. In some cases, the existing fuel line will have to be cut and connected to the fuel line assembly from step 9 with a length of
rubber fuel hose and clamp.
WARNING: During the fuel line installation, DO NOT allow any foreign particles to enter the fuel lines, which could
then cause flooding and may result in a fire.
WARNING: Keep the fuel line away from the EGR valve (if equipped) on the intake manifold.
If installation requires cutting the metal fuel line, cut the fuel line with a good tube cutter. This will minimize the chance of
producing metal chip particles. If a hacksaw must be used then metal chips must be removed.
WARNING: In all cases where the fuel line has been cut, it is essential that it be clean to ensure that no metal particles
enter the fuel bowl after the new carburetor installation. Remove the fuel line at the pump and blow the
line clean with compressed air. DO NOT use the procedure where the coil wire is disconnected, the engine
cranked for a few revolutions, and the fuel collected in a container. This procedure is unsafe because
sparking can occur either at the coil or at the distributor end of the coil wire and ignite any fuel spilled in
the engine compartment.
CAUTION: This carburetor contains in line Morain fuel filters. However, the use of a quality in line fuel filter, such as Holley®
P/N 162-523 is mandatory as a safeguard against possible flooding, which could result from unfiltered particles
becoming lodged between the fuel inlet needle and its seat. This can result in fire if a spark is present or backfire
occurs in the engine compartment. Air cleaner filter elements should be blown clean with compressed air at 6,000
miles and replaced at 12,000 miles to ensure maximum protection.