Quick Fuel Technology MARINE SERIES CARBURETORS - Manual (Page 3)

" Manifold vacuum is typically used for transmission modular or any accessory
that requires a full manifold vacuum signal, i.e. heat and/or A/C control, vacuum actuated fresh air induction, etc. . The
Ported or timed vacuum is typically used for the vacuum advance canister on the distributor if applicable. NOTE: some
distributor vacuum advance canisters require full manifold vacuum, not ported or timed vacuum.
Check the specifications for your distributor.
8. Install fuel inlet fittings DO NOT USE TEFLON® TAPE ON INVERTED FLARE FUEL INLET FITTINGS. Clean
threads and flare of any dirt and debris before installation. Check to be certain the fuel inlet fittings in the fuel bowl
are tight, then install the fuel line nuts. Tighten sufficiently to prevent fuel leakage.
9. Connect positive (+) wire for electric choke to an key on 12 volt voltage source. DO NOT CONNECT TO THE
BATTERY SIDE OF THE IGNITION COIL. Preferably check voltage with a volt meter to determine the correct
voltage. NOTE: battery voltage will be 12 volts or greater. You need to recheck the voltage reading when the engine
is running to be certain the voltage does not drop below 12.6 volts. (Some engines use a field wire from the
alternator that only produces 9.5 volts which does not allow the choke to operate properly.)
Starting the Engine
1. Reattach the negative battery cable, you are now ready to start the engine.
2. You are now ready to start the engine.
3. Before attempting to start; the fuel bowls need to be filled with fuel. Whether you have an electric fuel pump or a
mechanical pump, it is necessary to operate the fuel pump for 15 seconds or so, a couple of 10 second cranks for
mechanical pumps, to enable the bowls to fill with fuel.
4. Before starting the engine make an initial check of the float level. If fuel is not visible in the sight glass. This
carburetor was pre-set at the factory to be in the middle of the sight glass at 6.5 P.S.I. Fuel pressure greater than 6.5
P.S.I. will cause the float level to be too high. Conversely, if the fuel pressure is significantly below 6.5 P.S.I. the float
level will be too low. For the carburetor to operate correctly the float levels must be in the middle of the sight glass.
The most accurate way to establish the correct float level is to check it while the engine is running. If the initial float
level is not visible in the sight glass then it might be necessary to re-adjust the float level before starting the engine.
5. With the float level verified and correct, rotate the throttle to wide open twice. If the temperature is below 72 degrees,
the choke will close and the accelerator pump nozzles should discharge fuel. You can now start the engine.
6. It should not be necessary to continue operating the throttle while attempting to start the engine. If it does not start on
the first attempt, rotate the throttle a couple of additional times, then try starting the engine again.
7. If the engine still will not start, try holding the throttle open slightly while starting in the event to much fuel entered the
engine while operating the throttle or the idle speed might be too low for your application.
(+) Ignition activated 12V source
(-) Grounded to carburetor
Raise or Lower Float with a 5/8” wrench
Set fuel level in middle of window with engine running at
idle speed with proper fuel pressure
(note the arrows in the casting)
DO NOT ADJUST WITH ENGINE RUNNING