Service manual

FLOAT LEVEL ADJUSTMENT:

NOTE: Do not try to remove the sight glasses. It takes special tools to install these and it is not recommended that they be

removed.

Primary and secondary float adjustments are set at the factory, but variations in fuel pressure could cause a change in these

settings. To aid in adjustment of the float levels, clear sight glasses are installed from the factory. The following procedure

shows how to make these adjustments:

1. Start the vehicle.

2. Observe the sight glass for the fuel level. If none is seen, the level is too low. If it is higher than the middle of the sight

window, it is too high. NOTE: A properly set float level will have the fuel level located at the middle or slightly below the

middle of the sight window, as shown by the line in Figure 12.

Figure 12

3. To adjust, shut down the engine.

4. Loosen the lock screw on top of the fuel bowl just enough to allow you to turn the adjusting nut. Hold the screw in position

with the screwdriver.

5. Using a 5/8” wrench, turn the adjusting nut in the appropriate direction: Clockwise to lower fuel level and

counterclockwise to raise the fuel level.

NOTE: Many customers attempt to adjust the float level down by turning the adjusting nut clockwise, only to see the

fuel level rise through the sight glass. This is due to the float being pushed down into the fuel, therefore

displacing the fuel to a higher level. You will find it easier to adjust the float levels, if you rev the engine

slightly between adjustments to evacuate the fuel.

6. Turn the adjusting nut in increments of 1/4 of a rotation.

7. Retighten the lock screw.

8. Restart the vehicle and observe the sight window.

9. Repeat steps 1 through 8 as necessary.

SECONDARY FLOAT LEVELS:

Very little fuel is drawn out of the secondary fuel bowls during idle operation. This makes it a little tricky to set the proper float

level with the sight glasses. Many customers attempt to adjust the rear float level down by turning the adjusting nut clockwise,

only to see the fuel level rise through the sight glass. This is due to the float being pushed down into the fuel, therefore

displacing the fuel to a higher level. You will find it easier to adjust the float levels, if you rev the engine slightly by opening the

secondaries between adjustments. This can be easily done by rolling the secondary throttle shaft linkage forward on the driver’s

side of the vehicle. This will use fuel from the secondary bowl at a much faster rate, allowing the float level to seek the

adjustment point that you have set. Once the floats have been set with this procedure, drive the vehicle, and recheck the float

level.