Float Level Check And Adjustment - Holley 0-80508S Installation, Tuning, And Adjustment Manual

FLOAT LEVEL CHECK AND ADJUSTMENT:

FOR 0-80508S, 0-80783C, 0-3310C, 0-3310S:
Primary and secondary float adjustments are set at the factory, but variations in fuel pressure could cause a change in these settings.
The following procedure shows how to make these adjustments:
1. Start the vehicle.
2. Observe the sight plug for the fuel level. If none is seen, the level is too low. Fuel should be even with the bottom of the sight plug
hole. If fuel comes pouring out of the sight hole, the float is set too high.
NOTE: A properly set float level will have the fuel level located at the bottom edge of the sight hole, as shown by the line in 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 float and counterclockwise to raise
float.
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 plug hole.
9. Repeat steps 1 through 8 as necessary.
Figure 12
11