750 vs 850 vs 950 Holley
Possible idle feed restriction locations are marked as follows:
H High position (at the junction with the air bleed passage)
P Below the plug in the metering block.
L Low position.
Fuel is shown at bowl level. That is, engine not running.
When the manifold vacuum is pulling pretty steady, even with the High position, the fuel will move up the well and through the restriction.
But when the pressure difference is strongly pulsing, the fuel in the well may easily drop back to the bowl level.
I like pictures. :)
Possible idle feed restriction locations are marked as follows:
H High position (at the junction with the air bleed passage)
P Below the plug in the metering block.
L Low position.
Fuel is shown at bowl level. That is, engine not running.
When the manifold vacuum is pulling pretty steady, even with the High position, the fuel will move up the well and through the restriction.
But when the pressure difference is strongly pulsing, the fuel in the well may easily drop back to the bowl level.
