On a Holley 94, the small hole just above the accelerator pump cavity is not a missing plug or defect—it’s intentional. That hole is the pump cavity vent (sometimes referred to as the pump well vent).

Here’s what it does:

• Prevents pressure lock: When the accelerator pump is pushed down, the fuel level in the pump well rises and the air above it needs to go somewhere. The vent hole allows that trapped air to escape. Without it, the pump might hydraulically lock or deliver inconsistent squirts.
• Allows fuel return: On the return stroke, if the pump cup pulls back and fuel expands, the vent gives it a place to bleed off.
• Maintains proper metering: It helps keep the accelerator pump shot consistent by ensuring the pump cavity pressure doesn’t build abnormally.

So—don’t plug it! If fuel is coming out of that hole, that usually means:

1. The pump diaphragm/cup is leaking or installed wrong (fuel bypassing instead of being directed into the discharge circuit).
2. The pump discharge check valve isn’t sealing (so fuel is being forced backward instead of forward).
3. Excess fuel pressure/float level is flooding into the pump cavity and forcing liquid out the vent.