This complete replacement diaphragm and spring assembly is designed for Holley's -30 and -40 series Ultra HP mechanical fuel pumps, including the 12-327-30, 12-454-30, 12-454-40, and 12-289-30.
Specifications:
- Brand: Holley
- Category: Air and Fuel Delivery
- Component Type: Diaphragm Kit
- Product Type: Fuel Pump Component
- Sub Category: Service Kits
- Warranty: Manufacturer's Limited 90 Day Warranty
- Part Number: 12-755
Fits Holley 12-327-30, 12-454-30, 12-454-40, and 12-289-30 mechanical fuel pumps.
FAQ
Which fuel pumps is this diaphragm assembly compatible with?
It fits Holley 12-327-30, 12-454-30, 12-454-40, and 12-289-30 mechanical fuel pumps.
What does the kit include?
It includes a complete diaphragm and spring assembly.
Is this for a low-pressure or high-pressure pump?
This is the low-pressure diaphragm assembly.

