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Holley

HOLLEY Accelerator Discharge Check Needle

MPN: 121-5 Catalog #: 001508793 Category: Carburetor Discharge Nozzles Check Vehicle Fitment

Product Details

Discharge Check Needle - Accelerator Pump - Holley Carburetors - Pair

Accelerator Pump Discharge Nozzle Check Needle; Replacement; For Holley 4150/4160/4500 Series Carburetors;

A good selection of accelerator pump discharge nozzle sizes is indispensable to the proper tuning of the accelerator pump system. The nozzle hole size determines the rate of fuel discharge. A larger hole will shoot the fuel at a faster rate, and with less pressure, than a smaller hole. Sizes are stamped on each nozzle. For example, the number 31 indicates that the nozzle hole size is .031-inches. Various styles of nozzles are offered by Holley.

Fitment: Replacement pump discharge needles for all Holley 4150; 4160; and 4500 series carburetors.

DETAILS:

Part Number 121-5 SPECS:

DETAILS:

  • Holley Performance Emission Code 5: This part is legal for sale or use on Emissions Controlled Vehicles; Uncontrolled (Non-Emissions Controlled) Vehicles; and Racing Use Only Vehicles because it does not affect vehicle emissions and is not covered by emissions regulations
  • Carburetor Accelerator Pump Nozzle
  • Accelerator Pump Discharge Nozzle Check Needle
  • Includes 2 Gaskets
  • Replacement Part
  • ACCELLERATOR DISCHG CHECK NEEDLE
  • CrbAclPmpNzz

Part Number 121-5 SPECS:

  • Color: Silver
  • Material: Aluminum
  • WARNING CA Proposition 65: No

Vehicle Fitment

Universal or product-specific fitment. Please review the product details and contact us if you need help confirming fitment before ordering.

Product Specs

Brand
Holley
Part Number
121-5
Catalog Number
001508793
Product Line
Carburetor Discharge Nozzles
Category
Fuel Delivery
Type
Carburetor Discharge Nozzles
UPC / Barcode
090127619780
Length
5.00 in
Width
3.50 in
Height
0.50 in
Weight
0.02 lb
Freight / LTL
175.00
Ship Alone
No
Air Restricted
No
Hazmat
No
Chemical
No
Non-Returnable
No
Case Quantity
1
Kit
No

Shipping & Availability

Current status 3 Available - Ready to ship
Estimated timing Usually ships within 24hrs

This item is showing available inventory. Most in-stock performance parts ship quickly, but timing can vary by warehouse, vendor cut-off time, holidays, and carrier pickup.

Inventory shown: 3 available as of 6/3/2026.

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