My Account
Shopping Cart

Shopping Cart

0 items in your Cart
View Cart
Subtotal
Track
My Order

Holley 121-5 Accelerator Pump Discharge Nozzle Check Needle

Manufacturer

Picture for manufacturer Holley

Part Number

121-5
13 reviews
Sale Price

$22.37

2 left at this price

delivery box

Usually delivered within 2 days

Check out with

ApplePay
Authorize Seller Badge
No Hassle Returns

No Hassle Returns

Live-in-stock inventory

Live-in-stock inventory

Fitment guaranteed

Fitment guaranteed

Product Details

The Holley 121-5 accelerator pump discharge nozzle is an essential component for fine-tuning your carburetor's accelerator pump system. This precision-engineered nozzle allows you to control the rate and pressure of fuel discharge during throttle acceleration.

Key Features:

  • Stamped size marking for easy identification (number indicates nozzle hole diameter in thousandths of an inch)
  • Precision-drilled orifice ensures consistent fuel metering
  • Larger hole sizes deliver faster fuel discharge with lower pressure
  • Smaller hole sizes provide slower, higher-pressure fuel delivery
  • Direct replacement for worn or damaged discharge nozzles
  • Essential for optimizing throttle response and eliminating hesitation

Selecting the correct discharge nozzle size is critical for proper accelerator pump tuning. The nozzle hole diameter directly affects how quickly fuel is delivered into the carburetor venturi during acceleration. Having multiple nozzle sizes on hand allows you to dial in your carburetor for optimal performance across different engine combinations and driving conditions.

Products specifications

Brand

Holley

Category

Air and Fuel Delivery

Color

Silver

Emission Code

5

Grade Type

Performance

Material

Aluminum

Part Type

Carburetor Accelerator Pump Nozzle

Product Type

Nozzle Check Needle

Sub Category

Carburetion

Warning

California Proposition 65

Warranty

Manufacturer's Limited 90 Day Warranty

Exactly as described.

very easy

Fast delivery, great product.

Great in stock items and very fast delivery. Wish website had little more description of item while doing research and price was not cheapest, but cheapest warehouse was out.

Hassle-free shopping

Best Price, Best Shipping

very quick service

I was very pleased with the ease of ordering and delivery time or my order. I have recommended Autoplicity.com to my friends.

I placed my order with ease. The product was delivered free of charge within a week. I am very pleased with all the services provided to make my purchase and delivery easy and expeditious.

Shopping has been great ordered something last week and it was prompt got it in 2 days and was priced really well compared to other places

Lightning fast service! Good prices.

Called and great customer service. Thank you.

I'll start off saying that Autoplicity's prices are unbeatable...but, I placed my order on a Saturday night (which I know is the weekend)on a in stock part and it took them till the following Thursday to ship it out. I use my truck to make a living and was hoping to get it a little quicker, but now I'm down another 3-4 days till the part gets here. Also, I sent a e-mail on Tuesday evening regaurding my order and never got a response.

Share icon
Return Policy
Returns are easy at Boatplicity

Not happy with a purchase? No problem. We've made returning items as easy as possible. And most purchases can be returned for free for 30 days. Learn more about our Returns Policy