Nuke - Fuel Pulse Damper, FPD70s (AN6)

NUKE - Fuel Pulse Damper, FPD70s (AN6)

Nuke Performance Fuel Pulse Damper FPD70s with 360° swivel design, engineered for stable fuel pressure. Standard pressure range, 40-70 PSI.

Modern EFI fuel systems generate high-frequency pressure pulsations during injector operation. The Nuke Performance Fuel Pulse Damper (FPD) is engineered to reduce these pulsations, creating smoother fuel pressure and more consistent fuel delivery.

•  FPD70s, for standard pressure range, 40-70 PSI
•  Reduces high-frequency pressure pulsations
•  Direct-mount with AN-6 ORB / AN-8 ORB / 3/8 NPT connections
•  Safe for all types of fuels, including alcoholic fuels such as E85
•  Vacuum / boost reference capable

Designed for EFI fuel systems operating with a base fuel pressure between 40 and 70 PSI, the FPD70s combines a precision billet aluminum body with an optimized diaphragm and spring assembly. The fully rotatable housing simplifies installation, while the integrated vacuum/boost reference keeps the diaphragm correctly positioned as fuel pressure changes.

What is a fuel pulse damper, and how does it work?
Every time a fuel injector opens and closes, it generates a small pressure pulse within the fuel system. Individually, these pulses are insignificant, but together they create high-frequency pressure fluctuations that travel throughout the fuel rail and fuel lines. Although often too rapid to appear on a conventional fuel pressure gauge, they can still influence fuel pressure stability, particularly in high-performance EFI systems using large injectors and high-flow fuel pumps.

A Fuel Pulse Damper is designed to absorb these pressure fluctuations before they propagate through the fuel system. Using an internal diaphragm, the FPD smooths pressure variations, contributing to more stable fuel pressure, more consistent fuel delivery, and a fuel system that is easier to calibrate and tune.

How do I choose the right fuel pulse damper for my fuel system setup?
Choosing the correct Fuel Pulse Damper starts with one measurement: your base fuel pressure. Base fuel pressure is measured with the fuel pump running and the vacuum hose disconnected from the fuel pressure regulator.

FPD70s Standard Pressure Range Fuel Pulse Damper
If your measured base fuel pressure is between 40 and 70 PSI, the FPD70s Standard Pressure Range is the recommended choice for most EFI fuel systems.

FPR110x Extended Pressure Range Fuel Pulse Damper
If your base fuel pressure exceeds 70 PSI, choose the FPD110x Extended Pressure Range (NUK- 122-01-211/2/3), engineered for fuel systems requiring operation beyond the Standard Pressure Range.

Both versions feature integrated vacuum/boost reference capability, allowing the diaphragm to remain correctly positioned as fuel pressure changes during engine operation. This keeps the diaphragm operating within its intended working range and provides consistent damping performance across a wider pressure window.

Why use the vacuum/boost reference on a fuel pulse damper?
The integrated vacuum/boost reference keeps the diaphragm correctly positioned as fuel pressure changes during engine operation, ensuring consistent damping performance over a wider pressure range.

• Optional vacuum/boost reference with the integrated port
• 5mm barb fitting and block-off plug included with all dampers

Every Fuel Pulse Damper includes a 5 mm vacuum hose barb and a block-off plug for installations where vacuum/boost reference is not required. For customers preferring hard plastic tubing, the optional Quick Connect to 6 mm tubing (available here) provides a clean and secure quick-connect solution.

Where should a Fuel Pulse Damper be installed?
For maximum effectiveness, a Fuel Pulse Damper should be installed as close to the fuel injectors as possible, since this is where the pressure pulsations originate. Direct installation on the fuel rail is therefore the preferred solution whenever possible.

•  Available with AN-6 ORB / AN-8 ORB / 3/8 NPT connections
•  360° swivel design for easy installation

When direct mounting is not possible, the Nuke Performance In-line Fuel Pulse Dampers (available here) provide an alternative when installed close to the fuel rail. The AN-6 ORB and AN-8 ORB versions can also be mounted directly into the auxiliary ports on Nuke Performance Fuel Pressure Regulators, providing a clean and compact installation without additional adapters or unnecessary plumbing.

Why choose the Nuke Performance fuel pulse damper for my high-performance fuel system?
The Nuke Performance Fuel Pulse Damper is available in two dedicated pressure ranges, Standard Pressure Range (40–70 PSI) and Extended Pressure Range (40–110 PSI), allowing the diaphragm and spring assembly to operate within the correct working range for different fuel system configurations.

Combined with integrated vacuum/boost reference capability, a fully rotatable housing, and precision CNC-machined billet aluminum construction, every Fuel Pulse Damper is purpose-built for its intended application, delivering consistent damping performance, flexible installation and reliable operation across a wide range of EFI fuel systems.

There is no substitute for the quality of Nuke Performance.

Fuel Pulse Damper, FPD70s AN-6 Specifications:

•  Connection thread: AN-6 ORB
• Base fuel pressure range: 2.75 - 4.80 BAR (40-70 PSI)
• Vacuum/Boost port: M5 - 5mm barb connection included
• Fuel compatibility: Gasoline, Petrol, Methanol, Ethanol, E85
• Swivel function: YES, 360° rotation
• Height (mounted): 44.1mm (1.73")
• Width/Cross section: 37.0/46.8mm (1.45/1.84")
• Weight: 74.0g (2.60oz)
• For motorsports use: YES, only for motorsports use

Fuel Pulse Damper, FPD70s includes:

• 1 x FPD70s fuel pulse damper
• 1 x M5 to 5mm barb vacuum fitting
• 1 x K6S M5x6mm stainless steel block-off bolt

 Download Product Sheet 

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