Nuke Performance FPD70s Fuel Pulse Damper AN 8 ORB

Nuke Performance FPD70s fuel pulsation damper 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 Pulsation Damper (FPD) is designed to reduce these pulsations, resulting in 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 fuel, including alcoholic fuels such as E85

Vacuum/boost reference capability

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

What is a fuel pulsation damper and how does it work?

Every time a fuel injector opens and closes, it creates a small pressure pulsation within the fuel system. Individually, these pulsations are insignificant, but together they create high-frequency pressure fluctuations that travel through the fuel rail and lines. Although they are often too fast to be detected on a conventional fuel pressure gauge, they can influence fuel pressure stability, especially in high-performance EFI systems using large injectors and high-flow fuel pumps.

A fuel pulsation damper is designed to absorb these pressure fluctuations before they propagate through the fuel system. By using an internal diaphragm, the damper smooths out pressure variations, contributing to more stable fuel pressure, more uniform fuel delivery, and a fuel system that is easier to calibrate and tune.

How do I choose the right fuel pulsation damper for my fuel system?
Choosing the right fuel pulsation damper starts with a measurement: the base fuel pressure. This pressure is measured with the fuel pump running and the vacuum hose disconnected from the pressure regulator.

Standard pressure range FPD70s fuel pulsation damper

If the measured base fuel pressure is between 40 and 70 PSI, the standard pressure range FPD70s is the recommended choice for most electronic fuel injection (EFI) systems.

Extended pressure range FPR110x fuel pulsation damper

If the base fuel pressure exceeds 70 PSI, choose the extended pressure range FPD110x, designed for fuel systems that require operation outside the standard pressure range.

Both versions incorporate a vacuum/boost reference feature, allowing the diaphragm to stay properly positioned as fuel pressure varies during engine operation. This keeps the diaphragm operating within its intended range and provides consistent damping performance across a wider pressure range.

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

Optional vacuum/boost reference with integrated port.

5mm barb fitting and locking plug included with all dampers.

Every fuel pulsation damper includes a 5mm vacuum hose barb fitting and a locking plug for installations where vacuum/boost reference is not required. For customers who prefer rigid plastic tubing, the optional quick-connect fitting for 6mm tubing provides a clean, secure, and quick-connect solution.

M5 Pneufit quick connector for 6mm tubing. Part No: 122-10-001

Where should a fuel pulsation damper be installed? For maximum effectiveness, a fuel pulsation damper should be installed as close to the fuel injectors as possible, as that is where the pressure pulsations originate. Therefore, direct installation on the fuel rail is 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, Nuke Performance in-line fuel pulsation dampers offer an alternative by installing them near the fuel rail. The AN-6 ORB and AN-8 ORB versions can also be mounted directly into the auxiliary ports of Nuke Performance fuel pressure regulators, allowing for a clean and compact installation without extra adapters or unnecessary piping.

Why choose the Nuke Performance fuel pulsation damper for my high-performance fuel system?

The Nuke Performance fuel pulsation damper is available in two specific 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 setups.
Thanks to its integrated vacuum/pressure reference capability, fully rotating housing, and high-precision CNC-machined solid aluminum construction, each fuel pulsation damper is specifically designed for its intended application, offering consistent damping performance, flexible installation, and reliable operation across a wide range of electronic fuel injection (EFI) systems. Fuel pulsation 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 fitting included

Fuel compatibility:
Gasoline, methanol, ethanol, E85

Swivel function:
YES, 360° rotation

Height (assembled):

44.1 mm (1.73")

Width/Cross-section:
37.0/46.8 mm (1.45/1.84")

Weight:
74.0 g (2.60 oz)

For motorsport use:
YES, for motorsport use only

Part No. AN-6 / EAN:
122-01-201 / 7340209512151

Fuel pulsation damper, FPD70s AN-8 specifications:

Connection thread
AN-8 ORB

Base fuel pressure range
2.75 - 4.80 BAR (40-70 PSI)

Vacuum/boost port
M5 5mm barb fitting included

Fuel compatibility
Gasoline, methanol, ethanol, E85

Swivel function
YES, 360° rotation

Height (assembled)

33.3 mm (1.31")

Width/Cross-section
37.0/46.8 mm (1.45/1.84")

Weight
77.0 g (2.71 oz)

For motorsport use
YES, for motorsport use only

Part No. AN-6 / EAN

122-01-202 / 7340209512168

Fuel pulsation damper, FPD70s 3/8 NPT specifications:

Connection thread

3/8 NPT

Base fuel pressure range

2.75 - 4.80 BAR (40-70 PSI)

Vacuum/boost port

M5 5mm barb fitting included

Fuel compatibility

Gasoline, methanol, ethanol, E85

Swivel function

Yes, 360° rotation

Height (assembled)

34.3-39.0 mm (1.35/1.53")*

Width/Cross-section

37.0/46.8 mm (1.45/1.84")

Weight

89.0 g (3.13 oz)

For motorsport use

Yes, for motorsport use only

Part No. AN-6 / EAN

122-01-203 / 7340209512175

*depending on thread mounting depth
Fuel pulsation damper FPD70s includes:

1 x FPD70s Fuel Pulsation Damper (chosen thread)

1 x M5 to 5mm vacuum fitting

1 x Stainless steel K6S M5x6mm locking screw