The opening and closing of fuel injectors creates pressure pulses in the fuel rail; this can lead to unstable fuel pressure. In order to achieve a safe and consistent rail pressure a fuel pulse damper (FPD) is often necessary. The FPD's internal diaphragm will absorb oscillating pulses and stabilize fuel pressure. This correction can be measured throughout the RPM range and can often help idle surge especially with high flow injectors. Furthermore a fuel pulse damper can help solve erratic lean air/fuel ratio spikes commonly experienced as "stumbling" that are difficult to tune out. 

Fuel pulse dampers can be mounted at any angle including upside down. There are many variables that dictate if a fuel system requires fuel pulse dampers. For instance there are cases where multiple dampers are necessary. There are also other times when the fuel system benefits with a fuel pulse damper on the return line. 


What makes Radium FPDs unique?
Along with having the flexibilty of using common fittings Radium Engineering FPD's use a vacuum/boost reference port which allows for proper fuel pulse damper performance even at elevated fuel pressures. This becomes essential for boosted systems that use a 1:1 rising rate fuel pressure regulator.

What is the difference between FPD-R and FPD-XR? 
The FPD-R (green top) is slightly shorter than the FPD-XR (black top) allowing it to be used in space-contrained applications.

WHICH DAMPER DO I CHOOSE?
The FPD-R (Fuel Pulse Damper-Range) and FPD-XR (Fuel Pulse Damper-Extra Range) both have unique base "static" fuel pressure requirements:
FPD-R base pressure requirement = 40 - 70psi (static)

FPD-XR base pressure requirement = 40 - 105psi (static)

Base pressure is the fuel pressure measured when the fuel pump is running WITHOUT a vacuum line connected to the regulator.

IMPORTANT: The ranges above are base static fuel pressures only. Any dynamic fuel pressure created by a rising-rate FPR outside of this range is acceptable but only when the base "static" fuel pressure is set within these ranges and the vacuum/boost reference line is connected.

Example 1:
Vehicle: Mitsubishi EVO
OEM Base Static Fuel Pressure: 43.5psi
Boost Pressure: 30psi
Rising Rate Pressure Regulator? Yes
Can I use a FPD-R? Yes. Even though fuel pressure is 73.5psi at full boost the FPD-R will work because the base static pressure was set within the 40-70psi requirement. However the vacuum/boost reference line must be installed. 
Can I use a FPD-XR? Yes. Also the vacuum/boost reference line does not need to be installed since maximum fuel pressure does not exceed 105psi. 

Example 2:
Vehicle: BMW E46 M3
OEM Base Static Fuel Pressure: 72.5psi
Boost Pressure: 20psi
Rising Rate Pressure Regulator? Yes
Can I use a FPD-R? No. Base static fuel pressure exceeds the 40-70psi requirement.
Can I use a FPD-XR? Yes. Also the vacuum/boost reference line does not need to be installed since maximum fuel pressure does not exceed 105psi.

Features
1. Male Fitting Selection:
a. The 8AN ORB versions seal using a FKM O-ring. 
b. The 3/8" NPT variations seal with the tapered pipe threads. 

2. Vacuum Port Orientation:
a. Because 20-0178 and 20-0179 use tapered threads (NPT) the vacuum port can be clocked to the desired location.
b. Even after tightened the newest 8AN ORB dampers (20-0776 and 20-0777) will swivel permiting the vacuum port to be clocked 360 degrees. 20-0776 shown below.

3. This product is safe for use with all fuel types including alcohol blends such as E85. 

Included

-Anodized and laser engraved aluminum top R=range or XR=extra range
-Anodized aluminum body with male threads 8AN ORB or 3/8" NPT
-Stainless steel hardware
-Rubber vacuum hose 4mm ID
-Vacuum hose Y-fitting 

Part number 20-0776 shown above. Part number 20-0777 shown below.

Evolution Racing Spares aims to have fast turnaround time for processing and handling orders, and will always make every effort to get the order to you as soon as possible.

Small items: 1-3 Days via Express Post Satchel
Medium Sized Items: 2-3 working days via AusPost Express or Courier (Depending on location)

Large Items: 2-8 working days (Large items can only be sent via courier, and delivery time depends on both courier and location

- Delivery to rural or remote areas, NT, WA, and TAS may take longer.

- Express Post shipping is only valid to areas that fall within the express post zone and is not guaranteed.

- Evolution Racing Spares may use the quickest carrier/method for delivery regardless of the method chosen at checkout.

- Typical handling time for items that are in stock is approximately 24-48 hours, with delays during holiday periods and public holidays.

- Evolution Racing Spares is not responsible for lost or damaged orders when customers change the delivery instructions to "authority to leave."

All goods sold and work performed by Evolution Racing Spares come with a 3-month warranty with no questions asked.

In accordance with the Australian Consumer Law, we are not required to provide a refund or replacement if you change your mind.

You can choose a refund or exchange if an item has a major problem, including:

• A problem that would have stopped you from buying the item if you had known about it
• The item is unsafe
• The item is significantly different from the sample or description
• The item doesn't do what we said it would, or what you asked for and can't be easily fixed

Alternatively, you can choose to keep the item and we will compensate you for any drop in value.

• If the problem is not major, we will repair the item within a reasonable time.
• If the item is not repaired in a reasonable time, you can choose a refund or replacement.

Please keep your proof of purchase such as your receipt.