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RADIUM Engineering

RAD 20-0199-06

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The opening and closing of fuel injectors creates pressure pulses in the fuel rail which 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. 

The inline damper is perfect for applications where there is no option for direct fuel rail mounting. 


The FPD-R is shorter than the FPD-XR, allowing it to be used in applications with little clearance. It also has a lower base fuel pressure requirement. 

The FPD-R measures in at 1.98" tall and has a base "static" fuel pressure requirement of 40-70psi. The FPD-XR measures in at 2.60" tall and has a base 'static' fuel pressure requirement of 40-150psi. 

Want more technical information? Read the Radium blog post HERE.


The inline dampers are offered in three different versions and a selection should be made based on the type of hose connection needed.
The -01 version is a great option when using 5/16" rubber fuel hoses. Hose clamps are required.
The -06 version comes with adapter fittings for connecting -6AN hoses
The -08 version comes with adapter fittings for connecting -8AN hoses
*versions are related to the part number. You're currently viewing -06 version.


-Anodized/laser engraved aluminum top, R=range or XR=extra range
-Anodized aluminum body with female -8AN ORB ports
-Anodized aluminum ORB adapter fittings, selectable size
-Gasoline and alcohol (E85) resistant diaphragm
-Stainless steel M6 mounting bolts and nuts
-Rubber vacuum hose, 4mm ID
-Vacuum hose Y-fitting 
-1/8" NPT plug

Returns Policy

--PLEASE NOTE: MOST ORDERS ARE SUBJECT TO RESTOCK OR CANCELATION FEE. PLEASE CALL OUR OFFICE FOR DETAILS AND EXCEPTIONS-- You may return most new, unopened items within 30 days of delivery for a full refund. We'll also pay the return shipping costs if the return is a result of our error (you received an incorrect or defective item, etc.).

You should expect to receive your refund within four weeks of giving your package to the return shipper, however, in many cases you will receive a refund more quickly. This time period includes the transit time for us to receive your return from the shipper (5 to 10 business days), the time it takes us to process your return once we receive it (3 to 5 business days), and the time it takes your bank to process our refund request (5 to 10 business days).

If you need to return an item, simply login to your account, view the order using the 'Complete Orders' link under the My Account menu and click the Return Item(s) button. We'll notify you via e-mail of your refund once we've received and processed the returned item.


We can ship to virtually any address in the world. Note that there are restrictions on some products, and some products cannot be shipped to international destinations.

When you place an order, we will estimate shipping and delivery dates for you based on the availability of your items and the shipping options you choose. Depending on the shipping provider you choose, shipping date estimates may appear on the shipping quotes page.

Please also note that the shipping rates for many items we sell are weight-based. The weight of any such item can be found on its detail page. To reflect the policies of the shipping companies we use, all weights will be rounded up to the next full pound.

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