Radium Engineering Direct Mount Fuel Pulse Damper
Opening and closing of fuel injectors can create pressure pulses within the fuel rail, leading to unstable fuel pressure. A Fuel Pulse Damper (FPD) is necessary to achieve stable pressure within the fuel rail. The diaphragm inside the FPD absorbs these vibration pulses to stabilize fuel pressure. This correction is effective across all engine RPM ranges and has been proven especially effective for surging issues at idle when using high-capacity injectors.
This fuel pulse damper can be mounted at any angle. It is compatible with all fuels, including not only regular gasoline but also alcohol and E85.
You can choose from 4 types to match your vehicle.
*Not for use on the low-pressure side of mechanical fuel pumps
Differences between FPD-R and FPD-XR
The FPD-R (green top) is more compact than the FPD-XR (black top), making it recommended for vehicles with limited installation space. There is a difference in the maximum allowable fuel pressure for each.
*If you have sufficient installation space, we recommend using the FPD-XR, which has a higher allowable fuel pressure.
FPD-R: 40-70psi (2.8 - 5.0kg/cm2)
FPD-XR: 40-105psi (2.8 - 7.4kg/cm2)
Selecting the 8AN ORB type allows you to rotate the vacuum port 360 degrees without tools even after the damper has been tightened, enabling a variety of hose routing options.
Installation instructions (English only) can be found here.
●Optional Parts●
6AN ORB Male to 8AN ORB Female 14-0600
(Used when installing on a 6AN ORB (9/16"-18) fuel rail port)
Simply install this adapter fitting into the pulse damper port.
*Not compliant with Japanese vehicle inspection (Shaken); for competition use only.
*Please ensure you fully understand and verify your vehicle's specifications before ordering and installing (bolts used, tightening torque, thorough retightening, etc.).
*Due to international shipping, orders may take time to arrive. If you are in a hurry, please contact us before ordering.
Before Ordering
〇 Regarding Import Consumption Tax
At the Shaftoya shopping site, we pay the import consumption tax incurred at the time of import on your behalf, so there will be no additional charges beyond the total paid at checkout.
〇 Verification of Compatibility
All product databases are based on North American specification vehicles (USDM), so please check for compatibility with Japanese specification vehicles (JDM) before ordering. (If you are unsure if a listed product is compatible with your vehicle, please feel free to contact us. Our support team will investigate for you.)
If you order without confirming compatibility, we cannot accept returns due to incompatibility.
Please note that even if items are sorted by selecting the year, manufacturer, and model using the tabs on our top page, this does not guarantee that they will fit Japanese models without modification.
All products have been translated into Japanese using translation software. As there may be confusing expressions, please contact us before ordering if you have any questions.
○ Regarding Shipping
Shipping costs are paid at the time of settlement. An estimate for shipping can be calculated automatically by entering your delivery address on the checkout page. For large items such as body parts, there are rare cases where the automatic shipping calculation differs significantly from the actual cost. In such cases, we will contact you individually via email.
All products are generally shipped internationally from our US warehouse. Unlike domestic Japanese shipping, international shipping takes about 7 to 14 days, so please allow yourself plenty of time when ordering. If you are in a hurry, please contact us in advance to confirm delivery times. Note that all items are shipped via air freight; they will not be sent by sea freight.
○ Regarding Japanese Vehicle Inspection (Shaken) Compatibility
Please note that all products we handle are designed and manufactured outside of Japan. They are not compliant with the "Japanese vehicle inspection system," and we cannot provide strength calculation documents or similar paperwork for such purposes. Therefore, all parts are sold for the purpose of "circuit use, private property use, or off-road use," and installation and usage are at your own risk.
○ Regarding Warranty
Please check the contents immediately upon arrival. As all products are shipped internationally from outside Japan, packaging and products may sustain shipping damage. We will only provide returns, refunds, or replacements for products with shipping damage, defective items, or items different from what was ordered if you contact us within 7 days of receipt. Please understand that for products sold through us, we provide warranty support "only through us." We do not provide support through other companies or distributors located within Japan.