Radium Engineering FPR Wide Range Spring - Stainless Steel (MPR, DMR, FST-R)

The Radium Engineering Wide Range FPR Spring is a stainless steel replacement spring for Radium adjustable fuel pressure regulators. It allows base fuel pressure adjustment from 20 psi and up and is engineered to improve linear adjustment between 60 psi and 80 psi. It is a drop in replacement that requires no additional parts and comes standard in all applicable units produced from November 2016 onward.

Specifications

Shipping

• In-stock orders placed before 3 PM EST ship the same day — everything else ships within 24 hours.
• Standard, expedited, and overnight options at checkout.
• Oversized items ship by freight and take longer.
• Backordered items ship as soon as stock lands — contact us for lead times.
• International orders: prices do not include VAT, duties, or import fees. Your country charges these at import and they are the buyer’s responsibility.

Returns

• 30-day returns on new, uninstalled items in original packaging with all hardware.
• Standard returns: 8% restocking fee, buyer pays return shipping. Both waived if the item is defective or we made the error.
• Installed or used parts can’t be returned — confirm fitment before you install.
• Special orders and custom items are final sale.
• Email us for return authorization before shipping anything back.

Full details: Shipping Policy · Refund Policy