Fuel Rail Crossover™ (FRx)

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7.3L Diesel Fuel Rail Crossover™ (FRx) 99-03 Powerstroke

"The Prescription For Your Fuel System Needs®"

Our 2nd Generation FRx™ System utilizes Eaton Aeroquip® 304 Stainless Steel Braided lines covered with a groundbreaking protective layer of HYTREL® from DuPont.

The FRx™ was made to solve the 'deadhead' fuel rail issue on the 99-03 Powerstroke engine by connecting the two heads and allowing a metered return you allow the air another return path, rather than forcing it through your injectors. This product was designed to eliminate the need to cut your return line and use compression fittings, so that it is a true bolt on system. We have also machined the FRx™ block to provide from stock to 72 psi of fuel pressure depending on which spring you choose to install it with. By using our kit and eliminating the air in the fuel system you can experience smoother, quieter idle, less cackle, and better throttle response among other things. You will also be increasing your injector life as well by utilizing the FRx™ and creating a regulated return back to the tank. Protective covers are also pre-installed to prevent chaffing of engine components from the SS braided line. These covers are also great if you want to keep the system looking OE and not draw attention to it once installed.

Included:                                                                                        Techical Info:
- FRx™ System                                                                                  - Exceeds SAE 100R14A
- 3 Springs for adjusting Fuel Pressure                                              - Rated for commercially produced B100
- Viton O-ring                                                                                  - Temperature Rated -100˚F to +450˚F
- Parker® Fuel Sleeve                                                                      - Max. Working Pressure 3000 psi
- 2 mounting bolts                                                                           - Minimum Burst Pressure 12000 psi

Fuel pressure spring settings 
55-60 psi  silver spring
61-65 psi  gold spring *Recommended 
66-72 psi  black spring

Riffraff Diesel Performance is committed to 100% Made in the USA. All materials are from USA resources. Every machining step is performed in the USA. Every component is assembled in the USA.


1999-2003 7.3L Powerstroke with stock fuel bowl
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  • 5
    Awesome little upgrade

    Posted by Scott on Oct 16th 2020

    I had a faint pinging/pre-ignition sound like a gas motor would have. I later diagnosed it to massive amounts of air in the fuel. My in-tank plastic components were totally falling apart. I did the hutch mod, frx, and hpx at the same time. My truck is a 2000 and has never idled so smooth and a bit quieter. Its also smoother on acceleration and highway speeds with what seems to be a little better throttle response as well. I couldn't be happier with the combination of the 3 mods.

  • 5

    Posted by John Fredrickson on Sep 17th 2020

    Easy to install and works like it should. Used the 70lb spring.

  • 4

    Posted by Jim on Aug 7th 2020

    The installation was easier than I had anticipated. The driver side head fitting was a blind install, could not see it at all but was successful first time in attempting to get the threads started. Performance change was minimal, steadied the engine at idle but still have a cackle when the engine heats up. Been chasing this issue forever. Truck is a 2000 with 38K original miles. Overall, very satisfied with the purchase.

  • 5

    Posted by tyler bryant on Aug 4th 2020

    Made my truck quieter and a little better throttle response. I just installed it and drove maybe 40 miles so can’t give too much on the performance but I could tell a difference. Installation was strait forward but frustrating. Mainly the front plug. Do yourself a favor and pick up the 8 point socket they recommend. It was too tight to get vise grips down there. Other than that front plug and the 45 minutes I spent searching for the male fitting I dropped in the valley, it went together pretty easy.

  • 5

    Posted by Rich on Jul 26th 2020

    I have a 1999.5 and I installed the Fuel Rail Crossover FRx, High Flow Banjo Bolt, SS Braided Fuel Hoses and the HPOP crossover all at the same time. Wow what an improvement. I feel better low end power and the engine is so much quieter that before the install. I should have done this a long time ago. While you're in there, add the poppet rebuild kit and put a fuel pressure gauge on the list also.

  • 5

    Posted by Daniel on Jun 30th 2020

    What can i say that hasnt been said already? Great product!

  • 5

    Posted by Alan on Jun 18th 2020

    Excellent quality. Straight forward installation.

  • 4

    Posted by Gordon on Jun 11th 2020

    Nice product. not an easy installation. i wish they would have included the plunger o-ring with the kit, as when i took it apart my existing one was cracked, it would have been nice if they supplied all the seals from the fuel bowl to the fuel crossover.

  • 5
    Great product

    Posted by Ross Priesmeyer on May 27th 2020

    Installation was easy with everything already removed from the engine for a turbo upgrade. I also purchased the branded feed line kit, I recommend doing both, no more leaks and it looks great.