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

    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.

  • 5

    Posted by Dennis Hennagin on May 27th 2020

    This mod helped with top end power on my 7.3

  • 5
    Looks great and good quality

    Posted by Mark Nelson on May 26th 2020

    Big improvement on factory fuel lines truck runs better

  • 5
    Works as advertised but try removing plugs first!

    Posted by Steven.S on May 19th 2020

    Does great, got a bit more power and acceleration, only thing is with the downloadable instructions it says to put the regulator/spring on first then attempt to remove the fuel rail plugs, personally I strongly suggest trying to remove the plugs first just in case they won't budge and one has to get a different tool like I did, ended up pretty much rounding off the front passenger plug with vise grips. Which forced me to get a spiral socket set (5/16) did the trick but I had to reassemble the truck back to stock as this was my daily tow rig and being on a Tuesday evening I needed it for work the next day, should have done it on the weekend but after the plugs broke lose all was well and pretty easy to install. Awesome quality, as expected from RiffRaff.

  • 5
    Awesome upgrade

    Posted by TJ on May 1st 2020

    Great product!! Doesn’t increase horsepower, however it will quiet down the motor on that 7.3 and give better mileage and throttle response ! Bit of a pain to put on but works good

  • 5
    Quality system

    Posted by Jack T. on Apr 4th 2020

    What better way to pass the time in Rona Quarantine than to work on the truck? Had a leaking passenger side fuel line on my 2000 and saw this as well so decided it was time to upgrade. Plugs are a little hard to get out of the heads so get the socket as well. Fuel pressure is right at 64psi now, and she really is smoother running, and no knock and cackle. Perfect fit, well made kit.