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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  • 4
    Quality product

    Posted by Patrick Devine on Dec 16th 2018

    A few choice words some busted knuckles and 2 trips to the parts store I got the frx on and she’s running smoother than ever! Put a zip tie on the return line so the fitting can’t fall down the line like mine did..... pain in the *** but totally worth it

  • 5
    Innovative solution

    Posted by Chris on Dec 13th 2018

    Fairly easy install, and great quality product. So nice to have an American made product for a great price.

  • 5
    Delivered Big Time

    Posted by Corey on Dec 11th 2018

    No idea what the one low star review is talking about. I called with questions and they had concise, accurate answers for install. Great quality product, and it smoothed my ol' 7.3L right out.! Recommend these guys every chance I get.

  • 5
    Fuel rail crossover

    Posted by Toby on Nov 24th 2018

    My mechanic suggested this when I asked him what I needed next in my 7.3.....Happy to say he was right!!! Immediately noted marked increase in responsiveness!!!

  • 5

    Posted by Ted on Oct 19th 2018

    This saved me about $400! Just a cleaner, more simplistic, engineered piece versus complete bowl delete kit.

  • 5

    Posted by Paul Quinn on Oct 18th 2018

    Great Product

  • 5
    Quality - Affordable

    Posted by Unknown on Oct 11th 2018

    What a well made part. Instructions were great, and everything I needed was included.

  • 5
    It just works...

    Posted by Paul on Sep 27th 2018

    Smoothed out my engine, and seems to start faster now as well. Great instructions and great customer service when I called to ask about install.

  • 2
    Did not deliver

    Posted by Unknown on Sep 27th 2018

    When I put the crossover on, it seemed to make my injectors louder. I made sure the spring was in right. When I called and asked about and getting a refund I was basically told so sad to bad. Not impressed with there customer service or product. It did not deliver