Fuel Rail Crossover™ (FRx)

Part Number:
FRx

Manufacturer:

$209.13
$209.13
$197.88
(You save $11.25 )

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 Stainless mounting bolts                                                             - Minimum Burst Pressure 12000 psi
- Custom 9/32" socket

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.

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1999-2003 7.3L Powerstroke with stock fuel bowl
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  • 5
    Best 7.3 Mod

    Posted by Jason on Sep 10th 2023

    Should have been this way from the factory. My injector are quieter and smoother. Good instructions and the special socket was even included in the kit.

  • 5
    Fuel rail crossover

    Posted by Ben M on Jul 22nd 2023

    Definitely a great purchase for my 7.3 Powerstroke. Install was simple and quick. Literally had it in under 15 minutes. Best upgrade to date. Would recommend this to anyone with a 7.3

  • 5
    Fuel rail easy install

    Posted by Guy on Jul 21st 2023

    Not a difficult install at all. Everything fit perfectly. Follow the video instructions.

    I have waited a month to review. My observation is that it did quiet the motor at idle. It also made a slight drivability improvement; a pinch better throttle response. Used recommended spring for a stock motor. I have no chip, and a stock compressor wheel.

  • 5
    FRx Fuel Return

    Posted by Ross S on Jul 15th 2023

    Received product on time. Ordered from RD2 Fuel Systems. All parts are great quality and made right. Simple install. Truck had injector #8 cackle that almost sounded like a misfire. Installed kit and cackle is gone. Truck has never idled smoother. Highly recommend

  • 5
    FRx Crossover

    Posted by Taylor on Jul 3rd 2023

    Wow! Quality and packaging were superior. Machining was precise and well finished. Fittings were crimped for a perfect install. Fast shipping. They even started to include the square socket everybody bitches about….that’s going to the next level. Just pissed they didn’t include a Riff Raff custom ratchet too. Loved purchasing from a Christian company. I probably won’t buy from another diesel parts provider again. Give these guys your business!

  • 5
    Fuel Rail cross over

    Posted by Ernie on Jun 2nd 2023

    This made a crazy improvement on my throttle response and now my fuel pressure is where it is supposed to be Love it still waiting to see fuel mileage

  • 5
    This is a must for a 7.3. Changes the whole game

    Posted by Bilal Tariq on May 7th 2023

    I bought this a while back and tried myself to put it on and ended up stripping the driver side plug but my mechanic managed to get it done. After the installation I was like wowwwwww. What a huge difference in how the truck runs. Trust me if u dont have this in your truck you are missing out on a hugeeeeeeee upgrade kind of a challenge to get the driver side but worth every effort. Thanks Mr Clay for a awesome upgrade. 10+ for this one and everything riffraff has to offer. Been buying from them for a long time & never disappointed.

  • 5
    So simple yet so awesome

    Posted by Will on Apr 24th 2023

    Install was easy, idle and overall throttle response has improved noticeably. Very glad I went with this setup. Ford should’ve added these from the factory

  • 5
    FRX. 2002 F350 7.3

    Posted by Kevin on Apr 21st 2023

    It works as promised
    Seams to be well built, time will tell!