Fuel Rail Crossover™ (FRx)

Part Number:
FRx

Manufacturer:

$209.13
$209.13
$193.88
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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.

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1999-2003 7.3L Powerstroke with stock fuel bowl
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306 Reviews Hide Reviews Show Reviews

  • 5
    Very happy

    Posted by Andrew Reyes on Feb 22nd 2021

    I have a 99 f350 4x4 7.3. I am very happy with the modifications I have done so far. The engine does 10 more miles per hour up a 5% grade from 52 mph to 60 mph pulling three horse trailer. Mpg is up 2., from 9.5 to 11.5, Clay knows this motor. Looking forward to maintaining this motor with riffraff up grades.

  • 5
    Exactly what I was expecting

    Posted by Jeff Osborne on Feb 19th 2021

    Installed and doing the job

  • 5
    Regulated Return Lines

    Posted by Sam Hudson on Feb 13th 2021

    Clean install, quality system and way less expensive than anything else on the market. Maintaining 64psi now and the idle and startup are smooth and fast.

  • 5
    FUEL RAIL PRESSURE

    Posted by RICHARD STEWART on Jan 4th 2021

    THE PRESSURE WAS TESTED BEFORE WE INSTALLED THE FUEL CROSS OVER AND OUR PRESSURE PEGGED OUT OVER 100. AFTER INSTALLING THE CROSS OVER THE PRESSURE DROPPED TO THE PRESSURE IT WAS SUPPOSE TO BE WHICH WAS BETWEEN 65 TO 70 LBS OF FUEL PRESSURE. AWESOME FIX FOR OUR DIESEL 7.3. THANKS,

  • 5
    Does the job

    Posted by Jeremy Brooks on Dec 21st 2020

    I installed this item when replacing the busted factory regulator. The engine is a little smoother running and definitely quieter. I don't feel anymore major power drop when pulling in the higher RPM range - I presume this is helping. I noticed nothing in the way of throttle response or any other power/performance change - But, that's not the point. It's a pain to install the fitting on the driver side.

  • 5
    Quality

    Posted by Juan villalobos on Dec 9th 2020

    Easy instal. Great quality pice and well thought out design makes it way smoother

  • 4
    FRX

    Posted by David Willson on Nov 30th 2020

    I was impressed when I looked this thing over. It's specifically designed and the quality of all the parts is top notch. I really think it's 4.5 stars; the only negative is it's a bitch to install, takes a special tool to get out the existing plugs and that's not included, and the directions aren't clear on the best routing for the hoses. We got it all in but finding a place to ziptie the hoses so they don't rub is tough. Perhaps if the hoses were a few inches longer, they could be routed along existing wiring or tubing. But even with that tiny negative, this a beautifully made crossover and I immediately noticed that the motor's quieter. My truck: 2000 7.3, stock except for a Hydra chip.

  • 5
    FRX return

    Posted by Corey Schaefer on Nov 25th 2020

    I was doing all sorts of work on my truck. Replaced a cracked head to be specific. While under the hood decided to do all I could as preventative maintenance and small upgrades. Install of the FRX was easy with all top end components removed. First thing my friend said after he saw it running was “Is it quieter “!
    No joke. Was hard for me to tell with all the other stuff I was more concerned about but his comment was great to hear. He didn’t even know I had done it!

  • 5
    Yes

    Posted by Michael on Nov 13th 2020

    Install was a bit tricky. It fits very well. Did this with the hpx line.
    The hard part was getting the rear hose attached. It's difficult with only fitting one hand. But I didn't take off the intake hose.
    I noticed that my egts are slightly lower under hard acceleration. And the engine runs much smoother. It feels more balanced. It's also noticeably quieter. The cackling is still there. But I'd guess 20-25% less cackle. All in all I'm very pleased. And have recommended this to several people. Thanks again riffraff.