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Riffraff Diesel Performance Inc, Engines - Supplies, Equipment & Parts, Eagle Point, OR


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Fuel Rail Crossover™ (FRx)

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Your Price:
$188.81 (You save $8.56)
Part Number:

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

"The Prescription For Your Fuel System Needs®"

We are now shipping our 2nd Generation FRx System that utilizes Eaton Aeroquip® 304 Stainless Steel Braided lines. 

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 will 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.


- FRx System
- 3 Springs for adjusting Fuel Pressure 
- Viton O-ring 
- Parker® Fuel Sleeve
- 2 mounting bolts
- Instructions

Techical Info:
- Exceeds SAE 100R14A
- Rated for commercially produced B100
- Temperature Rated -100˚F to +450˚F
- Max. Working Pressure 3000 psi
- Minimum Burst Pressure 12000 psi

Fuel pressure spring settings 

55-60 psi  silver spring
61-65 psi  gold spring
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.


Product Videos

How To: Riffraff Diesel Fuel Rail Crossover (FRx) (04:01)
How to install the Riffraff Diesel Fuel Rail Crossover (FRx) on your 7.3 powerstroke. Purchase: http://www.riffraffdiesel.com/fuel-rail-crossover-frx/ PDF Instructions: http://www.riffraffdiesel.com/content/RESOURCES/Riffraff_Diesel_FRx_Instructions.pdf
  • How To: Riffra...
    How to install the Riffraff Diesel Fuel Rail Crossover (FRx) o...
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Product Reviews

Showing reviews 1-10 of 134 | Next

  1. PITA!! 5 Star Review

    Posted by on May 16th 2016

    Wow, great product and very well made, but sweet baby Jesus! Was this thing hard to install. From the beginning to the end. Probably by grape ape hands don't help, but the front passenger side fitting is a major PITA to get started. I had no problems removing the test ports. On other thing that was kind of a pain was routing the line to the back end of the drivers side. Truck runs much better and the noise is down quite a bit. So glad I did it, but I should have done it when I rebuilt the fuel bowl so I could attach it outside of the truck.

  2. Great product 5 Star Review

    Posted by on May 4th 2016

    This product does what everyone says. Quieter and better acceleration. Put off installing for about two months. Should have done soner. Getting to plugs was a challenge for me because of car accident in which my hand had to be reattached. Can no longer bend it but The lord blessed me cause I can still us my fingers. Took me about five hours. So I guess I am saying if I can do it so can anyone. Had to use vise grips to remove front plug out. Thanks riffraff for great product

  3. One of the best upgrades 5 Star Review

    Posted by on Apr 20th 2016

    This is one of the best upgrades I've added to my baby. She idles smoother and alot more quiet than before

  4. Improved Driving 5 Star Review

    Posted by on Apr 20th 2016

    I did not notice any quitter idle with my MODS but it does drive smother & has a little less noise while driving. This is insurance to me so I don't have to replace injectors again at 170K.

  5. needed 5 Star Review

    Posted by on Apr 20th 2016

    something that belongs on 7.3 powerstroke,thanks very happy with it

  6. Great for a regulated return while keeping fuel bowl 5 Star Review

    Posted by on Apr 11th 2016

    Great product!

  7. Worth the struggle 5 Star Review

    Posted by on Apr 11th 2016

    I'll start by saying that this upgrade is indeed worth the time and effort, hence the 5 star rating. With that being said, a little advise to future purchasers. Get the 9/32 square socket. Just do it. You'll understand why when installing. Second, I'm glad I was doing an HPOP overhaul as this would have been a pain to install otherwise. Do-able, but a pain. On my set up there is a noticeable difference in cackle (I also installed the high flow banjo bolts). Much quieter, my neighbors thank you. Overall, clean looking install, great results. Great product. Highly recommend to any 7.3L owner

  8. Would recommend to all 7.3 owners 5 Star Review

    Posted by on Mar 30th 2016

    Glad I purchased this, took me almost 3 hours to install, but now that I've done the install. It'll be easier, bolt in the drivers side was a pain to remove but product works great.

  9. Excellent quality 5 Star Review

    Posted by on Mar 29th 2016

    It's hard to say what improved my idle more, the 3 injectors I had to replace (injector cup job) the HPx, or the FRx with higher fuel pressure.

    Either way, riff raff's products are second to none. Installation was simple and straight forward. Great reliability mod for the 7.3!

  10. Improved idle 5 Star Review

    Posted by on Mar 25th 2016

    Excellent product, made a huge improvement in the way it idles and runs, very easy to install products comes with install direction fast and easy.

Showing reviews 1-10 of 134 | Next