Loading... Please wait...


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


  Our Newsletter

Fuel Rail Crossover™ (FRx)

  • Image 1
  • Image 2
Part Number:

Product Description

"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.

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.


Write your own product review

Product Reviews

Showing reviews 1-10 of 92 | Next

  1. Little bit quieter idle 5 Star Review

    Posted by on May 23rd 2015

    Truck now idles a little smoother without as much of a knocking cracking sound coming from the engine.

  2. Well worth the money 5 Star Review

    Posted by on May 18th 2015

    I did this mod along with the FRx and it made a big difference in the running of my engine. It is much quieter and runs smoother. I would recommend this to anyone that has the 7.3 engine.

  3. does what it's supposed to do 4 Star Review

    Posted by on May 17th 2015

    I always had satisfactory fuel pressure, but always had a fuel knock too.
    installed item and had the same pressure but alot quieter smooth running engine.
    Now I was losing pressure under hard load,10psi. So I did the "hutch" mod and it's working great!

  4. FRx ! 5 Star Review

    Posted by on May 13th 2015

    Awesome upgrade! A must have. Easy install, great quality.

  5. smooth 5 Star Review

    Posted by on May 11th 2015

    It was almost unveil able how much smoother my truck now idles and quieted the truck down a bit too. awesome product and easy install.

  6. '03 7.3 5 Star Review

    Posted by on May 6th 2015

    Along w/Full Force AD's, my truck never idled so smooth and quiet, feels peppier, next weekend pullin' the 5er will tell for sure. Easy install, quality all the way. Same performance as Reg. Return at a fraction of the cost. (I can't see the gauge while driving, anyway)

  7. great product 5 Star Review

    Posted by on May 5th 2015

    Great product as usual it really help calm the motor down. If you have a 7.3 this is a must thanks for another great product.

  8. Great product 5 Star Review

    Posted by on May 4th 2015

    Fit and does just what is says. Awesome. Really great product

  9. 3 mpg improvement 5 Star Review

    Posted by on May 2nd 2015

    I did a lot of work on my 99 7.3 314,000 was getting 9-10 mpg I did fuel lines frx fuel bowl rebuild cvd high flow bolts I probably forgot something I did. hutch mod and torpedo mod. I do have a question on my fpr I used black spring but poppet seat was bad so I used o ring supplied with frx ( its labled check valve oring near the bottom of the oring list oring number 8 ) . well that was bugging me so I ordered new poppet that came with the new seat so I called clay he said use new poppet and o ring #8 so I did 95 psi is what i'm getting so I took it out back to 58 lbs of pressure im going to do it again see what happens. I know I know its the weekend I cant get anyone on the phone to help maybe I bent spring. but overall I really did increase my mileage by 3 mpg.

  10. A must have 5 Star Review

    Posted by on Apr 28th 2015

    One of the best things i have done for my 7.3, way smoother idle, put the suggested 60lb spring in, could'nt be happier about this product! Easy install and looks factory! Thanks Riff Raff, you guys are the best!

Showing reviews 1-10 of 92 | Next