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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:
$179.00 (You save $18.37)
Part Number:

Product Description

"The Prescription For Your Fuel System Needs®"

We are now shipping our 2nd Generation FRx System that utilizes Parker® 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
- 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.

Installation Instructions Click Here 

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Product Reviews

Showing reviews 1-10 of 21 | Next

  1. great bolt-on upgrade for the 7.3L

    Posted by chris w. britt on Apr 13th 2014

    we have been working hard to restore our 7.3L and make it an MPG monster. with all of our add-ons and improvements, we were getting close to 20mpg city and 30mpg hwy. with the addition of the FRX and HPX (should do both) now we are close to 21 mpg city and 33 hwy. the truck runs better than ever and drives better than ever. throttle response is like that of our new 6.7L. our Excursion has over 130k miles, and drives better than it did on day 1 now. one tip...BUY THE 5/16 square pipe plug socket. we did not, and wasted way too much time figuring how to get those darn things off. riffraff has a great thing going in offering you the tool, so follow their lead. also great shipping and great customer service. thanks riffraff!

  2. great product

    Posted by Unknown on Apr 6th 2014

    Great product nice quality i would recomend this mod to anyone be sure to order the socket to take out the plugs it makes life so much easier

  3. Definitely worth the money!!

    Posted by zach on Apr 4th 2014

    The kit was easy to install. Professional kit here hardest part of install for me was the pipe plugs. It's worth it to buy the 5/16" socket that is listed on the page I didn't and couldn't find anything close locally. So I end up buyin a easy out set and just used it after I rounded the plug a little. But the socket they have on the Web site and get a good penetrating oil and just keep spraying it a couple days before. Other than that kit is easy and simple to install.

  4. Nice Product

    Posted by Haggs on Mar 31st 2014

    Easy to install with the help of the 516FP socket sold here. Quality product made for years of service

  5. Incredible mod!!

    Posted by McGixxer on Mar 29th 2014

    After 200,000 miles of driving my truck I decided to make some mods to my truck. The Riffraff FRx is one of the best things Ive ever done to my truck! I did it along with the Riffraff HPx. My truck is incredibly smoother now.

  6. well made product

    Posted by rich on Mar 24th 2014

    Product is very well-made. Installation instructions are good, but it is definitely a must that you remove the fuel bowl during installation. When doing that you will need the new O-rings for the fuel lines.

  7. A Quiet 7.3

    Posted by Drew on Mar 23rd 2014

    Hard to imagine how much quieter my 7.3 runs with this Crossover. Should have done this long ago

  8. great price great product

    Posted by Unknown on Mar 18th 2014

    Installed with HPX, helped start easier,smoothed and quieted idle a little. Very fast shipping top notch products.

  9. Good Product for the $$$

    Posted by Unknown on Mar 17th 2014

    Does the same thing the more expensive systems do for much less money. Definitely quieted and smoothed my truck a bit.

  10. Smoother idle

    Posted by Unknown on Mar 13th 2014

    Heard a lot about this frx. All I got to say is it works good. Put the middle spring in and changed to a terminator 180 thermostat, gained hand calculated 2 mpg! I'd have done it sooner if I had known! Only reason I documented mileage is because I fill at my home tank driving same route, same speed, same distance. Egt runs 625 range cruising, before it ran 660 range.

Showing reviews 1-10 of 21 | Next