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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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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 46 | Next

  1. Great Throttle response

    Posted by Idaho Country Boy on Sep 16th 2014

    I have an early 99, that made this a royal pain to install, trying to get the back fitting to fit properly wasn't fun but other than that I would definitely recommend to friends and family. Great throttle response and just a tad quieter

  2. very nice!

    Posted by Unknown on Sep 12th 2014

    easy install, very good quality!

  3. Kill the cackle

    Posted by Images by TLP imagesbytlp.com on Sep 7th 2014

    I was looking to rid my 7.3 of the cackle I was here at highway cruse. Sounded awful, this kit was an easy install and did just what was expected and what I wanted. Not looking to build big power from this truck just tidy up, smooth it out and pick up MPGs where possible. This a great first step in this regard. So far so good, as a race car mechanic I'd say the quality is as good as one could hope to see in a production part. The fittings don't swivel but the are indexed so it all good. tip: the square head plugs in the head a 7mm and can be broke loose with an open ended 7, at least in my case. This is much better than the suggestion in the instructions.

  4. well made

    Posted by Unknown on Sep 7th 2014

    Would suggest Riff Raff sell an elbow so don't have to grind on collector for early 99. Then I would give it a 5 star. It is well made and should help injectors last longer.

  5. Injector insurance

    Posted by Unknown on Sep 2nd 2014

    Piece of mind with new injectors to keep the air out of them. hardest part for me on the install was getting the inside bolt on, even with the fuel bowl unbolted it was a real pain in the butt to get that bolt in with one of the fuel lines in my way.

  6. This is by far one of the best mods you can do

    Posted by Unknown on Sep 2nd 2014

    I never though my truck could start as smooth as it does now . It was a little bit of a pain to put on but we'll worth it my throttle response is better and the truck just sounds like a new truck . I recmoned going the in tank mod along with it .

  7. Worth the time and money!!

    Posted by Rickey on Aug 15th 2014

    The hardest part was I had to unbolt the a/c to get the new fitting inplace of the plug. Other then that, directions are pretty straight forward. Noticeably quicker starts and smoother idle. Slightly quieter as well. Plus it helps prolong your injectors and it's a great, quality product made right here in the USA!!

  8. Great once fitted

    Posted by Garry on Aug 14th 2014

    Do it!
    The only issue with the whole package was removing the plug on the drivers side front plug (Aussie model) so I removed the AC and the mounting bracket and that made it a 10 min job.
    Make sure you order the 9/32 socket as this will prevent rounding off the square plug.
    Smoother, quieter and more responsive.
    Do it!

  9. Installation a challenge

    Posted by Larry Proctor on Aug 4th 2014

    Have a early 99 and it was a challenge to install. The instructions are good and the main reason for success. Fat fingers and getting the tool needed to grind the manifold was the hardest. The result is a quicker response engine and no ticking like I have a valve knocking. It still rattles like a diesel, but that is ok.

  10. Good injector insurance

    Posted by Unknown on Jul 15th 2014

    Great product, made a bit of a difference in idle and acceleration seems smoother. Nice to get the air out before it goes through the injectors.

    Thank you riffraff

Showing reviews 1-10 of 46 | Next