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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 40 | Next

  1. 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!!

  2. 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!

  3. 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.

  4. 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

  5. Great product, Great people

    Posted by Unknown on Jun 28th 2014

    "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."

    This alone is a good reason to buy this, support American workers, and it makes your truck run better in the process!! win win.

  6. Best Mod ever for the7.3

    Posted by tugnutt on Jun 27th 2014

    After installed took it on test run and what a diff. in throttle response. If this also gives the injectors longer life then duh well worth the cash. My 01 has AC so it was easier to unbolt the unit shift it over & install the NPT to the pass. side head...Seems a bit quieter then before..Look forward to loading my camper & going over the pass with plenty of power to spare.

  7. perfect

    Posted by pj on Jun 26th 2014

    No more bogging down of the engine. Smoother idle. Much more quiet, engine has more pick up and idles at a slower rpm. I'm extremely happy with it. I don't think my truck has run so smooth since it came off the line

  8. FRX does what it claims to

    Posted by 12745 on Jun 24th 2014

    The product quieted my 7.3, and I have better pedal response. One of the few products that does what it claims to do. Worth every penny I paid for it. Tight on the install but worth it.

  9. A perfect fit, "USA Made" product

    Posted by ACC on Jun 19th 2014

    Besides a larger exhaust, this is the first mod done to my '02. I decided to install this return system "while I was in there" performing a complete reseal of the oil and fuel systems. It went right in as it should, and the hoses were "clocked" correctly to land on the head fittings perfectly. The recommended middle spring was installed in the regulator. After install, I noticed one thing right away .... quicker starts, especially cold start. It also seems to have a smoother, idle to off idle manner.

  10. Excellent product

    Posted by Eric on Jun 12th 2014

    As usual riffraff came through. Well built product with nice heavy duty hoses. I installed while changing the injectors so I already had most parts out of the way but I would think it would have been an easy install anyway. Between the Hpx, Frx and new injectors from riffraff the truck has never ran better.

Showing reviews 1-10 of 40 | Next