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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 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.


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Product Reviews

Showing reviews 1-10 of 67 | Next

  1. Best product.

    Posted by Unknown on Feb 26th 2015

    I installed it on my 7.3 superduty. It was okay to install found it was easy to remove the ac compressor and move it over to get the plug easier. I love the throttle response now. The only thing i wish is the the block and where the lines that come out were angle down move so it looked move factory.

  2. good quality

    Posted by Ivan on Feb 25th 2015

    installed on my 2000 f250, it was tougher than I expected but everything works like they said it would

  3. Great product, tight fit

    Posted by Jarod Marks on Feb 23rd 2015

    Installed on an e350 prior to motor going back in. Tight fit.

  4. Great design, well built & complete!

    Posted by Unknown on Feb 12th 2015

    Installed the Fuel Rail Crossover™ (FRx) on my 01 F250 Superduty to balance fuel return between the injectors and to reduce dead heading plus to quiet down some injector clatter. Didn't notice much difference initially in sound but when i was cruising at freeway speeds I could feel the difference in response and a smoother, quieter power delivery.
    Installation was a bit cramped, plan your hose routing especially for the left bank. I removed the ac compressor with out disconnecting hoses on the right side, plenty of room with the compressor moved slightly over.

  5. Well built and easy install

    Posted by Ricky300m on Feb 11th 2015

    This parts made a HUGE difference in the way my rig runs, starts, and accelerates!

    Like instructions say, beware not loose the spring, also the nut on the of fuel Lin coming into the fuel bowl can slip down the tube and end up out of reach!! I spent 30 minutes trying to get it back up the line. Wrap black tape in the line behind it so it doesn't go down the fuel line

  6. Hope to get installed soon

    Posted by Chad on Feb 3rd 2015

    I am piecing together some things to do while the turbo is off to do pedestal O-rings. Very well built part as soon as its on truck and I get to run it for awhile I will repost another review with the results.

  7. awsome product hated the install though..

    Posted by Unknown on Jan 4th 2015

    All on all the FRX is great!! Much faster startup and better fuel pressure. The install sucked being that its 28 degrees out and I have an e99 so I had to grind down the up pipe ( verry tedious) but none of that is riffraffs fault. In the end verry happy with this product.

  8. good fit

    Posted by Unknown on Dec 25th 2014

    only gripe is should have a 45 deg fitting for rear head, to get the line away from the up pipe to the turbo, super close.
    remedy wrapped with header wrap to keep the heat off the fitting

    perfect fit

  9. good product

    Posted by Unknown on Dec 18th 2014

    Runs alot quieter and smoother.only way it could be better is if 90s were not made on hoses,but the fitting were 90 and hoses had straight fittings.

  10. Highly Recommended

    Posted by Matt - Lincoln, NE on Dec 11th 2014

    I installed this on my 2003 7.3 to help prolong the life of my injectors. It quieted down the dead head tick that I could not stand on long road trips. I have only had it on for a few weeks. So far I love this product. It will be a perfect match for stage 1 injectors as opposed to a full regulated return system.

    I highly recommend the square plug socket when purchasing this product. Install only took about 1.5 hours and I installed the CVD high flow fittings at the same time, along with a new wastegate actuator.

    Thanks Clay

Showing reviews 1-10 of 67 | Next