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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 81 | Next

  1. Great product 5 Star Review

    Posted by on Apr 21st 2015

    I can not say that this product did anything by itself. I did numerous upgrades at one time. I replaced my up-pipes, Riffraff CVD, FRX and Fullforce stage 1 injectors. I was completely impressed!!!!!! I love my old E99 all over again.

  2. A MUST DO UPGRADE FOR YOUR 7.3 5 Star Review

    Posted by on Apr 14th 2015


  3. prefect fit 5 Star Review

    Posted by on Apr 13th 2015

    Was having fuel pressure spike issues.... after installing this FRx its steady 65 psi.... Everything fit the way its supposed to with out modifications!!!!

  4. Really quietens the 7.3 5 Star Review

    Posted by on Apr 13th 2015

    I replaced my 1st generation FRx with the 2nd generation. I had a leak on my fuel bowl and thought it would be a good time to install the Gen 2. I did the change with the fuel bowl off of the engine.

    Putting the fuel bowl back was a little more difficult with the Gen 2 FRx. The hoses route better and are a better quality. However, the way they route on the Gen 2 makes access to the fuel input connection tricky.

    It connected right up to the head connectors from the Gen 1, so that was easy.

    Great service as always.

  5. FRx 5 Star Review

    Posted by on Apr 6th 2015

    Excellent product. Did exactly what was described on your site. Truck runs great and sounds a lot smoother.

  6. I recommend every 7 3 driver to buy this 5 Star Review

    Posted by on Apr 2nd 2015

    This is the hands down best thing you can do for your truck, stock or modded, everyone needs this! easy install, more horse power. important note is to loosin the bolt for hpop, you cant install it with out doing that

  7. Great product! 5 Star Review

    Posted by on Apr 2nd 2015

    Between this and the HPX my truck runs a lot better and is much quieter. Fuel mileage seems to have gone up also. I highly recommend this product. Don't forget the square socket to remove the plugs.

  8. Great product 5 Star Review

    Posted by on Apr 1st 2015

    Good instructions, easy install after you get test plugs out. Ran smoother, noticible jump in fuel economy (used gold spring as recomended). The overhead info center showed a 2+ mpg increase on a few of my regular routes.

  9. FRx CVD Banjo Project 5 Star Review

    Posted by on Apr 1st 2015

    I updated all at once. CVD's and FRx were a bit of a challenge due to the placement on the engine and under the cowl. Special socket didn't work because of my 3/8 rachet head. You need a 3/8 breaker and it may work. I ended up using Vise Grips. In an earlier post someone mentioned to use a #7 end wrench.

    Overall with the HPx I installed earlier. I have a much quieter, smoother, and better performing engine. I'm getting better mileage too.

    I'm glad I installed these products.

  10. FRx 5 Star Review

    Posted by on Mar 24th 2015

    Installed the fuel rail crossover and fuel tank sump; now my dually is like it has a new 7.3!

Showing reviews 1-10 of 81 | Next