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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 61 | Next

  1. 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.

  2. 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

  3. 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.

  4. 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

  5. Perfect Fit

    Posted by John on Dec 2nd 2014

    This is the most economical way to solve the deadhead fuel issue on the 7.3. Works great and fits perfectly. The kit even comes with a new sleeve for the return line. I strongly recommend you get the high flow cvd fitting set to go with this.

  6. Worth the buy!!

    Posted by Hunter on Dec 1st 2014

    I've bought 2 of these to put on mine and my dad's 01 7.3's. I'm running 160/stock FFD injectors and he is running 175/46 Swamps injectors. This is a great compliment mod to the 7.3 fuel system. One unexpected result on my truck is the smoke acceleration from a stop really cleaned up...very happy with that!! Been running mine for a year with no issues.

  7. Another quality Riffraff product

    Posted by Austin on Nov 25th 2014

    Just got around to installing this today and it works great. Install was very straight forward. Before, my fuel p gauge stayed right at 60. Now, with the gold spring it's right on the money reading 67.

  8. Worth the price

    Posted by notjustanyjoe on Nov 25th 2014

    Just installed the FRx and the CVD fittings while doing a fuel bowl rebuild and definitely notice the difference afterwards. I still need to clean my fuel tank screens or do the hutch mod but this helped with a smoother idle and increased throttle response. Definitely Recommend for the 7.3l.

  9. Fixed Long Starting issue

    Posted by Max on Nov 15th 2014

    I was having problems with long starts and narrowed it down to fuel pressure and decided to upgrade instead of just rebuilding the stock regulator on the fuel bowl. Installation was quick and easy and now the trucks starts quicker than it ever has. Really impressed with the service from Riffraff and even happier with their products.

  10. Fuel crossover

    Posted by Unknown on Nov 13th 2014

    Works great and good price

Showing reviews 1-10 of 61 | Next