7.3L Diesel Fuel Rail Crossover™ (FRx) 99-03 Powerstroke
"The Prescription For Your Fuel System Needs®"
Our 2nd Generation FRx™ System utilizes Eaton Aeroquip® 304 Stainless Steel Braided lines covered with a groundbreaking protective layer of HYTREL® from DuPont.
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 can experience smoother, quieter idle, less cackle, and better throttle response among other things. You will also be increasing your injector life as well by utilizing the FRx™ and creating a regulated return back to the tank. 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.
Included: Techical Info:
- FRx™ System - Exceeds SAE 100R14A
- 3 Springs for adjusting Fuel Pressure - Rated for commercially produced B100
- Viton O-ring - Temperature Rated -100˚F to +450˚F
- Parker® Fuel Sleeve - Max. Working Pressure 3000 psi
- 2 Stainless mounting bolts - Minimum Burst Pressure 12000 psi
- Custom 9/32" socket
Fuel pressure spring settings
55-60 psi silver spring
61-65 psi gold spring *Recommended
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.
386 Reviews Hide Reviews Show Reviews
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So simple yet so awesome
Install was easy, idle and overall throttle response has improved noticeably. Very glad I went with this setup. Ford should’ve added these from the factory
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FRX. 2002 F350 7.3
It works as promised
Seams to be well built, time will tell! -
Great product, better throttle response!
I have a 2002 7.3 F250 with a DP tuner and other common mods. I put these 2 kits on together. My truck has much better throttle response! I did put 3/4” reflective fiberglass protective sleeve (from Oreilly auto parts) on the FPX line on the driver side line as it is close to the exhaust up pipe, I used plastic 1/2” loon to protect the other 3 lines from chaffing. I was able to remove the factory fuel NPT plugs with a small adjustable wrench but a square socket is the best tool of you have it. Make sure all fittings are snugged down. With the gold spring on the FRX regulator. My truck runs smoother, and stronger. I highly recommend these 2 kits!
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Awesome Product!
It quieted down my idle and everything runs so much smoother! Especially on freeway!
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WOW!
What a difference it made. I am going 60+ MPH on the highway and it super quiet. It does not sound like it's struggling any more and its much smoother . It used to sound pretty violent at 70 mph and now its quieter. it feels like i am going a lot slower than 70 mph... best product they offer!
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Frx
Great quality and perfect fit! Riff raff is always top notch
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Excellent product.
This works great. If you experience a surging after install you probably installed a spring with too much pressure (psi rating). I also modified if the slightly so that both feeds were at the front of the heads and the returns came back under the turbo to reduce heat transfer to fuel (might not make any difference at all).
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FRx
Still cannot believe how much smoother and quieter the motor is running after installing the Riffraff FRx fuel rail crossover. The throttle response is an added bonus. This is a must for your 7.3!!!
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Worth it!
Excellent product. Verry happy with results and great price. Riffraff is really innovating these old 7.3 trucks
