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.
416 Reviews Hide Reviews Show Reviews
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Fuel upgrade
This product was amazing . Quality of product incredible . I have a 2001 excursion and am amazed that ford didn't install this at factory. But thanks Riff Raff for the quality product fast shipment . I tackled this in a day . Took my time no leaks and the truck runs quieter and faster in my opinion. I also purchased banjo bolts,Hpx and increased flow fuel line fittings. Thank you so much
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Best regulated system out there!
I had a Strictly Diesel regulated return on my last 7.3L and it worked well. I just put an FRx on my new 02' and while it work just as well, it is so much cleaner to install. Great machine work, and the lines look very quality stainless braided with a nice cover on them. Home run for Riffraff, I recommend this system hands down.
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We'll worth the money
Definitely makes a big difference in the way the engine sounds and runs. Lower EGT as well. Every 7.3 should have had this from the factory.
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I feel the difference
It made quite a bit of a difference, engine is a lot more quiet, I did the FRx,the High Flow Fuel CVD Fitting Set and the Stainless Steel HPX and removed the needle in the fuel bowl all at the same time and I can A difference in power and fuel economy.
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Smoother for sure.
Did the oil crossover and cvd fittings too along with frx line and ww2, and 6pos chip. chip came without program so total results are still out, but definitely better than stock.
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Good quality
Good quality but wish it would have came with detailed instructions. Challenging to get the fittings started in the heads.
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2001 Ford f350
Extremely easy to install. I didn't have to move the fuel bowl, I just moved the fuel line out of the way and it went on with ease.
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Early 1999
Was very easy and strait forward to install, plug on driver side head was easy mainly because I had turbo and Y pipe out to be replaced with new at same time. I noticed quieter injectors, and quicker throttle response. I'm not sure if the fuel springs make much of a difference, but I used the GOld spring.
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Runs Quieter
Easy to install and is a lot quieter in the cab. Great product. Don't forget the new o-rings to replace the stock ones.
