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.
409 Reviews Hide Reviews Show Reviews
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Great product
Fit and does just what is says. Awesome. Really great product
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3 mpg improvement
I did a lot of work on my 99 7.3 314,000 was getting 9-10 mpg I did fuel lines frx fuel bowl rebuild cvd high flow bolts I probably forgot something I did. hutch mod and torpedo mod. I do have a question on my fpr I used black spring but poppet seat was bad so I used o ring supplied with frx ( its labled check valve oring near the bottom of the oring list oring number 8 ) . well that was bugging me so I ordered new poppet that came with the new seat so I called clay he said use new poppet and o ring #8 so I did 95 psi is what i'm getting so I took it out back to 58 lbs of pressure im going to do it again see what happens. I know I know its the weekend I cant get anyone on the phone to help maybe I bent spring. but overall I really did increase my mileage by 3 mpg.
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A must have
One of the best things i have done for my 7.3, way smoother idle, put the suggested 60lb spring in, could'nt be happier about this product! Easy install and looks factory! Thanks Riff Raff, you guys are the best!
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Great product
My engine starts quicker than ever before. I installed this fuel system and made a trip pulling a trailer at 75 to 80 mph from Altus Ok to Waynoka Ok and got 14 mpg. A definite improvement over the stock system. The engine also seems more quiet at highway speeds. I will perform more mpg test in the near future and respond soon.
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Great product
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.
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A MUST DO UPGRADE FOR YOUR 7.3
A VERY WELL MADE PRODUCT, INSTALL IS A LITTLE TRICKY, BUT 100% WORTH THE EFFORT.VERY GOOD INSTRUCTIONS,AND I CAN TELL MY INJECTORS ARE HAPPY NOW..
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prefect fit
Was having fuel pressure spike issues.... after installing this FRx its steady 65 psi.... Everything fit the way its supposed to with out modifications!!!!
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Really quietens the 7.3
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. -
FRx
Excellent product. Did exactly what was described on your site. Truck runs great and sounds a lot smoother.
