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.
415 Reviews Hide Reviews Show Reviews
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FRX Return
Does exactly what all the reviews say, smoother idle, faster starts and almost 1 mpg more after install, hand calculated. Install was straight forward, but I would strongly recommend getting the 9/32 socket they offer. It makes getting the plugs out of the head a breeze. I am not sure how I could have done it otherwise. Overall 10/10, and it has exceeded my expectations on quality.
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Fuel Rail x-0ver
Perfect length and angles.
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Shouldn't have waited
Great product. notice a difference right after installing
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Fuel crossover
Fits and works nicely
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Crossover
Installed while doing cups and injectors. I feel no performance gain but it did take away a bit of injector noise. Excellent customer service beginning to end!
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Get the swear jar ready
Product is great no issues there. The location of the plug on the 7.3 is a PITA. Make sure to put a rag under the area at front plug in case you drop something it won’t go far. Otherwise great upgrade. But again will likely have to return to Stock due to the great state of taxing my taxes with extra taxes and fees and smog checks on vehicles never made to be smog checked.
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Right Part, Right Price
They are right, this is just the prescription for the fuel system issues on your power stroke. While everyone else is trying to sell you on deleting your fuel bowl and paying $600 for a return system Riffraff engineers a perfect drop in system. This is how it should have from from the factory. Good job on a great product.
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Fuel Rail Crossover FRX
The FRX did exactly what it claims. Installed this on my 99 7.3 dually, all stock and no tunes. It runs noticeably smoother and bit quieter, and acceleration has a slightly improved. I'm very happy with this and would recommend
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Worth Every Penny
Does what everybody says it does. Idle is much smoother and acceleration is much more linear. Overall engine perceived noise is cut by half in my calibrated ear, ha! Seriously, noise is way down and number 8 injector banging is gone completely. even on a cold start. I did install the HPX and the brass poppet valve, seal and seat from the relief valve rebuild kit during the same mod-fest so it's hard to know what improved what but overall I'm very happy with this outcome. Well worth the time and effort. I will add a couple of tips. Order a spare FRx Replacement JIC/NPT Adapter with the FRx. Cheap insurance that won't pay for overnight shipping when you drop the rear one behind the engine like I did. And order the Fuel Pressure Relief Rebuild Kit. You'll want it when you see the worn out OEM plastic piece of crap poppet valve.
