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.
399 Reviews Hide Reviews Show Reviews
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fun project
worth the time to remove the spyder and other components in the way, I did the HPX and banjo bolts at the same time. fits well!
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Fuel rail crossover - very nice
I've got like 290K on my 1999 F350. I had to redo the seals on my HP oil pump and found this and the fuel system cross over.
I cleaned up the IPR valve and noted that the engine was a bit quieter, and noted that the oil cross over and the fuel cross over would make the engine quieter still.
I did the cross over and fuel cross over separately to see what the differences were. (I have a separate review for the oil crossover.)
The fuel cross over was pretty easy to do after understanding how much torque I needed torque in the fittings for the oil crossover. I'd also previously remove the fuel bowl when getting into the HPOP so loosening the fuel bowl was another easy step..
I used a 7MM open ended wrench to remove the plugs. Since I have a 99, I also ground the exhaust pipe a bit for the installation of the read driver side fuel port, but in hind sight i'm not sure I really needed to do that.
At idle, i'm not sure I can tell this is more quiet then what the oil cross over does. But at speed, the engine is noticeably quieter. My wife also noticed that as well. I installed the gold spring as all I have is a moderate 50 HP chip. And unlike the oil cross-over by itself, the throttle response also seems more responsive. Don't have enough miles to determine if the fuel mileages is better yet.
If you are going to do this, i'd recommenced doing this with the Oil cross over as well.
Very pleased with the engine behavior as well the fit and finish of the product - pretty happy so far.
Next mod is the AFE air cleaner. -
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.
