FRx vs regulated return
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5th Wheeling
Joined: Aug 2018
Posts: 37
Likes: 5
FRx vs regulated return
2002 7.3 F350 zf6 205,000 miles
. I had a 2001 7.3 that I had to replace the motor on because ( according to the diesel shop) it had a weak fuel pump which starved the last cylinder and burnt it up. They said a regulated return system would prevent that from happening in the future.
So now I have a new 7.3 with low miles and I want to do everything I can to make it last. My question is will an easier to install and cheaper FRx system do the same job of preventing a starved cylinder at the end of the head. Or do I need to go with a full on regulated return system. Or will neither of them prevent this sort of catastrophic failure? I welcome your input and opinions.
. I had a 2001 7.3 that I had to replace the motor on because ( according to the diesel shop) it had a weak fuel pump which starved the last cylinder and burnt it up. They said a regulated return system would prevent that from happening in the future.
So now I have a new 7.3 with low miles and I want to do everything I can to make it last. My question is will an easier to install and cheaper FRx system do the same job of preventing a starved cylinder at the end of the head. Or do I need to go with a full on regulated return system. Or will neither of them prevent this sort of catastrophic failure? I welcome your input and opinions.
Lead Driver
Joined: Oct 2005
Posts: 6,129
Likes: 1,919
From: Ponca City, OK
Google ”can diesel engines be damaged by running lean” then find a new ”shop”, or better yet hang around here long enough and become your own mechanic. Remember ”fear is the mind killer”. Sorry had to do it, seriously how often do you get to bust out a Dune quote. To answer your question, loads of folks here are running the frx and I'm pretty sure most are more than happy with the results. I went diy regulated return with an in tank pump and am pleased with it's performance. Hard to suck air when the pump is swimming in diesel. So truthfully I don't think you could go wrong either way. Good luck and keep us posted.
Super Moderator
Joined: Dec 2011
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I don't even know what "Dune" is, but that quote... "Fear is the mind killer", is now forever in my lexicon.
@94-97-01
Make up your mind will ya?
You don't have a 94, a 97, nor an 01.
You have a 2003! The last year of the 7.3!
For the last 22 years, my truck has had the bone stock fuel system.
No FRX. No ITP. No HPX. No XYZ. No LL. No HH. No RR. No BS.
And no problems with Cylinder 8.
YMMV, but IMHO, you don't need to do anything, and I suspect your previous mechanic is fanning flames of fear that he genuinely believes in.
@94-97-01
Make up your mind will ya?
You don't have a 94, a 97, nor an 01.
You have a 2003! The last year of the 7.3!
For the last 22 years, my truck has had the bone stock fuel system.
No FRX. No ITP. No HPX. No XYZ. No LL. No HH. No RR. No BS.
And no problems with Cylinder 8.
YMMV, but IMHO, you don't need to do anything, and I suspect your previous mechanic is fanning flames of fear that he genuinely believes in.
Laughing Gas
Joined: Mar 2021
Posts: 1,118
Likes: 425
The logic of this doesn't make sense; if a weak fuel pump was the cause how would a regulated return help? Regardless, think of this: why didn't the last cylinder on the other head suffer a similar fate?
Lead Driver
Joined: Oct 2005
Posts: 6,129
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From: Ponca City, OK
Dune is what Star Wars would have been if it were written by Stephen King. Frank Herbert, one dude's brain I might legitimately be afraid to take a stroll in. Now that I think of it, Stephen King probably makes that list too.
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Lead Driver
Joined: Oct 2005
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From: Ponca City, OK
That poor poor truck. It never gets to go out and play. I'm just picturing bunches of sad puppy dog eyes while that Sarah McLachlan song plays in the background.
Cargo Master
Joined: Sep 2015
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LMAO!!! In the arms of the angels 🎶
Trailering
Joined: Dec 2021
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From: Utah
Love me some sai King. May have to look into this book.
Last edited by Ford_Rush; Mar 29, 2022 at 12:23 PM. Reason: add quote
Cargo Master
Joined: Mar 2019
Posts: 2,907
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From: Kinnula,Finland
I started with 470k and after 3.5 years i'm in 525k.
I've done "some" mods too..
Edit
I have zero fuel mods.(broken pickup is waiting in the tank)
I've done "some" mods too..
Edit
I have zero fuel mods.(broken pickup is waiting in the tank)
FTE Leadership Emeritus
Joined: May 2014
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From: Lake Hartwell, GA
I don't have or intend to get an FRx or regulated return, but I see no problems with someone else who wants to run either on their vehicle.
Been running H/H mods for years and a lot of cross country miles towing heavy. I am grateful for the added fuel capacity, quieter idle and non-puking fill neck.
To each their own.
As for Dune... I thought the new version was a great start to the story. I think the Star Wars comparison above was accurate.
Been running H/H mods for years and a lot of cross country miles towing heavy. I am grateful for the added fuel capacity, quieter idle and non-puking fill neck.
To each their own.
As for Dune... I thought the new version was a great start to the story. I think the Star Wars comparison above was accurate.
Laughing Gas
Joined: Mar 2021
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That was definitely a comparison I heard floating around the theatre when I saw it; "this must have been what it was like to see Star Wars when it came out".
FTE Chapter Leader
Joined: Jan 2005
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From: Henderson, NV
The new Dune movie perhaps. The old Dune movie where the Harkonnens had drain plugs on their chests was super campy.