FRX/fuel question
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Joined: Dec 2012
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From: Las Cruces New Mexico
FRX/fuel question
Everybody with the Riffraff FRX, do your FRX return lines pulsate @ idle? My fuel pressure is at a steady 65-70psi using the spring thats recommended in the kit. Reason I ask is because I've been trying to diagnose a hot rough idle that seems most OBS trucks suffer from but Im no longer running stock OBS fuel system, Im running 99-03 fuel system.
Cargo Master
Joined: Sep 2015
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Everybody with the Riffraff FRX, do your FRX return lines pulsate @ idle? My fuel pressure is at a steady 65-70psi using the spring thats recommended in the kit. Reason I ask is because I've been trying to diagnose a hot rough idle that seems most OBS trucks suffer from but Im no longer running stock OBS fuel system, Im running 99-03 fuel system.
More Turbo
Joined: Apr 2008
Posts: 515
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From: North East Arkansas.
By pulsate @ idle do you mean by vibration or pressure. Mine vibrate to the point that where one line passes under the spider wye connector and makes contact, I had to install wire loom to insulated from said contact. it was wearing a place on the line. And yes mine vibrate and feels like a ticking inside the line. I have never taken a fuel pressure reading on my truck. Does that help?
Because racetruck
Joined: Apr 2007
Posts: 2,786
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From: Monterey Bay, CA
Yes, you can feel the injector firing pulsations through the fuel lines as well as the HPOP lines. It is normal due to the HEUI system, even on the stock metal lines, you just can't see it because they are rigid but that is one reason it wears a hole in the passenger side head metal line from the factory.
Hot rough idle could be a sensor reading like ICP or IPR being a little off. Not likely to be fuel pressure as I have seen extremely high and low fuel pressure and no discernible idle difference.
Hot rough idle could be a sensor reading like ICP or IPR being a little off. Not likely to be fuel pressure as I have seen extremely high and low fuel pressure and no discernible idle difference.
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Greg A R
1999 - 2016 Super Duty
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Feb 3, 2011 03:55 PM
