high ipr %
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Lead Driver
Joined: Sep 2010
Posts: 7,793
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That's my question...if its a deadhead system and fuel is regulated at the bowl, how is oil contaminated fuel getting back into the filter and being returned? Mind you, my filter is honey brown like it is new outta the box
Hotshot
Joined: Jan 2011
Posts: 18,849
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From: Puget Sound
ICP is 500 PSI at idle. Fuel pressure is 60-70 PSI at idle. Guess where that oil goes if the O-ring between the fuel and oil part of the injector is compromised. Now... if the top O-ring is compromised, then it bleeds up into the top of the head and just returns to the pan. While this has no ill effect on any fluids in the truck, it wreaks havoc with yout ICP/IPR numbers.
Lead Driver
Joined: Jun 2007
Posts: 7,760
Likes: 27
From: Hampton, Maryland.
Mine never turned black. I couldn't build enough ICP to start once the oil warmed up. Luckily at the time my external O-ring problems occurred, it was extremely cold here, so i could start in the am and get where I needed to go, if i shut the truck down, it wouldn't start again until the oil cooled and thickened up, which usually took about 60-90 minutes when it first happened. If I kept the truck running though, it ran and drove like normal, even with normal operating temp oil.
Lead Driver
Joined: Apr 2016
Posts: 7,182
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From: Bahstun
its not a dead headed fuel or HPOP system, fuel return on bowl after regulator, injectors return oil in via the spout
loose injector can cause the top oring to wear and cause a leak into valve cover area
Lead Driver
Joined: Jun 2004
Posts: 6,317
Likes: 583
From: Amarillo, TEXAS!
The fuel system, at least as far as the heads go, is as close to a deadheaded system as it can get. The check valve fittings at the fuel feeds to the heads are vented, however. Any air pockets trapped in the fuel galleries will expand when the fuel pump shuts off, pushing fuel back out of the heads through the check valve vents and into the filter housing.
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Lead Driver
Joined: Sep 2010
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If time allows, Chet.. Will take a stab at it this weekend. Hitn mammoth again next weekend...
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Hotshot
Joined: Jan 2011
Posts: 18,849
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From: Puget Sound
A loose injector can allow combustion pressures and gasses to reach the injector cup - a surface never meant for that kind of torture. This is one of the key causes of injector cup failure.
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Lead Driver
Joined: Sep 2010
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I have installed, a capped jic fitting where a hpx would be installed. With vc's off, I'm gunna pressurize that fitting.
. 2 questions...
....will I need another fitting on ds side
....do I have to do anything with the hpop lines
. 2 questions...
....will I need another fitting on ds side
....do I have to do anything with the hpop lines
Lead Driver
Joined: Jun 2007
Posts: 7,760
Likes: 27
From: Hampton, Maryland.
It should pressurize the whole system if I recall correctly. Make sure that you use a rag around the tip of the air gun because it will almost atomize some oil when you pull it off. It will make a mess, believe me.
Lead Driver
Joined: Jun 2007
Posts: 7,760
Likes: 27
From: Hampton, Maryland.
Check this old thread from when I was doing the Cody test. There is a lot of good information there and of course Cody was participating so it's very good stuff. Should be around page 4 or 5 when things get interesting.
https://www.ford-trucks.com/forums/1...tuation-5.html
https://www.ford-trucks.com/forums/1...tuation-5.html
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