HX Crossover Mod
Post Fiend
Joined: Feb 2007
Posts: 7,191
Likes: 4
From: Blairsville,Ga
Originally Posted by PaysonPSD
Would shortening the return line have the same effect? I have never heard that mentioned. Would it have an adverse effect? Does the return line have to be immersed in the fuel? 
all the older diesels just had a short tube for return
Posting Guru
Joined: Aug 2007
Posts: 1,852
Likes: 1
From: Sonoita Hills, AZ
Originally Posted by Kwikkordead
If you miss this step all your work will be for nothing. That goes for all the quick connects between the fuel tank and the fuel pump inlet. The fuel return does not need to be messed with, nor does anything between the fuel pump and the engine. Just the plumbing between the fuel tank and the fuel pump inlet. The air gets into the fuel stream via those quick connects because that part of the system is under a partial vacuum and it gets sucked in there. Get rid of them and use FI rated fuel hose with two hose clamps per end. If there is not enough room for two, no big deal. I simply like the redundancy for the best seal.
Posting Guru
Joined: Aug 2007
Posts: 1,852
Likes: 1
From: Sonoita Hills, AZ
Originally Posted by PaysonPSD
Patrick-
The fitting right before the fuel pump should be removed because they will at times suck air into the fuel system. The whole reason for this MOD is to keep air out of the fuel system. My .02 cents
The fitting right before the fuel pump should be removed because they will at times suck air into the fuel system. The whole reason for this MOD is to keep air out of the fuel system. My .02 cents
Post Fiend
Joined: Nov 2007
Posts: 9,549
Likes: 14
From: Payson, AZ
Ray,
Thanks for the input.
I was thinking why lengthen the return line when you could just shorten it. Let it return way above the pickup and the air would rise, not sink. I'm sure the older diesels didn't have a problem when the fuel level dropped below the end of the return line.
Thanks for the input.
I was thinking why lengthen the return line when you could just shorten it. Let it return way above the pickup and the air would rise, not sink. I'm sure the older diesels didn't have a problem when the fuel level dropped below the end of the return line.
Last edited by PaysonPSD; Jan 15, 2008 at 11:42 AM.
Post Fiend
Joined: Feb 2007
Posts: 14,541
Likes: 2
From: Dallas-Ft. Worth
Originally Posted by PaysonPSD
I understand why you would want to extend the fuel return line to get it away from the pickup to lessen the chance on introducing air at that point. Would shortening the return line have the same effect? I have never heard that mentioned. Would it have an adverse effect? Does the return line have to be immersed in the fuel?
Plus it will drop right on the pickup when the tank gets low, letting air back under the pickup foot.The reason for the Z-shaped line is to get the return as far from the pickup as possible, and to clear the float. I think one of the guys used rubber hose back the other direction, but I think he wished he did with all SS after thinking about it.
Last edited by Izzy351; Jan 15, 2008 at 12:13 PM.
Post Fiend
Joined: Feb 2007
Posts: 7,191
Likes: 4
From: Blairsville,Ga
[QUOTE=Izzy351] Plus it will drop right on the pickup when the tank gets low, letting air back under the pickup foot.
QUOTE]
if an air bubble did drop down and not float and get to the pickup you would already be out of fuel and it wouldn't matter anyway
Plus it will drop right on the pickup when the tank gets low, letting air back under the pickup foot.QUOTE]
if an air bubble did drop down and not float and get to the pickup you would already be out of fuel and it wouldn't matter anyway
Post Fiend
Joined: Nov 2007
Posts: 9,549
Likes: 14
From: Payson, AZ
Ideally, if the In Tank-Pre Pump MOD does what it is supposed to do there should be no air in the return line. If there is air in the return line then the MOD doesn't work. Is this an accurate statement? I did say ideally.
Senior User
Joined: Feb 2006
Posts: 116
Likes: 0
From: West Central Florida
Originally Posted by PaysonPSD
Ideally, if the In Tank-Pre Pump MOD does what it is supposed to do there should be no air in the return line. If there is air in the return line then the MOD doesn't work. Is this an accurate statement? I did say ideally.
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Fleet Owner
Joined: Jun 2004
Posts: 25,090
Likes: 1,111
From: Rio Rico, AZ.
I have my fuel return pointed a long ways away from where it enters the pickup.
It's the long horizontal steel line that goes along the bottom of the picture.
Never mind the fuel pump attached to the end of it. I'm just showing my pickup to illustrate a good way to route the fuel return line.
It's the long horizontal steel line that goes along the bottom of the picture.
Never mind the fuel pump attached to the end of it. I'm just showing my pickup to illustrate a good way to route the fuel return line.
Last edited by Kwikkordead; Jan 15, 2008 at 01:34 PM.
Post Fiend
Joined: Nov 2007
Posts: 9,549
Likes: 14
From: Payson, AZ
Dan,
I was going to go searching for that pic and came back here and found that you posted it. Big Thanks. This time I saved it off the post. Hope you don't mind.
I was going to go searching for that pic and came back here and found that you posted it. Big Thanks. This time I saved it off the post. Hope you don't mind.
Last edited by PaysonPSD; Jan 15, 2008 at 02:13 PM.
Lead Driver
Joined: Dec 2006
Posts: 7,092
Likes: 145
From: San Diego, CA
I installed the KCM SS HPX and the in-tank/pre-pump mod (both from ITP Diesel) over the last couple of weeks. The HPX made it a smoother idle (especially when cold) and the in-tank mod quieted the injectors down. It's still all kinds of loud (people still turn their heads thinking the garbage truck is coming) but it's not as rough. At idle the diesel rattle is still very noticable, but more from under the engine than on top (no more pumping air through the injectors).
No real SOTP change except my black cloud is bigger when I get on the freeway now. All in all well worth the $200 or so I spent to extend my injector life.
No real SOTP change except my black cloud is bigger when I get on the freeway now. All in all well worth the $200 or so I spent to extend my injector life.