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6.5L Diesel Engine Discuss the 6.5 GM diesel engine & associated components. Automatic transmission questions & problems belong in the 4L80/85 - 4L60E - 6L90 Transmission Forum

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Old 08-26-2005, 01:00 PM   #1 (permalink)
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Feeding the Beast

I've been working this angle for a while finally got around to doing something about it. I was looking at a dual lift pump install if you look in my pic here https://dieselplace.com/forum/showthread.php?t=15002 the extra elbow below the vac switch is for the 2nd feed line pending install 2nd pump. Anyway got to looking at the IP inlet and saw it wasn't same size as the rest of my plumbing 3/16" OD roughly is OEM inlet size fitting, well "that ain't good enuff" for a stock rig IP OEM concept is okay, but watching EGT when hauling freight vs rpm vs lift pump pressure, more fuel is needed.

So I started thinking 2nd factory lift pump in parallel, key is volume not psi as if IP has too much psi it dumps back to the tank what it can't use.

Well GM has by design limited just how much flow one can possibly have. look over the attached photos and you will see what I'm talking about. What i fainally wound up with is 1/4" supply all the way to the IP. has is made a difference I think so, I got way more black smoke when I kick it in the rear until turbo spools up, more smoke = more fuel, I haven't had time yet to do last piece, install a Cummins lift pump & see what scanner says for fuel vs rpm data.

Special fitting made for IP inlet to replace OEM, then bored & tapped out the filter housing outlet pipe to accept 3/8 NPT X 1/4" OD barb fitting, hire professional machine shop to do your work if you tap too deep you will ruin the filter housing (YOU have been warned).

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Old 08-26-2005, 01:01 PM   #2 (permalink)
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More pics

More pics

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Old 08-26-2005, 01:10 PM   #3 (permalink)
CanadianRigger
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Your making me think about making some changes...... on second thought i've got all the black smoke i need at this point. Probably a great idea if not running a high output pump. With my dual filter set-up i should really be checking my LP pressure at the IP to see whats happening in there, maybe i do need to do that.
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Old 08-26-2005, 01:23 PM   #4 (permalink)
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Great work and really nice pics!!
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Old 08-26-2005, 07:48 PM   #5 (permalink)
dieseldummy
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Glad to see ya got around to gettin' some things done. I was going to attempt your suggestion on modifying the fuel fittings, but then mine blew up again... Looks good IMO.
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Old 08-26-2005, 08:52 PM   #6 (permalink)
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Excellent work, and great pictures to boot.
I recently upsized my puny supply return hoses to/from the IP, and I was pretty pleased with myself until you started this thread
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Old 08-27-2005, 05:50 AM   #7 (permalink)
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What are your fuel pressure readings like now at you IP? Just curious as I'm sure you must still be using the stock return fitting on the IP which has the little pressure control valve built into it.
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Old 08-28-2005, 02:02 AM   #8 (permalink)
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Haven't plumbed the IP housing to know IP case pressure, yet, got the fitting just haven't plumbed it yet. The lift pump pressure, now more steady minimum now is 2 psi where before when I was gittin it, pressure would go down to .5 psi.
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Old 09-29-2005, 04:02 PM   #9 (permalink)
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There are some clearance issues also to installing the fittings on the IP, I had to mill down the new IP inlet fittings flats to the same size as the old one so I could get a socket to fit on it and also clear the shut off solenoid. I also had a socket turned down for a little more clearance.

BTW the fitting was custom made to begin with, there must be a store bought one available but not here, but I know a good machinest that is fair on his labor so it was easier to have it made rather than track one down, for same money.
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Old 09-29-2005, 04:33 PM   #10 (permalink)
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INTERESTING!! I like this, I have a spair LP and some time on my hands to make a little more fuel appear in my IP. I have a flow meter I might borrow from work. I will rig it up and see what kind of GPM flow the one LP has and post that and I will then link my spare with my current one and see a combined flow.

This is a CHEAP way to increase fuel!! I like cheap (and easy)

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