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  #1  
Old 03-22-2014, 02:27 PM
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a5150nut a5150nut is offline
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Default Fuel pressure

John,

Where is the best location to monitor fuel pressure on a 2006 DMax fuel rail or line going to pump?

I have a 2 micron pre filter back at the tank and was thinking of adding a fuel pump there also.

And what are the expected readings for both locations?
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  #2  
Old 03-22-2014, 03:41 PM
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If John's doing it right, he's taken the day off. So, I'll jump in.

(Caution)
The "rail" is subject to near 30,000 PSI. You'll need a special gage and hardware for that. Probably not something you'll do. If you want to know the rail pressure, use a scanner (the PCM reports it).

The remainder of the OEM system (between the high pressure pump and tank) is 100% suction. No "pressure" to monitor, only vacuum. It is beneficial to monitor it, though, as it will indicated the health of the filter(s).

If you add a lift pump near the tank, similar to the 6.5L, this changes the system. I recommend installing a gage between the "last" filter and high pressure pump. This will also allow you to monitor filter health, to some degree. It depends much on the grade of pump you will be using. High volume, low pressure is recommended. Any pressure above zero PSI is beneficial, in that prevention of any vacuum is the goal. 4-8 PSI is a good range. If the pump flow is sufficient, it will keep up under full load, even if the pressure drops to near zero. Take into account a filter that's "used up" will reduce that.

Have a look at John's website, specifically the fuel pressure gage tool. It describes what you may see, and what adding his pump(s) will do for the system. I have the gage, and it's very handy.
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  #3  
Old 03-27-2014, 07:38 AM
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Thanks DMax. That is more of what I had in mind. I have a CAT fuel filter mounted just in front of the left wheel on what looks like a shop made bracket. It has a vertical plate on the cab side of the filter and would make a nice home for one of Johns pumps.

Filter is already plumed in so all I need to do is determine tank side of line and add the pump and a gauge up front.

Tried to scour the web to see if this filter mount was a kit the PO had used but all I see now is adaptors to mount a CAT filter in place of OE filter. Now if I still had my Way Back machine and could go back to 2006 when it was put in. . . . .
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  #4  
Old 03-27-2014, 04:16 PM
AKMark AKMark is offline
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I would guess you have this.


http://atptrucks.com/duramax-cat-ada...at-filter.html


I know a few folks running it, and plan to upgrade mine this summer.
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  #5  
Old 03-27-2014, 05:32 PM
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Quote:
Originally Posted by AKMark View Post
I would guess you have this.


http://atptrucks.com/duramax-cat-ada...at-filter.html


I know a few folks running it, and plan to upgrade mine this summer.
No, I have a pre filter mounted behind the cab to the bottom of the bed rails.
http://www.thedieselpageforums.com/t...php?albumid=37

I have found the one your talking about along with a few knock offs. This looks shop built. Laser cut, crisp bends, well fit.
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  #6  
Old 03-28-2014, 10:48 AM
AKMark AKMark is offline
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Wow, that's different, but probably does a great job.
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05 2500HD CC LB LLY, 4x4, 3.73s 235/85R16's, webasto cab heater, to keep it warm.
03 Buick Rendezvous - When you average over 80 miles per day driving around, you need one of these.
85 K-5, 6.2, SM465, Rockwell T221, 1 tons, 36's. More goodies to be installed as time and money allows.
82 K20, 6.2, SM465, NP208, stock except for bed rack, snow plow, and glow plugs are on a toggle switch. It works great for plowing!
72 Postal Jeep - Yet another project
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  #7  
Old 04-01-2014, 11:33 AM
Kennedy Kennedy is offline
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Quote:
Originally Posted by a5150nut View Post
John,

Where is the best location to monitor fuel pressure on a 2006 DMax fuel rail or line going to pump?

I have a 2 micron pre filter back at the tank and was thinking of adding a fuel pump there also.

And what are the expected readings for both locations?
Sorry it's going to take me a bit to remember this forum is here.

I don't actively monitor fuel system restriction/pressure. Instead I have a gauge that I use as a tool to check periodically.




I won't get caught up in all the 2 micron over rating BS, but I will say that I do not care to have the best filter first in line and also don't care to have to do a quick filter change on the road as it means wearing diesel.
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Old 04-01-2014, 11:34 AM
Kennedy Kennedy is offline
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Quote from my site:

Restriction can be checked at idle speeds and at 2-3,000 RPM. Typically we will see approximately 2-3"hg at idle with very little variance as RPM increases. As a filter loads up, you will see restriction increase. When you hit about 5-6" hg (2" above baseline) I consider the filter well used and due for replacement. The early Dmax single layer media filters would run a long time without much of an increase in restriction. The latest dual media units seem to be doing a much better job of collecting dirt, but start at a higher restriction that rises quickly as they load up. Having this gauge on hand allows you to quickly and easily verify the condition and can be very beneficial when diagnosing fuel system related drivability issues. Typical OE filter life is < 15,000 miles. We have seen these filters load as early as 2500 miles or less depending on fuel quality.
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Kennedy Diesel-owner
More than just a salesman-I use and test the products that I sell on a daily basis!
Superflow Lie Detector in house
2002 Chev K2500HD D/A CC Long LT 11.77@ 124mph at 7700# fuel only-e.t. needs help
2005 Chev K3500SRW D/A CC Long LT(SOLD)
2007 Chev K2500 Classic EC Short LT (Sold)
2012 GMC K3500SRW D/A CC Long LTZ Happy Birthday to me! Built 1 working day after my birthday and delivered 7 days later.
2016 GMC K3500SRW D/A CC short LTZ

Custom tuning in house using EFI Live tuning software!
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  #9  
Old 04-01-2014, 02:06 PM
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a5150nut a5150nut is offline
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Quote:
Originally Posted by Kennedy View Post
Sorry it's going to take me a bit to remember this forum is here.

I don't actively monitor fuel system restriction/pressure. Instead I have a gauge that I use as a tool to check periodically.



I won't get caught up in all the 2 micron over rating BS, but I will say that I do not care to have the best filter first in line and also don't care to have to do a quick filter change on the road as it means wearing diesel.
That's alright John, change takes time.

And I agree primary should be a rock filter, secondary a little finer. But that is the way the truck came. I am considering one of your pumps between the tank and primary filter. 1/2 in line is already there just need the pump and two fittings and drill the bracket to mount the pump to it. I already have a Donaldson 4 mic to replace the stock filter.

I was just trying to find some sort of fuel pressure guage to monitor filter life. If nothing else a <1lb murphy switch and an idiot lite.
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  #10  
Old 04-02-2014, 01:35 PM
Kennedy Kennedy is offline
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I prefer to shut the pump(s) down and go by restriction as it's more precise. Otherwise any gauge any place just keep the scale small.

The OE filter is 4 micron these days. Not sure about the WIX plastic garbage, but a true OE spec multi layer element would be.
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Kennedy Diesel-owner
More than just a salesman-I use and test the products that I sell on a daily basis!
Superflow Lie Detector in house
2002 Chev K2500HD D/A CC Long LT 11.77@ 124mph at 7700# fuel only-e.t. needs help
2005 Chev K3500SRW D/A CC Long LT(SOLD)
2007 Chev K2500 Classic EC Short LT (Sold)
2012 GMC K3500SRW D/A CC Long LTZ Happy Birthday to me! Built 1 working day after my birthday and delivered 7 days later.
2016 GMC K3500SRW D/A CC short LTZ

Custom tuning in house using EFI Live tuning software!
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