Full injectors would work a lot better with something that can completely empty them. 
Second fuel filter
FTE Leadership Emeritus
Joined: May 2001
Posts: 13,653
Likes: 6
From: Cabot, Arkansas
Unless my pre pump filter is releasing it, I should not have any air issues. I've pretty much done every fuel mod there is....Still, I do fuly expect to notice something....just not sure what yet.
Kinda hoping for a little better power and economy. Thiking maybe the little pump will make it easier for the big pump to jam the injectors a little fuller.
Is fuller a word? Maybe "more completely fill the injectors" is a better choice.
Kinda hoping for a little better power and economy. Thiking maybe the little pump will make it easier for the big pump to jam the injectors a little fuller.
Is fuller a word? Maybe "more completely fill the injectors" is a better choice.
FTE Leadership Emeritus
Joined: May 2001
Posts: 13,653
Likes: 6
From: Cabot, Arkansas
Yeah...I've been talking to Swamps the last few days....I'm right on the verge of ordering a set of 175/173 single shots and a new chip to run them.
I know I want em....no, I need them.....no, I DESERVE them. I'm just a wee bit leery of breaking something big...that's the only hold up.
I know I want em....no, I need them.....no, I DESERVE them. I'm just a wee bit leery of breaking something big...that's the only hold up.
Lead Driver
Joined: Oct 2004
Posts: 7,413
Likes: 1
From: Columbia, MO
There's a couple of reasons. First, if you plan on bigger injectors, but don't want to lay out the money for a pump an injectors at the same time, the pump is the logical first step. Then, you know you've got plenty of oil pressure when you do upgrade injectors. Second, a bigger/dual HPOP has proven to increase power across the whole RMP range with stock injectors. The power curve no longer falls off at the top end of the RPMs. The increase in pressure is better able to use all of the fuel in the injectors, as well as increase the atomization of the fuel for better burn. You should also see some lower EGTs. Reprogramming of the chip is a good thing to do too.
Post Fiend
Joined: Feb 2006
Posts: 11,892
Likes: 2
From: Middle Tennessee
Originally Posted by cookie88
I ordered a Carter pro series 72GPH @ 6psi pump last week. Should be here thursday. Been burning up stock pumps at the rate of 1 every 18 months since I put the big primary on.
Fleet Owner
Joined: Jun 2004
Posts: 25,090
Likes: 1,112
From: Rio Rico, AZ.
Originally Posted by cookie88
I ordered a Carter pro series 72GPH @ 6psi pump last week. Should be here thursday. Been burning up stock pumps at the rate of 1 every 18 months since I put the big primary on.
I didn't like the sound that my pump was making on cold mornings so I relocated my pump back to the top of the fuel tank. It sorta helped but didn't cure the cavitation sounds that my pump makes on the Bio-diesel.
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Hotshot
Joined: Jan 2002
Posts: 17,988
Likes: 207
From: La La Land
If using a Dahl or Raycor of a similar design, with a depressurizer cone, the use of a "feed pump" may not be the best idea.
Water and particulate separation is enhanced by the fuel flowing thorugh a "depressurizer cone". A quote from Dahl site:
"As fuel is discharged from the depressurizer cone, 80% of contaminant separation takes place. Most of the solid particles and water settle into the quiet zone of the bowl."
I suspect that the precipitation of water from the fuel is somewhat dependant on the lowering of the pressure of the fuel while passing through.
Will pressurizing a filter of that design defeat the ability to draw the water out of the fuel by defeating depressurization?
Of course, this all applies only to those kinds of filters, and is not a consideration with standard-media types.
Pop
Water and particulate separation is enhanced by the fuel flowing thorugh a "depressurizer cone". A quote from Dahl site:
"As fuel is discharged from the depressurizer cone, 80% of contaminant separation takes place. Most of the solid particles and water settle into the quiet zone of the bowl."
I suspect that the precipitation of water from the fuel is somewhat dependant on the lowering of the pressure of the fuel while passing through.
Will pressurizing a filter of that design defeat the ability to draw the water out of the fuel by defeating depressurization?
Of course, this all applies only to those kinds of filters, and is not a consideration with standard-media types.
Pop
Last edited by SpringerPop; Mar 22, 2006 at 10:45 AM.
Thread Starter
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Elder User
Joined: Feb 2006
Posts: 560
Likes: 0
From: San Diego, CA
Will these aftermarket fuel filters such as the Dahl cause any problems with the stock fuel pump? It seems some people are concerned about this or are they worried when they add the new injectors and other mods they won't be able to deliver the fuel?
Hotshot
Joined: Jan 2002
Posts: 17,988
Likes: 207
From: La La Land
If I were going to "big oil", I would be using a more robust fuel pump and using a properly-sized Dahl to handle the additional flow requirements.
These units are of a design that's been proven over many, many years in OTR and marine diesel environments. They do the job they were designed to do. Larger flow requirements simply means using a larger, properly-sized unit.
Using a two-micron element (or any size, for that matter) would sure have prevented the problem that caused Kwik to replace his pump.
Pop
These units are of a design that's been proven over many, many years in OTR and marine diesel environments. They do the job they were designed to do. Larger flow requirements simply means using a larger, properly-sized unit.
Using a two-micron element (or any size, for that matter) would sure have prevented the problem that caused Kwik to replace his pump.
Pop
Last edited by SpringerPop; Mar 22, 2006 at 10:09 AM.
Lead Driver
Joined: Oct 2004
Posts: 7,413
Likes: 1
From: Columbia, MO
Originally Posted by SpringerPop
If I were going to "big oil", I would be ... using a properly-sized Dahl to handle the additional flow requirements.
Originally Posted by SpringerPop
Using a two-micron element (or any size, for that matter) would sure have prevented the problem that caused Kwik to replace his pump.
Pop
Pop
http://putfile.com/pic.php?pic=1/2022243161.gif&s=x4
Lead Driver
Joined: Oct 2004
Posts: 7,413
Likes: 1
From: Columbia, MO
It suprised me just how small 2 microns is. Anyone know what the micron rating is on the factory fuel filter in the bowl? Reason I ask, is I'm thinking having 2 filters may be a little reduntant, and I may just get rid of the factory bowl alltogether. Reason is, when I upgrade to the BTS oil pump, it's a stacked design rather than two inline pumps. It requires raising the fuel bowl. But, I spent a good bit of time on the phone yesterday with Zane over at Wide Open Performance, and he suggested just getting rid of the factory bowl alltogether if I've got a good pre-pump filter. They're running several trucks like that and have notices no problems. That certianly would make plumbing easier for the fuel lines, especially if I upgrade to bigger lines from the tank to the engine. It makes sense though. Why filter it twice when the first one is probably taking care of all the filtering and water seperation. I just want to know what the factory filter's micron rating is, because I don't want to go bigger than that.
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Kdr358
1999 - 2003 7.3L Power Stroke Diesel
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