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Thread: Fuel System for a 2006 Duramax

  1. #1

    Default Fuel System for a 2006 Duramax

    I just want to make sure I am understanding the fuel system correctly for my 2006 Duramax. I installed a dual lift pump setup (Kennedy), along with a Nicktane pre-filter setup in the rear next to the fuel tank, as well as the Nicktane setup in the front replacing the OEM filter (Both 2 micron spin on HE filters). While my truck is running at idle, my lift pumps continuously pump fuel through the lines and through the fuel rail. If it is not needed, the extra fuel runs back into the tank, and that makes a continuous circle over and over again. Am I correct in this understanding of how the fuel system works? So in theory, the fuel gets continuously filtered over and over again, constantly running through the filters? Thank you in advance for your help in this fuel related matter.
    2006 Chevrolet 2500 HD LLY Duramax
    LT3 4WD Allison 6 Speed CCSB
    FS2500 Bypass Oil Filter, Kennedy Twin Lift Pumps, Dual Nicktane Fuel Filters, Coolant Filter, All On Headlight Mod, Rhino Liner / Trac Rack, Lund Interceptor Wind Deflector, Recon Rear Light Bar, 34 FT. Keystone Cougar TT, PML Rear Differential Cover, Tekonsha Prodigy Brake Controller, Putnam XDR Class 5 Receiver, Reese Dual Cam HP Strait Line Hitch, Stainless Tie Rod Sleeves, PPE Deep Pan with Transynd, Stanandyne Fuel Supplement, 265/75/16 General Grabber HTS Tires, Filter Mags All The Way Around


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  2. #2
    Quarter Million Worth btfarm's Avatar
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    It would seem more likely that the excess from the lift pump would bypass direct to tank which means it only sees the suction side filter.
    Last edited by btfarm; 05-03-2011 at 02:53 PM.
    Mike
    2006 GMC 2500HD LBZ ext/sb Black. 265,000 miles and 6085 hrs as of 8/19/14. Predator tune (at 133k) WAS Totally stock except tires (285 BFG KOs), hitch, Line-X over the rail. Westin bars, Adrian crossover box, Putnam XDR Class V hitch / Prodigy Brake control. Blocked, fingered and pcv reroute. Full 4" Diamond Eye SS Exh from Leroy Diesel
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  3. #3
    Member Advocate Pepperidge's Avatar
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    not sure at what point the excess fuel is returned to the tank...IIRC I believe it is once it passes the CP3 the excess fuel is sent back to the tank...meaning you are using both filters"polishing your fuel...

    The lift pumps really have little to do with excess fuel (but not completely true...it does some now that you've added them) returning to tank but the CP3 is largely responsible for excess fuel volume and pressure causing the unused fuel to be returned to the tank...remember...we didn't come stock with a lift pump and there was excess fuel returning to the tank before adding lift pumps...the fuel is filtered by both your pre-filter(if you have one)and OEM location before going to the CP3...

    so yes Jeff you are correct in your understanding...
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  4. #4

    Default

    Thanks. I forgot to throw in there about the CP3. A little Freudian slip I guess.
    2006 Chevrolet 2500 HD LLY Duramax
    LT3 4WD Allison 6 Speed CCSB
    FS2500 Bypass Oil Filter, Kennedy Twin Lift Pumps, Dual Nicktane Fuel Filters, Coolant Filter, All On Headlight Mod, Rhino Liner / Trac Rack, Lund Interceptor Wind Deflector, Recon Rear Light Bar, 34 FT. Keystone Cougar TT, PML Rear Differential Cover, Tekonsha Prodigy Brake Controller, Putnam XDR Class 5 Receiver, Reese Dual Cam HP Strait Line Hitch, Stainless Tie Rod Sleeves, PPE Deep Pan with Transynd, Stanandyne Fuel Supplement, 265/75/16 General Grabber HTS Tires, Filter Mags All The Way Around


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  5. #5
    McLovin stacks04's Avatar
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    Yes the bulk of the fuel comes back via the pump, the other major contributer is the injector returns. When you doing a throttled run and let off the excess from the injector bodies goes through the return tubes and back. There is no return line pre engine filter. Yes our fuel is very filtered
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  6. #6

    Default

    That is what I was looking for I guess. The fuel gets filtered over and over and over again. Thanks to all for helping me understand the fuel system a little more clearly.
    2006 Chevrolet 2500 HD LLY Duramax
    LT3 4WD Allison 6 Speed CCSB
    FS2500 Bypass Oil Filter, Kennedy Twin Lift Pumps, Dual Nicktane Fuel Filters, Coolant Filter, All On Headlight Mod, Rhino Liner / Trac Rack, Lund Interceptor Wind Deflector, Recon Rear Light Bar, 34 FT. Keystone Cougar TT, PML Rear Differential Cover, Tekonsha Prodigy Brake Controller, Putnam XDR Class 5 Receiver, Reese Dual Cam HP Strait Line Hitch, Stainless Tie Rod Sleeves, PPE Deep Pan with Transynd, Stanandyne Fuel Supplement, 265/75/16 General Grabber HTS Tires, Filter Mags All The Way Around


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  7. #7
    Edjumacated Redneck BudTX's Avatar
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    It gets passed through the filters over and over again, but I don't see any filtration benefit after the first pass through. 3 microns is still 3 microns. Its not like something slipped through the first time and will get caught later, correct?
    2004.5 Chevrolet Duramax 2500HD CCSB 4x4 LLY; PPE Hot +2 set on "kill"; Suncoast Stage IV with 1057 converter, Allison deep pan, S&B intake; FASS 150; fuel shim mod; MBRP 4" stainless exhaust; Autometer gauges; pump rub mod; blocked, braced, sleeved, plugged, etc. Special Thanks to St. Joe Diesel!

  8. #8
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    The entire surface of the filter media isn't all the same micron level. The rating just means the biggest particle that will pass. Some areas will filter smaller particles so theoretically it could continue to filter out smaller particles that had previously passed through.
    Mike
    2006 GMC 2500HD LBZ ext/sb Black. 265,000 miles and 6085 hrs as of 8/19/14. Predator tune (at 133k) WAS Totally stock except tires (285 BFG KOs), hitch, Line-X over the rail. Westin bars, Adrian crossover box, Putnam XDR Class V hitch / Prodigy Brake control. Blocked, fingered and pcv reroute. Full 4" Diamond Eye SS Exh from Leroy Diesel
    Towing Interstate 1 7' x 18' utility trailer (10k) usually at limit or more
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  9. #9

    Default

    That I am not sure about. I just wanted to make sure that I was understanding the fuel system flow correctly. You're right though Bud. 3 micron is 3 micron. The injectors should pass that fine with no problems. It is the bigger particles that I would be concerned with. The High Efficiency Filters are excellent at doing their job. When I do my yearly maintenance on June 1st, I will once again, cut open the filters and take a good look at them. It makes me feel better.
    2006 Chevrolet 2500 HD LLY Duramax
    LT3 4WD Allison 6 Speed CCSB
    FS2500 Bypass Oil Filter, Kennedy Twin Lift Pumps, Dual Nicktane Fuel Filters, Coolant Filter, All On Headlight Mod, Rhino Liner / Trac Rack, Lund Interceptor Wind Deflector, Recon Rear Light Bar, 34 FT. Keystone Cougar TT, PML Rear Differential Cover, Tekonsha Prodigy Brake Controller, Putnam XDR Class 5 Receiver, Reese Dual Cam HP Strait Line Hitch, Stainless Tie Rod Sleeves, PPE Deep Pan with Transynd, Stanandyne Fuel Supplement, 265/75/16 General Grabber HTS Tires, Filter Mags All The Way Around


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