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I have done a ton of digging and the one thing that is holding me up is the return line from the lift pump.
I plan on running a Beans sump with Fass 165. where does the return line connect? i plan on installing directly under the sending unit and most sumps use a 6" return tube, i do plan on drilling a hole in the bottom of the basket but not sure if this will allow adequate room for the tube. any insight is appreciated!
 

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Don't know about the 2015 but the older trucks returned fuel to the filler neck, Fass should come with instructions.
 

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Depends. If you get the right sump it'll have a port for the return in the sump. Otherwise the return will be the filler neck
 

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MY 2014 was in the neck
 

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Depends. If you get the right sump it'll have a port for the return in the sump. Otherwise the return will be the filler neck
He actually stated that he planned on running the Beans sump.
 

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I have done a ton of digging and the one thing that is holding me up is the return line from the lift pump.
I plan on running a Beans sump with Fass 165. where does the return line connect? i plan on installing directly under the sending unit and most sumps use a 6" return tube, i do plan on drilling a hole in the bottom of the basket but not sure if this will allow adequate room for the tube. any insight is appreciated
Honestly if your Duramax is stock or slightly modified (even up to 600hp) the 165 is overkill for what you are needing. Actually the 165 usually for some will require the sump to keep the 1/4 tank issues at bay because the 165 will circulate enough fuel to drain the sending unit basket. If you wish to go the route of adding the sump fine but you are spending more money that what is needed to supply fuel to the CP3/4. Dean

PS. The FASS installation will have you cut the fill hose and splice in return line but with a sump you can have the lift pump return directly to the sump if that is what you wish. D
 

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2016 Chevrolet Silverado Duramax
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On my 2016 Duramax, I put the return line at the filler neck.
 

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2016 Chevrolet Silverado Duramax
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The lift pump I received came with the return filler neck adapter. I just cut the filler neck and installed it inside.
 

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I run the XDP sump and drilled in tank directly under basket and chose not to use the pipe for return. I'm also running the 165gph and have never once suffered from any fuel related issues.
 

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I have done a ton of digging and the one thing that is holding me up is the return line from the lift pump.
I plan on running a Beans sump with Fass 165. where does the return line connect? i plan on installing directly under the sending unit and most sumps use a 6" return tube, i do plan on drilling a hole in the bottom of the basket but not sure if this will allow adequate room for the tube. any insight is appreciated!
I installed a FASS 165, FASS sump, deleted the stock fuel filter also use Hotshot EDT. Have not and issues, little better mileage.
I have done a ton of digging and the one thing that is holding me up is the return line from the lift pump.
I plan on running a Beans sump with Fass 165. where does the return line connect? i plan on installing directly under the sending unit and most sumps use a 6" return tube, i do plan on drilling a hole in the bottom of the basket but not sure if this will allow adequate room for the tube. any insight is appreciated!
I installed a FASS 165, FASS sump, deleted the stock fuel filter also use Hotshot EDT. Have not and issues, little better mileage.
 
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