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Fuel System, Air, Exhaust, & Emissions Upgrades Discuss upgrades to the Duramax fuel system and air system. Bigger turbochargers, more turbo chargers, air boxes, exhaust systems, emissions systems, and fuel pumps all go here.

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Old 05-07-2019, 07:37 AM   #11 (permalink)
cwq21
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I have a NC solenoid wired through the ignition and it's gravity fed.
When traveling, I turn the switch on when the fuel level is at about 1/2 tank and turn it off when full. No issues with the computer thinking the gauge is faulty.

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Old 06-20-2019, 10:07 AM   #12 (permalink)
lhe
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Quote:
Originally Posted by cwq21 View Post
I have a 45 gallon aux. tank and solenoid valve on mine and flip the switch inside when I need it and turn it off when I'm full. On my 2003 I just had a manual valve and left it open all the time and after driving ~150 miles my fuel gauge would show empty but once the aux. tank ran empty and my main tank level started dropping the fuel gauge would start showing a level again.
I'm in the process of an identical install on my 2018 3500HD Duramax. As I tee'd into the filler neck it occurred to me that pumping fuel while driving (factory fuel cap on, of course) would (might?) cause positive pressure in the filler neck and tank. Did you do anything vent the positive pressure? Any issues as a result of the positive pressure? Thanks for the help.

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Last edited by OkDually; 06-20-2019 at 10:33 AM. Reason: sig
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Old 06-20-2019, 10:50 AM   #13 (permalink)
D_R_C
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Less problems when you T into the vent line and stop transferring when your gauge gets to about 3/4.
The gauge is slow reacting to the fueling, if you allow it to get to full I think this is one reason some have gauge issues and not corrected until you shut down and restart.
I’ll stop mine at 3/4 by the time the gauge settles mines close to full.
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