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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, 08:37 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, 11:07 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 11:33 AM. Reason: sig
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Old 06-20-2019, 11:50 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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Old 11-20-2019, 11:26 PM   #14 (permalink)
Fireball69
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Quote:
Originally Posted by D_R_C View Post
I have a RDS 60 gallon aux tank with tool box, electric pump with normally closed solenoid on a switch when running warning light in the cab, powered only when ignition is on.

I also have an RDS 60 gallon aux and with tool box. I had an electric pump failed after nine months of use (twice) I decided to go to gravity feed. Now I'm getting the P0461 Fuel Level Sensor A circuit Range /Performance fault (fuel gauge reads empty and check engine light). I need to go back to the pump.

What electric pump and solenoid valve are you using? Thanks.
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Last edited by OkDually; 11-20-2019 at 11:51 PM. Reason: repaired quote
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Old 11-21-2019, 08:59 AM   #15 (permalink)
18LP5
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I use a Facet pump w/no solenoid. The pump is designed to internally prevent thru-flow unless the pump is running. Never had an issue with the tank draining thru the pump when the pump is off. I have a manual fuel shutoff at the tank outlet located in the bed of the truck. I'll keep this closed off unless I intend to use the aux tank which I only do when towing my RV, but even with it open the tank will not drain unless the pump is on.
Facet makes lots of different pumps for pretty much any type of service. If you want a pump that does allow flow-thru they have them. My pump is one of their 'Gold Flo' models. A small cylinder designed to be mounted vertically & has an inlet and outlet port. Also has a built in strainer that's removable for cleaning/replacing.

Facet's website has features to help you sort thru all their pump types/purposes.
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Old 11-21-2019, 12:07 PM   #16 (permalink)
D_R_C
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There’s many that will work
Normally closed solenoid
Fuel Tank Selector Valve - Universal CRB22057
Mines from NAPA

Fuel pump
Carter P4070 In-Line Electric Fuel Pump
Amazon carries this

The solenoid is used as a safety back up incase fuel gets by the fuel pump, wired inline with the fuel pump on ignition power with a switch in the cab.
Aux tank fuel pulled thru the top thru fuel filter - fuel pump - solenoid - to main tank T into the vent line.
Picture sideways, but this should give you a idea.

I’ll pm you the links
The links will not work, sorry
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AirDog 4G100


2007 GMC Yukon Denali "BLACK" 6.2 gasser, DIY stock airbox mod, K & N OEM drop-in, Airaid intake tube, EFILive TCM tuned

Last edited by D_R_C; 11-21-2019 at 12:15 PM.
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Old 11-21-2019, 02:34 PM   #17 (permalink)
Oregonnovaguy
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I use a 3/8” ball check valve, available at any marine supply shop. I too have plumbed mine into the relief vent hose, near the filler cap. You also might consider a return line, since your auxiliary tank is bigger than your main tank, so if you forget to turn off the pump you won’t have a Exxon Valdeze-sized spill to deal with.
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Old 11-21-2019, 06:52 PM   #18 (permalink)
Towing Dude
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My auxiliary tank is plumbed into the filler hose. I fill up the main tank first, then fill up the bed tank. I leave the valve open all the time. My gauge reads full until the bed tank is empty and then the gauge acts normally. If I drive more than 150 -200 kms. at a time, the gauge will drop to empty and check engine light comes on. BUT, it automatically resets when you shut truck off. Had it in my '11 for 8 years and my '15 for over a year, ZERO troubles, no leaks, Nada!( just don't take factory filler cap off when bed tank is full!)
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Last edited by Towing Dude; 11-21-2019 at 06:56 PM.
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Old 11-22-2019, 11:22 AM   #19 (permalink)
D_R_C
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Me having my AirDog return line plumbed into the fill neck, the vent was the best option.

It’s not easy to control a ball valve from inside the cab if ever needed, you’ll have to pull over and get out.

Having a solenoid valve would be a better option to open and close when needed from inside the cab.
Gravity flow and having gauge issues and codes try just cracking the valve open for a slower fill.

Checking your state dot laws on plumbing a aux tank might be worth doing, if your ever in a accident and a fuel spill is present there will be a very large fine, no questions asked.

I have this switch with light when my transfer pump is on, I also have a small flashing LED light next to my CTS2 as a constant reminder when fuel is transferring .
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__________________
2007.5 GMC "Black" Sierra SLT 3500HD SRW C.C. 4X4 LMM Z71
DIY stock airbox mod, aFe ProGuard 7, OEM drop-in
EFILive ECM ATP - Heavy Tow Tune with Turbo Brake
EFILive TCM Duramax Tuner
DHD Cold Side High Flow Intake Pipe
DHD PCV Re-route
AirDog 4G100


2007 GMC Yukon Denali "BLACK" 6.2 gasser, DIY stock airbox mod, K & N OEM drop-in, Airaid intake tube, EFILive TCM tuned

Last edited by D_R_C; 11-22-2019 at 11:30 AM.
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Old 11-22-2019, 04:53 PM   #20 (permalink)
Oregonnovaguy
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Ball CHECK valve. It is a spring-loaded ball that automatically opens when the pump is running, but closes when the pump is off, preventing siphoning.

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"Tolerance becomes a crime when applied to evil" Thomas Mann
“If you can live amid injustice without anger, you are immoral as well as unjust.” -St. Thomas Aquinas
"When any nation mistrusts its citizens with guns, it is sending a clear message. It no longer trusts its citizens because such a government has evil plans." - George Washington -

2007.5 Silverado LTZ / Z-71, 4x4, Crew Cab SB, Silver Birch/ Ebony Leather, , 150k + miles, , etc. Gearbox Z, Air Lifts
Montana High Country 310RE
My Other other Car: 70 Nova SS 350, 4 speed, posi, Fathom Blue, frame-off resto, original owner!
Previous Trucks: '03 Silverado CC gasser 4x4, '99 Sierra Ext. Cab 4x4, '77 Dodge Power Wagon 4x4, '76 Datsun 620.

Read the DISCLAIMER in my garage.
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