For those of us that are adding gravity feed auxiliary tanks.
I have attached a picture of what I used on my last truck, and what I have also put together to use on my new tank for the 2022 RAM I have ordered.
I am only posting this, because I have had no issues with gravity feed with this setup (and it might help others).
It actually doesn't just keep up with the fuel usage, but will top off the tank as you drive, without a fuel pump.
The key problem I found was the kit supplied by the manufacture says it's a 3/8" valve, but it actually only has about a 3/16" orifice.
What I do not show in the picture is that I continue a 1/2" ID fuel hose from the 1/2" barbed fitting in the picture, down to the adapter at the main tank fill hose.
I then have a 1/2" barb to 5/16" barb reducer to connect to the roll-over valve on the fill hose adapter.
I use a 1/2" 12V solenoid valve, because I could not locate a full port 3/8" solenoid valve.
I also will be wiring the 12V solenoid valve to one of my auxiliary switches in the cab (just make sure it is wired to a switch that only receives power with the ignition on).
You don't really need the 12V solenoid valve, it just makes everything more convenient to turn flow on/off from the cab (instead of manually).
I did this setup after I noticed that most barb fittings also reduce the flow (i.e a 1/2" barb fitting only measures 3/8" ID).
Just some thoughts.
I have attached a picture of what I used on my last truck, and what I have also put together to use on my new tank for the 2022 RAM I have ordered.
I am only posting this, because I have had no issues with gravity feed with this setup (and it might help others).
It actually doesn't just keep up with the fuel usage, but will top off the tank as you drive, without a fuel pump.
The key problem I found was the kit supplied by the manufacture says it's a 3/8" valve, but it actually only has about a 3/16" orifice.
What I do not show in the picture is that I continue a 1/2" ID fuel hose from the 1/2" barbed fitting in the picture, down to the adapter at the main tank fill hose.
I then have a 1/2" barb to 5/16" barb reducer to connect to the roll-over valve on the fill hose adapter.
I use a 1/2" 12V solenoid valve, because I could not locate a full port 3/8" solenoid valve.
I also will be wiring the 12V solenoid valve to one of my auxiliary switches in the cab (just make sure it is wired to a switch that only receives power with the ignition on).
You don't really need the 12V solenoid valve, it just makes everything more convenient to turn flow on/off from the cab (instead of manually).
I did this setup after I noticed that most barb fittings also reduce the flow (i.e a 1/2" barb fitting only measures 3/8" ID).
Just some thoughts.
