How Does DeeZee Aux Tank Fill Main Tank of Vehicle
Updated 11/17/2025 | Published 12/09/2024
Question:
Looking at your DeeZee auxiliary fuel tank. DZ91752X My question is how does it transfer fuel into your regular fuel tank. I saw a picture of a tee that was plumbed into the main fuel line and is it gravity fed, because to me it would over fill your main tank. Does it have a pump? No one has quite answered that question or anybody looking at these is a whole lot smarter than me.
asked by: Eddy
Expert Reply:
Hey Eddy, so the DeeMax aux fuel tank part # DZ91752X is a gravity feed design and does not use any pumps. So what does that mean as far as over filling? If the fill line has a check valve built into it then you are okay to leave it open as that would prevent it from over filling. If there isn't a check valve then you'd have to open it, let the tank fill till it's near full and then close it.
(click to enlarge)
Product Page this Question was Asked From
DeeZee Truck Bed Auxiliary Tank - Rectangle - Aluminum - 39 Gallon
- Fuel Transfer Tank
- Auxiliary Fuel Tank
- Rectangular Tank
- Aluminum
- Small Capacity
- Diesel Only
- Silver
- DeeZee
more information >
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on Fuel Transfer Tank
Jameson C.
11/17/2025
Hey Eddy, how did things go with the gravity feed setup on your DeeZee auxiliary fuel tank? Did the check valve help keep your main tank from overfilling? Your update could make it easier for others looking at the same design.