Aux diesel tank in bed question...
I purchased a 2008 Silverado and it already had a 74 gallon aux tank in the bed hooked up to the fill pipe of the main tank. I sold the 74 gallon tank and purchased a smaller 37 gallon but was told no...
Forum Discussion
dave17352 wrote:mich800 wrote:fj12ryder wrote:
Okay, now you got me curious.
Why doesn't the auxiliary tank drain into the main truck tank until the auxiliary tank is empty, when the valve is open? Seems like it would if the auxiliary tank is higher than the regular tank.
What am I missing? Surely it isn't just the seal of the fuel cap?
That is how it works. You can get a tee that fits in the filler neck that has a shut off float in it. If someone just connected to the filler neck without some sort of shut off it would flow to the cap.
Yes some people leave the valve open and the cap should prevent any fuel from coming out. I choose to just open the valve when I run low on fuel. In fact with my 50 gallon tank when I open it, it drains far enough down that the level of the diesel is not higher than my filler cap. So it is really a no brainer. I have a 34 gallon tank.
I choose not to trust everything being spill proof around the cap because it is just so easy to flip the lever once. Literally about once every 800 miles or so. No big deal.
I do it similarly. I flip the valve if I am low with no stations in sight or if fuel prices are high. I typically top off my aux tank when I find a good deal and only use it when prices are rising. My own little futures market.
