1*LBrown59, do you mind me asking you how you fill up your tanks when they run low?
2*Do you have someone deliver the fuel, or do you take the drums and fill them up yourself?
The reason I ask is that I've discovered that while a couple 5-gallon diesel jugs works great for my Yanmar, it is not the ideal setup with my Bobcat 753 which can gobble quite a bit more fuel.
3*Short of filling up a drum with fuel in the bed of my truck, then unloading it with my Bobcat when I get back to my place I really can't think of any other way of keeping the drum filled myself, unless I had an auxiliary transfer tank in my truck to pump it out from.
1*No but I need to explain a little bit about my set up and how it works.
There are 3 drums
The first drum is 30 gallons & the main supply drum.The second drum is 55 gallons and holds a reserve fuel supply and acts as the fill drum for the set up.It's the only one I ever fill and it's always empty and gets 55 gallon every time I get fuel .The third drum is 55 gallons and is just a spare to go get fuel in if the need arises.It is not plumbed into the set up and just sets loose there in the corner.
I haven't used the third drum yet as I call the fuel man when the second drum is empty and have him bring me 55 gallon of fuel to fill it up with.
All 3 drums are empty at the moment because I just completed building the set up recently and haven't put any fuel in it yet.
As shown in the above photo there is a red shut off valve on the hoses coming up out of the first and second drums.
I will turn the valve on the first drum off and the second drum valve on and call the fuel guy to bring 55 gallon and fill the second drum .
After he fills the drum I will then fill the first drum with 30 gallons from the second drum using the set ups pump leaving 25 gallon in the second drum.Next I shut off the valve on the second drum and open the valve on the first drum .
After the 30 gallon drum is used up and empty I will then pump the 25 gallon that was left in the second drum into the first drum and call the fuel man and order another 55 gallon fill up for the second drum.This gives me 25 gallons to go on while waiting on the delivery guy to show up so I'm not likely to run out before he gets here.
It may sound a little complicated and involved but it's really very simple and easy to operate.
2*I built the system so that I can do it either way.
3*You don't need an auxiliary transfer tank in your truck to pump it out from because you use the set ups pump .
The following pictures show me doing that IE pumping fuel out of a drum in my pick up into the set ups drum.

Notice there is no pump on the drum in the truck just a hose stuck down in the blue drum..
If you go back and take a closer look at the larger photo you will see this hose curled on a green hose hanger.The hose has a white end on it.

This is the set ups pump that I'm doing the pumping with.