[slaveToHorses]

I have essentially what you are proposing. It works great. I had power nearby so I went with a 115v pump. I keep track of my fueling on the various equipment and road vehicles so I added the meter. I have checked it against cans and it is within 0.1g, which is about as close as I can expect to measure it using a can. Good enough for my purposes.

I put the water filter first due to it's larger particulate rating. Not sure if that is best. Could do with only one but the cost of an extra filter is pretty low over the life span of the system.

I worried about the extra strain of the filters and nipples but I am the only one that uses it and I am careful. One of these days I will probably make a support...or not.

I kept the manual nozzle because it is smaller diameter and that helps when trying to look past it into the tank or can. It doesn't take long to fill even large tanks so I have had no incentive to change to an automatic fill. Except that the plastic cover would be nice when it is cold out! That aluminum handle can get really cold.

Here are some photos, for fun. The wide angle lens makes the close up of the filters seem curved.