Yes all valid points The voltage drop on the feed side is just over a volt. The feed wire is long and too small in my opinion. Ground side is less than half a volt.New relay as well. I was thinking the same batch as well. However, there is something funky going on in the design of the tank. Pump on one side and regulator on the other, saddle tank. Wondering if there is something wrong there?
Thanks
Curt