[banditpowdercoat]

I can see where I got screwed up. The volume increases in the larger pipe. and pump only displaces a certian amount of water. Ya the larger pipe will not add anything to head pressure. Like the difference in a drain. Take a 40g tank, and a 140g tank, both of same height. Drill a 1" hole and install a bulkhead in it. Think of the tank as the larger pipe. more volume, right. Which would have more pressure at the 1" bulkhead? Neither

I was kinda thinking backwards in my previous post. It doesnt matter how large the pipe is, the pump is only pushing put it's amount of water, regardless. When working on gravity, water falling down a pipe, then the PSI gains as the pipe narrows due to the velocity of the water, not just head pressure.. Principal behind Hydraulic strip mining