I guess I will find out myself, so far it wont pump fuel over 9'' high the way it sits. I'm under the impression these pumps do better at pulling rather than pushing, and that's why most are mounted on the engine or close to the carb. This is a bit off topic, but I'm working on an old 1979 Wheel Horse lawn tractor with a 12 HP Kohler cast iron engine. The original fuel pump was mechanical and took a dump. A replacement is about $150.00. I robbed a pulse pump from a 11 hp Kuboto vertical shaft mower, and pulsed it from the dipstick tube on the Kohler. The pump is mounted on the firewall, which is about halfway between the tank and the carb. The gas tank is in the rear, and the bottom of the petcock is 13" below the fuel inlet on the carb. There is about 30" of fuel line on both sides of the pump.
Once I get it primed to the carb it will fire right up. The problem is when under a load, the fuel pressure isn't sufficient enough. It's like it has enough pressure to keep a siphon going until the fuel rate exceeds it.
I'm going to try mounting the pump closer to the carb. Presently it is trying to push fuel over 30" of line and up 13".