I haven't done enough runs to say for sure yet, but you may not need the pump at all - just a 1-way check valve in the pressure line. I was having a lot of trouble getting my 1.60 with a Cline regulator cranked the first run of the day. Just for kicks, I removed the regulator, but left the check valve in. Needle settings were almost identical, and no problems with fuel flow. I didn't get to fly it long like that as I started getting radio glitches and cut the flight short. But, at first glance, it seems to work like a champ.

I have the check valve in line with the tank pressure line, which is driven from the crankcase pressure tap. If anyone else has done this, or has comments on it, I'd love to hear them....