[cobrashoch]

Hal - I believe you are running a carb, right? Most cases a mechanical pump will keep up with a carb unless your running quads or a dominator with fat jets or something. The differance is measured on the high end when you "rev' er up" and keep it there. The bowls in the carb may start to go down and the engine will starve. In that case you can back up your mechanical with a electric pump. Also in that case I would wire it and plumb it so you can turn it off when running around on the street. I had a Hemi car till a couple of years ago that was set up that way. It too starved out on the big end and the electric pump cured it. There are several makes that are designed to just stick in line.
It had one of those noisey, click, click, click, click cheap Carters.
cobrashock