Be careful if you're considering the Harbor Freight kit. First, the quality actually is pretty good. Second, there's a crummy selection of cap adapters. Like there's no specific adapter for the very common type found on most older US cars. They include a crappy universal type adapter which grips the fill neck with a funky adjustable claw thing that works poorly. I suspect the HF kit was not originally intended for the US market.
It's also way overpriced for what you get in the kit. I see other kits on ebay which look like they have the identical pump and alot more specific adapters for the same price. This is just from judging from the pictures, I don't have any direct experience with these kits.