ON STOCK tanks, i always drill a hole on the bottom towards the back, and thread in a brass bushing. (3/8 internal threads whatever external) I then solder this in. Screw in a nice AN fitting 3/8 X -8 or etc, Use that as the feed your your pump. Works very well . Your fighting a lot of gravity with the stock pick up and the faster you go, the harder it is to pull the fuel up that pickup.