Blake I guess I can take a stab at your question. Yes they do have pressure from the motor to move gas to the carb. The pressure two line tanks on OMC motors showed up on the 1949 QD 10 hp Johnson. Evinrude picked them in 1950 on their 14hp fastwin. They stayed around until 1958. The 58 lark and the Javelin had single line systems. I am sure I will be corrected if that is not so! OMC experimented with the single line tank on some gale models somewhere around 55 or56. You can use a pressure tank on a fuel pump motor if you make an adapter. Fisherman 6 has an adapter on some of his videos if you look for them on utube. Mercury had a pressure system also but I am not so sure of the years.
40 below Joe….who wants to play cards!
