Fuel troubles

Use compress air and make sure supplies and return lines are all clear. Then place a transpant hose on carb inlet. Crank and watch the fuel move into the carb. Also place a fuel pressure gage between pump and carb. If u are not get over 3.5 -5 psi or see bubble into the carb. Ur pump is junk. And please be specific when u say cpts that are chk out. What method did u use.A visual chk out is not 100% positive. Wehave more customers or even shop swear theyhave good cpts or chk out and it turn out otherwise after we went 1000 miles of circle. Iif u wanna eliminate the possiblity of bad tankor junk in the tank. Then just use a can of gas and a siphon hose to the pum and see if ur engine will start. God luck man