My 646 loader with a CCK Onan quit on me two weeks ago. Electric fuel pump quit pumping, not the first one to do that. I tired to install a cam operated fuel pump from a donor CCK and couldn't get it to pump either. So I ordered a pulse pump which I installed this morning and it's running fine. I utilized a plugged fitting in the dipstick tube and installed a nipple for the pulse hose. Then mounted the pump above the fitting with fuel lines running into and out of the pump. I hope this one gives me years of good service. Sometimes tinkering with these GT's can be a PITA but it's so rewarding when they are running fine.