I have a carbed 22r in my 87 PU. Over the last few weeks the fuel pump seems to lose its prime or something. If it sits more than a day its is a bear to get started. I could sit there all day and crank till the battery dies. If I pump the throttle it wont run but if I leave the throttle closed it will catch and run rough until I try to give it some gas and then it just dies. If I blow the fuel line out with air and dump a little fuel in to the top of the carb it will fire right up and run fine till it sits about a day.The filter and pump are brand new and the carb has a recent rebuild. Motor is also a new rebuild. Less than 5k