what are the signs that a fuel pump is getting weak? I know it runs off the vacuum of the engine, when my tank gets to about 1/3 it acts like it’s out of gas. even on reserve it won’t run without using the choke off and on. you can fill it up and it will start after you use the choke and crank it a while. almost like it’s just using gravity to flow it. would appreciate any help you can give.

thanks Don