If it is like my 2 4000's it doesn't have a primer. I had one fuel line get plugged up before the filters - blew it back with an air compressor - probably blew the screen off in the tank - don't know, don't care - it has run fine for 2 years since. I have also wiped the filler off and blown into the tank until fuel went through the filters. That probably isn't the right thing to do either but it worked.