Posted 5/4/2021 21:46 (#8987873 - in reply to #8987814) Subject: RE: John Deere 7820 losing prime
Fuel tank vent can be plugged. Easy to check. Can be a filter mount base. They have been known to have a small hairline crack. I did all this then found a check valve on the pump. If possible, get some clear hose and watch it for air bubbles. I was down the same road a couple years ago. Can be frustrating.