I'm struggling to get the engine started, I have picked up a working used fuel pump and bench tested it to be ok, I can get it running when I remove the inlet from the fuel pump and pipe it directly to a small tank above the engine but when I reconnect the line to the tank it stops running, could this be another faulty pump even though it works on the bench? I can pull fuel from the tank via the feed with a suction pump and have topped up the fuel so it's showing 1/4 tank.
I've never worked on the this type of engine before so I'm a little stuck.