Thanks for the manual and the tips, they are great resources.
I removed the fuel pump diaphragm to see the gauze filter only had a couple of specs in it, cleaned them out anyway but didn't seem like it was the issue.
I took the cover with the 4 screws off to get into the metering area and the metering diaphragm seemed to have a tiny tear in it. Hard to tell as it was quite rigid and hard to pull away from the metal surface. I assume this is meant to be air tight?
I put it all back together and tried to start it and i've definetly got an air leak somewhere still. I can see bits of fuel coming up the fuel hose but there's still air getting in somewhere so no suction.
Should I replace the metering diaphragm? Should I do the fuel pump diaphragm while I'm at it? Where else am I likely to be getting an air leak?
cheers