Tried a Sytec one way valve, but still a ton of cranking needed if left for a few weeks. I think the issue may be fuel evaporation rather than drain back (possibly exacerbated by being outside all year) - it seems to be a fairly common problem with the 32/36DGV and modern fuels (having read other car forums that also use that carb - however the usual caveat that a lot of internet stuff is sh1te).

The best option is to use her more often, but in the meantime the pump solves the problem.

I had fitted an electric pump which solved the starting problems, but that produced other issues so I've gone back to a good mechanical one.

"Y mae dafad ddu ym mhob praidd"
1972 4/4, 1981 MGBGT, 1984 FLHT1340, 1980 XLH1000, 1990 ZX10