warm start problems

[bigdaves12]

So I managed to sort out the timing etc, runs fine but now I've started driving it I've realised when I turn it off warm and start it up around 15 mins later it starts then cuts out like there's no fuel. I primed the fuel a few times and it sometimes works, earlier it failed to start at all. Left it a few hours and did some diy around the house, went back and it started up first time on one prime of fuel. Any ideas?

It also cuts out for a few seconds whilst driving then fires back up when rolling, it's an auto btw

Maf is 100%- I checked it before reassembly