update,
Near emptied fuel tank, it looks clear, even shook tank while emptying.
thought I'd check the 'jets' looks like the middle jet was blocked! I didn't clean this one yesterday. (don't know why I didn't bother with this one)
I've just cleaned all jets and put it all back together, it started, instantly.
Just need to know where the dirt is coming from.
Son is off to refuel now, hope he gets there n back.