i`m not worried about the boss – whats the van like? 8)
petrol smells –
possibles-
fuel tank breather pipes
fuel feed lines (especially if that are externally braided as you cant see how shot they are – basically get normal fuel lines asap i had petrol spewing all over my engine once which was super scary – i knocked a braided line accidentally!)
running a bit rich – carb needs a tune.
spark pulgs/timing out – not burning efficiently (does it run ok? or a bit ‘lumpy’? ) is it sluggish – well, ok, even more sluggish than you think it ought to be!
it all depends on where the smell is and how bad it is. backfires and flames from the exhaust on overrun are not uncommon!
on what sort of engine/carb(s)? i`ve not much experience of dual carbs but its supposed to be better but more faff to set up.
glad the shifter prob is sorted – its v-frustrating.
best thing i did on my van was fit a pertronics electronic points kit. saves all the pissing about with the points in the distributer cap which i found nearly impossible to set right. it was a joy after that and ran so much better as its amazing how much bad point adjustment affected the running of the engine.