I've checked FUC 03. The pictures seem to suggest the MK 1 had the tank pictured in Riche's post, two vents a filler cap and a fuel pick up. The MK 2 picture has vents in the same style as the MK 1 but with an extra fitting towards the middle of the tank. This I assume is the pressure valve!! Don't know how a pressurised system works if it's vented? Or if the cap has a valve what the extra fitting is? the part isn't labelled.
Ben
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