Daimler V8 250 Petrol smell

Hello everyone, my first post. I’ve got a 1967 Daimler V8 250. There are things that need sorting out that I’ll get to in time - but the first one to sort out is that there’s a strong smell of petrol when driving. I looked at the fuel pump in the boot/trunk, as there was a petrol smell for sure back there - and indeed there was an obvious leak - on inspection the plastic casing had some damage, and the gasket screws needed tightening. I’ve ordered a new fuel pump anyway, but as a temporary fix I sealed the damaged area just in case and obviously I tightened the screws. There’s no leak anymore. I removed the carpets to clean and air them, and cleaned the boot/trunk out. There’s still a strong smell of petrol when driving - but I can’t see any obvious leaks under the bonnet/hood. When the car has been parked there’s no fuel-smelling liquid underneath. Any ideas/suggestions?! Thanks all.