Hi - looking for advice for storing remote petrol tank on folkboat. Couple of options - disconnected, vent sealed in cabin (which still leaves fumes, prob from fuel left in line), or in cockpit seat locker which is small, not vented per best practice, and will I imagine get very hot in summer. Don't really want to cart back and forward to house via dinghy etc.. Any suggestions? Aft end of cockpit locker is transom, so potential to drill hole for vent, also would allow for fuel line access to motor. With no vent at forward end, vent may be relatively useless however.

I keep my petrol fuel containers in a plastic box that only has the top as an opening.

The box is stored in the rear of the cockpit.

Any fuel spill will evaporate and not end up in the cockpit or god help us the bilge.

Ideally you should take the tank home and keep in a cool place. Fuel tanks (petrol) have a vent which is normally closed when not in use, but some fumes still escape. If it is plastic then the fumes get through the plastic. If the tank is in a sealed locker it will be rather unpleasant, and potentially dangerous. Better to vent the locker to atmosphere.

The next problem is that what evaporates is the "light"ends of the fuel, the stuff that helps starting. So old fuel is not good. You can get fuel preservative which reduces the problem, but it is better to always use fresh fuel when possible. Takes us back to taking the tank home.