19-08-2021, 10:37 PM
I solved the problem by inserting a windscreen washer one-way valve into the pipe, a bit of sealant to hold it in place, allows air to enter but stops petrol & fumes from exiting, tank can be filled to the brim without it leaking, problem solved while maintaining its ability to breathe!
https://www.ebay.co.uk/itm/264540876656
https://www.ebay.co.uk/itm/264540876656