Yeah thats normal mate. As the fuel is sucked out it creates a vacuum as it's trying to draw in air. As the tank is sealed the air cant be sucked in. Hence the whoosh of the pressure being equalised when u open the filler cap 8)
Nope doesnt affect the fuel at all. If you look under parts suppliers you'll see purple monster si selling Warlbro fuel pumps. I'd go for one of them over the bosch. Just my personal preferance tho
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