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Vt 5ltr Fuel Tank Sucking in

Mr&Mrs5ltr

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Hers: Vt 5ltr calais & His: Vn 5ltr Group A Rep
Hey, anyone know what makes a fuel tank suck in? Its got a brand new charcoal filter and fuel pump in it but for some teason the rank will suck in air? Mr 5ltr has drilled a hole in a spare fuel cap and it hasnt done it since i just dont want to drive around with a hole in my fuel cap. Haha any help would be great even a link to read about it, we cant find anything on it. Mechanic said charcoal filter and it didnt change it.
 

VK SL 3800

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The Cap is meant to have a release valve for both vacuum and over pressure so its probably just the cap. Pretty sure the rest is a sealed system.
 
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