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pressure in fuel tank


Spatt

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It's to reduce fuel vapour emissions (along with carbon canisters). Most vehicles now run the tank at a negative pressure stop fuel vapour venting to atmosphere since the regulations were changed in 1998 (ish... I think).

 

That's interesting. I'd always just assumed it was because 70 odd litres of fuel had been sucked up and there's no air getting in to replace the liquid, until you open the filler cap that is, and it rushes in.

 

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