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What causes the vacuum hose to collapse while engine is running?
Wiki User
∙ 12y ago
The pressure inside the vacuum hose is lower than the pressure outside the hose. If the hose is old and weakened, it'll fold up on itself. If the pressure difference is bigger than the hose is expected to be able to deal with(by some other reason) the hose will collapse too.
If someone has replaced a real vacuum hose with, say a fuel hose, that too can be a reason.
Wiki User
∙ 12y ago
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