Thread: How to tell tank vent tube is blocked?
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Old 12-02-2009, 12:05 AM
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tankowner tankowner is offline
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Join Date: Dec 2007
Location: Columbia, MO
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Quote:
Originally Posted by ah-kay View Post
It seems that every time I open the 'diesel' cap to the tank I hear an inrush of air. What is causing that, a blocked vent tube? If I do nothing, would the tank collapse due to vacuum when I run the tank dry/very low?

Your advice is appreciated.
Are you sure it is vacuum pulling air in, or is it pressure pushing air out? The only reason I ask is because my '95 does the same thing, for a long time I thought it was sucking air in, that is, until it got worse and I could feel it blowing the fuel cap off when I twisted it to remove it. Also, the pressure began pushing fuel past the cap. Anyway, it could be either and sometimes it is difficult to tell.
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'95 E300D ("Tank") - 231,000 miles
'79 240D ("Biscuit") - 197,250 miles (Sold)
'83 240D ("Ding-Ding") - 217,000 miles (Death by deer)
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