Quote:
Originally Posted by ah-kay
I really do not know whether it is sucking air in or pushing warm air out but it seems to be happening in the SDLs and 300D. If the vent tube is OK then the tank should be at atmospheric pressure, there should be no hissing sound. Am I correct?
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As oldiesel correctly stated above, the tank vent system incorporates a relief valve which actuates at a slight pressure differential, both positive and negative. That means that some degree of pressure differential is perfectly normal.
Quote:
Originally Posted by ah-kay
There are 2 ways I can try:
1) Connect compressed air into the tank from the fuel line and see it stays pressurized - It would not pressurize if the vent tube is OK.
2) Get spare cap, drill a hole, hook it up a MityVac and drive the car around. If it shows a vacuum then the tube is blocked.
Would any of these 2 methods work?
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It would be much easier to remove the relief valve from the vent line and test it. With the valve removed, you could also verify that the line itself is clear.