200tdi pressure in the fuel tank? - Defender Source
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Old October 28th, 2013, 07:39 PM
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200tdi pressure in the fuel tank?

Just wondering how much pressure should there be in a fuel tank? I switched to a newer style fuel filler and cap, with a passenger side fuel tank an have a load of pressure that builds up in the fuel tank. I had the cap tight and started the engine and the pressure built right up and when I opened the cap there was pressure and even had some mist/vapor.
Is this normal, and I guess I have to find a way to vent the tank.
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  #2  
Old October 28th, 2013, 07:54 PM
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well the tank breather should have a check valve to only allow ambient air into the tank (without a check valve the breather will leak in a rollover...bad). To build up pressure in the tank (from thermal expansion and such) is usually the cap itself (kind of like a coolant pressure cap). If you are building up pressure, you have the wrong cap. you are talking positive pressure, and not vacuum pressure, correct?
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Old October 28th, 2013, 08:00 PM
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Positive pressure
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Old October 28th, 2013, 10:01 PM
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Robert Davis
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Are you running 1 or 2 fuel tanks?
If so is it possible you are drawing fuel from 1 tank and returning it to a different tank?

The only other thing I can think of that would cause it would be to fill up when it's cold and remove the cap later when it has warmed up outside.
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Old October 28th, 2013, 10:36 PM
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Put old style cap on. Does that solve the problem?
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