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hissing from back of car

henstepper

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I took my car out of the garage, went to close the garage door and heard a hissing sound coming from the rear of the car. First time I have ever heard this sound. It lasted for about a minute then stopped. It sounded like air being let out of the tyre, but I checked the tyres no obvious signs of leakage. I went to the servo and tyre pressures were ok. I let the car sit then started the engine to see if it came back and didn't. What could have been the cause?
 

henstepper

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I would like to think it was that easy but it's coming from the fuel tank I have discovered. So that tells me it's excess air in the fuel tank and it letting it out. Now what i don't know if that is normal because I have never heard it before. Or if it's a loose fuel cap or blocked fuel pump. I will try by a new cap seeing thats the cheaper thing to try first
 

greenacc

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Just try unscrewing the cap before you start it. See if air gushes out. I think more likely a fuel pump / filter issue
 
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