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Author Topic: Petrol Filler Cap  (Read 2526 times)
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Ammy
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« on: August 13, 2012, 02:01:47 PM »

When I release the screwed filler cap on the petrol tank, I always get a "hissing" sound.  Not sure whether it's air coming out or going in. Comments please on whether  this is normal.   B.T.W  I have an aluminium tank. Ammy
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MattNoVAT
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« Reply #1 on: August 13, 2012, 03:32:08 PM »

Its likely that it's sucking air in when you unscrew the cap, as fuel is consumed it creates a slight vacuum inside the tank.
The hissing is it equalising.

I have seen some cars with a small hole drilled in the cap to stop vacuum building up.  Or you can check your fuel tank vent pipe is not blocked or kinked, I managed to compress my vent pipe and after driving 100 miles the vacuum drew the fuel back into the tank and the car didn't fancy starting for a while.
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droptop
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« Reply #2 on: August 22, 2012, 03:39:05 AM »

THAT'S why mine is difficult to start after a long journey, and I have the hissing!
Thanks Matt.
Problem solved without even having to ask Grin
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Ammy
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« Reply #3 on: August 22, 2012, 09:09:15 AM »

Rather than drill the filler cap,  I decided to drill a small hole in the breather hose to the filler neck and insert a piece of "washer pipe" which then follows the overflow pipe through the bottom of the rear wing.  Same result.
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