[Fuel Tank Pressure '72 Spit 1300]

Thanks gents.  I'll explore the pipe out with a valve option.  All I need now is time.....

[Fuel Tank Pressure '72 Spit 1300]

Hi,

I've been experiencing a problem where on a long run, the car looses power and cuts out.  When I open the fuel filler cap there is a whoosh of either suction or pressure (not sure which as it's always somewhere scary) and I can then start up and drive normally.  Obviously this build up is preventing the fuel pump drawing fuel from the tank.  Is there a vacuum being created and would the breather be to blame?  My breather is on top of the tank next to the fuel pick up pipe and has a short length of rubber pipe on it with a plastic door lock button in it fixed in with a hose clip.  Not a factory standard...

Any help/ideas gratefully recieved.

Thanks

Bob.