Fuel tank

[John66]

Hi can anyone please help me on something my fuel tank is sucking in on my zafira mk1 and I have to pull over to release the pressure as I have full tank yet few miles up road sucks in making my sender unit say half or empty 

[Vauxhall Owners Club]

It sounds like the fuel cap is no longer venting.
Perhaps the wrong one is fitted or the vapour vent/recirculating system is blocked.

Has any new parts been fitted since before this issue started?

[John66]

Yes the just the perge valve and charcoal Canister 

[John66]

4 minutes ago, John66 said:

Yes the just the perge valve and charcoal Canister 

Also I'm looking to put fuel pressure gauge on but not sure on what the fuel rail threads are to get a adapter so I can keep an eye on it as the fuel pump is in the tank I would like it to be outside of the tank for easy access but not sure if it will be possible