Help required for repairing CNG car in Poland

[darius_p]

Hi guys,

I have a 2007 volvo bi-fuel (CNG) car and the problem is that the valve in the gas tank doesn't hold the gas well, it continuously letting it to the system at small amount. I am at the moment in Poland, and I see that CNG cars are popular here, thus would like to find who could repair mine. I tried to email few CNG shops regarding parts, but didn't get any response.
Could you please provide me some contacts of repair shop or individual that could repair this issue, by replacing valve or tank or ... I don't know much what could be done in this case else.
At the moment I am close to Bydgoszcz, but it would fit anywhere in Poland.

thanks in advance