Mk1 golf 1600 GTi fuel tank

hello i have taken all of the pipes going to the fuel tank off my mk1 golf gti 1.6 1981 as i have a fuel leak. I have discovered it is a total bodge so i need to put it back together properly. i don't have a gravity valve. does any one know where i can get one from and where do all the pipes go to on the tank?

If any one has any pictures that would be really helpful.

cheers Alex

if any one has any pictures of how they're fuel system is layed out under the car that would be helpful too

does nobody have a fuel tank??