The 3 small breather tubes are for sending the fumes to the charcoal canister under the bonnet. Inside the rear guard is a tank with space for some liquid fuel in case of splash or expansion. If you don't connect it your vehicle should run just fine but it will be illegal as far as emissions are concerned. There will have to be another breather connection though or you will generate a vacuum in the tank as you use up fuel.
Also make sure your donor tank is an EFI tank with provision for the fuel pump assembly in the top middle. Carby tanks are very similar looking except for the lack of pump orifice.


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