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Mike with the normal tank connections the 2"(ish) filler hose goes straight to the tank. There is a 1/2" hose to vent the top of the tank back to the filler neck. This is to stop blow back as the tank reaches the full mark. Off the 1/2" hose there is a Tee with a 3/16"(?) vent hose that should return to the opposite side of the car and then vent down to the open air. Because its on the opposite side of the car there will be no liquid in the pipe only vapour. If the silicone hose is not petrol resistant, which is probably the case then that may be your answer but the vent pipes I've described should keep the air fresh.
The two 3/16" pipes you have seem unusual but if you connect them together and run them to the opposite side of the car again and under the scuttle before venting to fresh air, I expect that to work also.
Clive
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