Bristol 603 - compartment drainage
 

A recent 2 hour trip in heavy rain resulted in a wet carpet in the boot, mainly on the near side. It would appear the water was coming down rather than up. Removal of the carpets etc. should 2 pipes clipped to the wing which exit behind the rear wheel with one only on the offside. I assumed one came from the petrol filler compartment and the other from the cabin air exhaust space. Previously I had noticed drainage from the petrol filler comp. dripping from under the rear wing but on this occasion I find the drain to be blocked so I need to explore further. Removal of the grill of the cabin air exhaust space revealed no drain from that space, surprising because a car wash or enthusiastic use of a hose must lead to water entering this space.
So what is the purpose of the second drain pipe? I thought it might be an air release from the top of the fuel tank but there is no such fitting so what is the purpose of these drain pipes, one each side of the rear wheel? A search wire went a long way up it.

Peter,
On my 603 the vent for the tank comes into the boot on the passengers side and exits through the boot floor. From memory the second pipe on that side is a drain to the filler compartment but I will check the car later. Also to see if there is a pipe on the drivers side. You can see the tank vent pipe in the photo of your petrol tank.
Geoff.

Update,
Having looked at the two 603's on WLO the only pipe going through the boot is the vent for the tank. On 4981 H the trim is back in place and with a bad back I cant for the time being remove it but last winter when we did some minor boot floor repairs we encountered two pipes the larger being the tank vent, the smaller rubber pipe was a drain for the petrol filler compartment, as the drain hole in that area is in the front corner I would have expected the drain pipe to run down the front of the wheel arch but on 4981H it went through the boot. Indeed I think we had to replace a section of it as the rubber had gone hard and split. Sorry I can't be more help.