I had a long think about the future of my breather tanks when I had the front wheel-arches replaced in March on our Scooby. I was worried about putting them back in as they were such a corrosion trap so did not refit them. Instead I've got lovely clean wheelarches that are easy to hose out every now and again.
What I did with the 2 flexy hoses going to the bottom of each expansion tank was connect them to a 'Y' connector and then fitted a longer flexy hose to the remaining hole on 'Y' connector. I then guided this hose up into the inner of the wheelarch above the metal fuel-tank. This simply vents to atmosphere to allow for expansion and contraction of fuel in main tank. I shrouded the end of this vent tube (with a long grommet) and ensured it was pointing away from the wheel and downwards to prevent any dirt getting in. I found a p clip was the best way to secure this hose.
For info the top of the expansion tank has a vent tube coming from it which goes to the very same area I now have my 'new' vent so no lines have been blocked off and refuelling to max is no problem.
You must run your vent line high in the wheelarch so it's high point is ABOVE the filler point or you could vent liquid fuel and not just vapour if/when you brim it!
I've had absolutely no probs running like this and we brim it. I understand the points about cold bunkered fuel expanding when it warms up so I'll watch it if I ever fill up on a very hot day (hope we get some
)If it does vent liquid fuel in that situation I just won't fill it all the way but like I said we've had no leaks
Hope this helps in your decisions!
