Why not just have a thin line plumbed into the cap or a small hole in the cap to allow it to suck in the air it needs to stop it from collapsing?
Couls you not drill a very small hole in the boot floor to run a vent pipe through (In the spare wheel well), Dave?
AH, i thought this was for your screen wash tank for screen wash not WMIThe cap has a small hole in it - with a screw in plug. When the plug is screwed out - and the meth isn't running, the wmi is potentially fuming and rotting my brain (even more)
Yes, but then I'd have a fixed line attached to the tank. The fuel line has a quick release fitting. Now, you're going to say 'buy another one'. But I may have a one-way valve in amongst all the N112/249 pipework I ditched. Can't I try that?
Dave returns from loft clutching plastic one-way valve from ditched emissions pipework. (there are at least 3). It looks as though the tail from it will fit the cap vent hole sleeved with a bit of vac pipe.
You're like Robbie's evil twin...
See you tomorrow dave.
I'll be the perplexed guy peering into a Leon engine compartment.......
Did you manage to get the WMI working in time for the track, Dave?