by Steve J » Sat Jun 02, 2018 10:48 am
Breather hole? That reminds me - almost all LDs have the usual breather hole in the filler cap, but some of the late Mk3s have a separate metal vent tube that runs down inside the tank and exits underneath. Those have a filler cap with no vent hole - just make sure your tank is the type with the separate breather if you have no vent hole in the filler cap!
If that's not the problem, it might be worth checking the HT coil, these can give an intermittent fault when they get hot, but seem to work OK once they've cooled down. Similar problem can occur with the condenser - just because it's new doesn't mean it's not faulty!