Need to extend a fuel filler neck. The connection to the tank looks brass and is externally threaded. Can I join brass fittings for petrol fuel and would I need some sort of jointing compound or fuel safe stuff to go on threads before.
if the thread is BSP you should get something from a decent plumers failing that an hydraulic supplier they have large fittings for the fillers on oil tanks on hydraulic systems
or farm machinery suppliers
cheers
Plumbers putty (make sure it's safe for whatever fuel you're using - usually says on the container) is ideal. Avoid teflon tape. Many well stocked auto parts shops have fuel line sealant, which is, as far as I can tell, the same as plumbers putty for 3 times the cost.