Simon
The reserve luboil pump can be drained to the luboil storage tanks ( when bunkering luboil) as indicated on the below system sketch. In that case the cocks "k" act as sniffers e.g. letting air into the pump for easy drainage, I guess the drain would go OK by gravity. As a fueltransfer pump however I believe the fuel in the pump is drained via the two "k"s to the fuel collectiontank. In both modes the "k" pipes would go into the funnel you have indicated. The pipes from the funnel would end up in the fuel collecting tank. I don`t think there is a connection to the handpump. As to the luboil mainfilters I am in doubt, anyhow they should not be hooked up with the drainpipes from the "k" funnel as a filterdrain would probably be to low for gravity drain. I should leave a possible filterdrain at this point.
Tore