Surely they should be on J.I.T. and not stockpiling tank senders.
Suppliers might not be willing to do JIT for the small volumes that MMC operate to. Elsewhere there is a current thread that gives 2014 M3W production as 300 a year/25 a month/roughly 1 per working day, so it would only be economic for suppliers to do batch deliveries.
Stuart "There's no skill substitute like cubic inches."