BUNKER FUEL suppliers have warned of a possible shortage of supplies in Durban from today (March 1) as a result of a seven-day shut down at the Shell/BP refinery for maintenance and repair purposes. The refinery has been pumping as much as possible into the pipeline during the past week in an effort to offset any problems, but has made it clear that there is no guarantee that what will be available will be sufficient to meet all needs. The shutdown does not affect the Engen refinery which will be operating as normal during the same period.