Was taught and always use the 3/9 positions for bung holes also always carry water detecting paste or capsule (my cost) .As a further precaution, my hand fuel pump (McNaught) has a clear fuel bowl and paper cartridge filter to remove any impurities. If I get to a refuelling point and the drums have no seal or no dates on them, I do not use them.
Storing the drums upright is asking for trouble as the bottom will rust in no time including water leaking in throught the seals. Totally agree with storing empty drums upside down.
Great tip using the torch light will try that.
