Q:
Is it necessary to flush the sampler before and after sampling?

A:
Yes it is necessary. Before sampling you must flush with the product you are bunkering to ensure the sample is a true sample of the product. After bunkering it is necessary to flush wih diesel or gas oil, else the product can stiffen inside.

Q:

Will  the fuel sampler stop automatic when the sampling is finished?

A:

Yes all the fuel sampler are automatic and they will stop when the sampling is finished.