Quote:
Originally Posted by dieselbenz1
By filling the tank with used engine oil those vapours are the concern even after the tank is emptied vapours exist perhaps you vent the tank for months between using which would be less of a concern but you do extract all the vapours through that pump.
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At first I thought you were worried about engine oil exploding, you said no, that you were worried about refrigerant. Since there is no refrigerant, now you are back to worrying about engine oil fumes exploding? There is no oil fumes in the tank or in the vacuum pump. If there were oil fumes, the clear 1/8 nylon vacuum line would be all black. It is nice and clear. Even if there were oil fumes, it would not explode. Don't worry!