I was working the coker ground one night. One of my jobs is to put the stabilizer product pump back in service. I’m at closing the bleeds and pulling tags when I went to open the suction block valve. I got a spray of coker naphtha straight into the chest. I closed the valve in a stream of naphtha. I found out during pump maintenance that someone was GOING TO replace the suction pressure gauge, but only got as far as removing the supply tubing to the gauge which was aimed at me. The pump suction pressure was 250# of good old sour coker naphtha.