I have thought of this,and I do a lot of fuel pumps replacements too
I had a guy swap his fuel pump in his S10 a few days ago.I went to town,and came back to find him sitting there beside an open tank,with the sending unit in his hand,removing the fuel pump.WITH A CIGARETTE IN HIS MOUTH!
I took that thing away from him,and put the pump together,back in the tank,and told him to go smoke,and then come over and finish up.I mean I was nice enough to loan him the tools,and place to work,he couild have used some sense