P30 Fuel Pump Service Life?

I just went through this exercise with a 1996 P 30, thinking fuel pump is bad . there is a way to test fuel pump thru the fuel pump relay to determine if fuel pump is bad. you can check the fuel pump ground and bypass the relay to see if pump runs using a small jumper and a volt ohm meter to check things out.I also was thinking of cutting hole in floor but H2o tank was in the way. It turned out it was a bad fuel pump relay. I do believe in P M but like others have said where do you draw the line. Oh yeah the relays on the 96 p 30 are on top of the steering column in the dash of mo ho, I looked forever to find them. You may also look under coach to make sure nothing is in the way to drop tank. My levelers had a steel brace going across underside of fuel tank from one jack to the other that was in the way of tank coming straight down but I think tank could be dropped enough and lowered on one end to maybe get it out . Read my post " chevy gear heads" it cover some of the issues about the fuel pump.