Years ago I went to do some circuits in a Cherokee 235 (similar engine). The standard procedure was to leave the fuel tanks selected on, or to the fuller tank. I omitted to check the fuel selector as part of the normal start checklist, because I had become so used to this. Unknown to me, the tank selector was awaiting repair, as it had developed a leak, which manifested as a steady drip under the fuse, hence the temporary procedure of leaving it turned off after use.
Started, taxied out, did a run up, then when backtracking for takeoff the engine coughed a few times and died. Worked out the problem (fuel pressure gauge gave it away) and restarted normally, double checked the stuff I should have checked earlier, and proceeded with flight.
If I hadn't done a run up, it would probably have failed half way through the takeoff run, the point being that the carb float bowl on the 0_540 holds rather a lot of fuel. Lesson learned!