My first Cam Follower failed with Auto Tech pump, Stage 2+, on track at Snetterton, my own fault as it was never changed and done quite a few track days
Unfortunately a year and a few track days later the second one failed, this time with an APR Pump
Both times needed engine strip down (by KPM Racing) they change their race cars cam followers after every race weekend, for the sake of £25 and an hours work I'll be changing mine after every track day next year
p.s. don't open the car door with the pump off, it will prime it.