I just had a race with the Group A BMW. After fuel calculations, I needed ~37L of fuel for a race. I put in 42L as I don't like being the guy who died on the penultimate lap. Aaaaanyway, fast forward to lap 3 of the race, crew chief tells me I need to come in for fuel before race end I look down at my fuel gauge, seeing I am already down to 14L with. I continue on expecting to be down to 4L by lap 4, but no, it hangs at 12.5. Next lap is 10.2. The question lies in the title, are fuel leaks a mech fail?