Car has been 9.60s so far, running a pair of T3/T4 58mm Ebay turbos, self modified Demon carb with homebrewed BRPV on the primaries, AFRs running high 9s to low 10s on gas scale WOT, BG400 pump, -12 cell to pump, Allstar -10 10" filter, -10 to Aeromotive 13202 regulator, 2 -8s to carb bowls. I've had leanouts a few times, the first one was caused by the pump bypass, which has now been blocked off. Next time, it was the -10 Summit fuel filter, replaced by the comparatively HUGE Allstar filter. Next time out, it leaned out BAD, broke a piston and cylinder wall. Putting together a cheap get-me-by motor for now, till I can build another good motor, but don't want to run it again till I figure out a FAIL-SAFE solution for this fuel problem. Boost so far has been about 16 psi, backpressure 20-22 psi. Do I need a different pump??