The parts diagram shows a check valve at the oil pump inlet, so oil shouldn't flow backwards.
While running mine in reverse it smokes just as much as running forward, I'm not sure if this is just residual oil, but again, I'll be pulling the pump to investigate.
While running mine in reverse it smokes just as much as running forward, I'm not sure if this is just residual oil, but again, I'll be pulling the pump to investigate.