oil goes from the pump to the filter the to rest of engine my quess is there something wrong in the oil pump. what is oil pressure? is it high? I also like Denny's idea of double gasket. As for the bypass it rarly goes bad and besides it is for your oil filter if it should become clogged if this happens the valve opens and you engine will continue to oil what regulates the oil pressusere is the bypass spring in the oil pump.