Help needed again.......Checked my oil pressure today to find only 2 bar oil pressure when cold at 4000rpm so not very good at all . Turning out to be a never ending project. Gonna have to get the sump off this weekend and have a look at the oil pump. Could anything else cause low oil pressure? Bit worried as it has had a bottom end engine rebuild costing £500 and new valves etc. When I blow through the banjo bolt hole in the block I get no pressure build up. You can hear the air blowing out the filler cap/ breather system. Could it be the oil pressure valve stuck open in the pump? or something else. The last thing I want to do is buy a new pump and find it has something else causing it