A year or so ago I posted that I'd lost all oil pressure (whilst the car was parked- was fine on previous trip and no pressure next time I started it). I changed the oil pump rotor and primed with vaseline that time and it got oil pressure stright away and ran fine.
I recently lent the car to a friend for a few months and after several weeks driving she phoned to say that it needed oil and what oil to use, followed by another call to say that the oil pressure light was staying on.
I got the car back home and now I'm at square one again. No oil pressure, with no visible signs of disastrous engine damage etc. It starts fine, but with no oil pressure. I assume that the oil strainer is getting blocked. Is there any way of clearing it without lifting the engine to drop the sump? I have access to an air line - would it be possible to blow air down either the feed to the pump, or one of the pipes to the oil filter to clear the blockage, followed by emptying and flushing the sump oil?