alright chaps,
been trying to pin down some of my weird problems with the RB2xDETT thing.
I've put a fuel pressure gauge in between the filter and the rail to see what the fuel pressure is like and it's fine, when the pump is running - just over 3bar before starting the engine and 2.5bar at idle, vac hose off, it returns to just over 3bar. (rb25det is definitely a 3bar regulator - like the SR20)
the thing I noticed is that the pressure drops fairly quickly when either the fuel pump stops priming or the engine stops running - some times it was within 30 seconds, some times within 10-15 minutes but it was a total loss of pressure.
I've not got any leaks (or any I can see), the injectors have been tested off the car so I know they hold pressure.
I took the return line off from the FPR and after the initial flow stops, there's a slow drop (maybe once every 10 seconds or so?) but don't think this would be enough to drop the amount of pressure involved.
would this suggest a bad check valve on the feed under the car? (or is it possible the fuel pump isn't quite right?) both have been dry for a couple of years - but stored inside.
any ideas before I start throwing money at it would be lovely.
cheers
alan