Well after months of living with the hesitation and trying different things to fix it , finally I fitted the second hand fuel fump this morning and it is cured! I now have my car with full power and don't have to plan every overtake very carefully , it just goes when asked.I have still to check the fuel pressure again to see the difference from the old pump ( which held just under 3 bars) but was not enough to cope on snap throttle openings or on full boost. I could drive through it on a light throttle with no real urge then give it full throttle at about 4k and it would go ok but not like it does now. It also affected the fuel consumption on the trip computer ,due to I think the increased pulse duration to keep the mixture ok. Hopefully this pump will last until find a new one. The car has done 153k now so I suppose it is to be expected, shame it didn't just stop all those months ago ,would have made fault finding much easier!I have my car back as I remember it and a smile to go with it, Happy doesn't really do it justice!

Dave

I assume the car was generating lots of low fuel pressure errorcodes ?

I assume the car was generating lots of low fuel pressure errorcodes ?

There is no pressure monitoring so the ECU has no idea! would have saved me lots of time and buying a fuel pressure tester if it had!