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Fuel pressure problems

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Uncleben:
Hi, hope everyone had a good christmas.
I've been having fuel cuts when driving, to the point where the car is now undriveable.
I have 2 codes, P310c 'low fuel pressure regulation: fuel pressure breaks down sporadically' and P1063 'fuel pressure regulation value below lower control limit'
It seems these are related to the low pressure side of the system, so far I have changed the lift pump, the pump control module, the low pressure valve on the hpfp and the fuel filter, none of which have fixed the issue.
I now suspect the hpfp (well, the valve on the top N276?) even though I don't have any of the codes that would be associated with that, such as P0087 and P2293, but don't see what else it could be, cam follower was replaced about 25k ago.
Has anyone had similar problems, and does anyone have a good hpfp for sale?
Car is 2005 AWX engine, located Worcestershire

pudding:
Might be worth checking the HPFP follower again as 25K is a fair old stint for one of those, especially if the car is remapped and/or has upgraded internals.

Have a good sniff around in the engine bay of obvious leaks, and how does the engine start from cold? Quickly and smoothly?

Uncleben:
Car starts and idles fine, when you rev it or apply throttle to drive it just dies, but will fire back up no problem.
Think I will remove the hpfp to check the follower just to rule it out  :happy2:

Uncleben:
Forgot to add, the car is completely standard.

pudding:
OK, maybe it's time to get the big guns out - VCDS, if you have it?  You need to measure the fuel pressures with the engine running and also under load to see which pump is getting a bit long in the tooth.

The in-tank pump should deliver between 3.5 - 6 bar when driving and the high pressure pump should be at 50 bar at idle, and rising up to 109.9 bar under full load.

Are you Uncle Ben as in the chap who makes the microwave rice packets?  :grin:

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