Possible pump problem!

[Dave]

Have to wonder why its loosing pump pressure, it wouldn't have seized, but could have a piece of shit in it causing vanes to not seal, or worse could have scored the body. The only thing that makes me suggest its pump is that you say your turbo sounds fine though, so get your hand down the back and check your turbo isn't seized or anything stupid, then go from there. Where is your fuel filter located? has it been changed recently? any tiny piece of foreign body between the vane and pump body will cause pump pressure to drop silly amount, but still maintain fuel input so will still run.