pressurised fuel line does it influence performance
should the cav turbo fuel lines, rail etc always be pressurised as the bosch 053 pump has a one way valve to which a banjo fits if this is replced such that there is no on way valve would this affec the performance on a turbo.
would the pump have to work harder to maintain 4.5 bar fuel presure.
If the fuel lines are not pressurised after the new fuel pump, I'd ask for a refund.
On similar lines, if the pressure doesn't change when the new adjustable FPR is installed (and adjusted), I'd too go for a refund.
After the engine is switched off (If that's what you're asking) the pressurisation goes off after an hour or two