I had this problem recently. For my car the problem was a leaky valve on the common rail fuel feed. The Honda dealer diagnosed the fault, then quoted £1200.00 for the replacement part, but I found a diesel specialist in Tonbridge who reconditioned the existing rail (inc removing and refitting it) for £180.00 inc VAT.
I found them on E-bay by typing 'FRV fuel rail' in the search box
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