The Mk5 Golf does not have a power up relay internally. The power up relay and fuel pump relay is situated in E-Box underneath bonnet. I traced the fault to a broken crank wire below the E-Box which controls the crank feed to energise the pre-pump and to then run the fuel pump. This fault has been very intermittent & the wire has slowly becoming corroded. What has caused this I am unsure. The relay part No 1K7 B04 3043. B+ is the crank feed. Thanks for your help.