You can remove the risk of under pressure petrol spraying out and also make the pipes a little easier to get off, by pressing the schrader valve on the end of the fuel rail in the engine bay while covering it with a rag. A little fuel will come out and the pressure on the system will be relieved. There is also a similar valve just in front of the fuel filter, but I'd leave it well alone as they often are so dirty and road-grime covered that they press open OK but never seal up again!
Another way is to remove the fuel pump relay and run the engine until it stalls out.
Chris...
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