Slight loss of power after driving for an hour

[lazy]

I've only had this happen two or three times but it just feels like there's a very slight loss of power after driving for about an hour. Once you park up and come back to it it's back to normal. There's no fault codes so no obvious indication of anything wrong. If anyone can shed some light on this would be great.

[ZoliWorks]

Check fuel pressure on both sides. This is just a hunch but maybe your in-tank fuel pump control module or the pump itself are on their way out