DHSE wont accelerate

My wife was out in theDHSE the other day and after pulling away from the lights said it would not accelerate ,foot to the floor and nothing then after creeping along for a few hundred yards power came back and all OK. Have checked leak off pipes OK Battery leads OK,No burnt fuses.Been using it myself now and no probs at all for 220 miles.But just near the set of lights is a huge new phone mast,Seems funny as the engine would not rev up then power came back as if accelerating normally.Any ideas,.

In tank pump, bacterial growth in the fuel tank, blocked fuel filter for starters.

Thanks for the reply have been out in it again 2 hrs running around ran well.Have changed the fuel filter as well today.I cut the old one open clean inside If not fuel could it be electrical like some sensor perhaps Thanks,.

Check the connections to number four injector. And the multi plug to FIP.