Good luck! I seem to have something happen which sounds slightly similar, have twin tanks, been told maybe change over valve is allowing air in to the fuel system :/

Coil?

Done.

Hi No I haven't but it won't be long coz I'm at the end of my tether with this vehicle! Got a fueling issue ( i think ) now. Runs lovely on tick over, drives for about 40 mins and then starts farting about. Then breaks down! I'm fitting a fuel...