Background info,it's my missus's car,a few months ago the engine management light started coming on and it started losing power,eventually it would'nt start.I had a guy plug in a diagnostic machine and he told me the lambda sensor next to the exhaust was faulty.took it to my mechanic who replaced the lambda sensor and serviced it,still wouldn't start,replaced fuel pump and fuel pump sensor still not starting.another diagnostic machine could find no fault,plenty fuel pressure going into engine good spark.it starts when we put fuel into air filter bay but conks out when fuel is used up.next thing to try is ecu unit,wont get one this weekend everyone on holiday.anyone had this problem all suggestions welcome.