I have a 1990 XJS 3.6 manual coupe owned from almost new with circa 77,000 miles. Bringing her back from winters slumber in heated, well ventilated garage in April had FF2 which is Fuel Fail alarm come up a couple of times. This was traced to corrosion on airflow meter earth stud cleaned and all was well. Two weeks ago when turning into local builders merchants car park it cut out. Coasted to a halt with dead battery. Evening before FF2 again came up but nothing detrimental was running fine and cleared on restart. Recovered car and charged battery overnight, couple of cranks when battery was failing so brand new battery fitted cranks fine but would not start. Starting checking with airflow meter first having seen fleetingly FF2 the evening before. Discovered that the multi wire lead had been chaffing as it was routed tightly beneath the meter against top of suspension unit. Two cores were exposed but not broken. Cleaned and separated them but again while the engine would crank car would not start. Disconnected air flow meter as it should start in limp mode but nothing. So checked for spark, none. Checked power to coil, all OK. Distributor cap and rotor all OK. Power fuse to ECU OK. So ignition amplifier or crankshaft sensor. Checked resistance on crankshaft sensor between red and blue lead 1.3kiloOhms as it should be so ordered and replaced ignition amplifier, cranks but still no spark. Suspecting crankshaft sensor in spite of correct resistance reading ordered and replaced crankshaft sensor, cranks but still no spark. Am now suspecting the ECU but thought I would enquire if anyone had any further thoughts. I also have a used but sound fuel tank for XJS V12 that I bought as a replacement but has different connections to 3.6 and also a repairable 3.6 fuel tank free of charge if anyone wishes to collect from Manchester.