When driving normally the engine can abruptly cut out. The dash warning lights come on. The engine cannot be restarted immediately, but after standing for 10 minutes or so, it will restart and then drives normally. The interval between these incidents may be weeks. Can happen at any roadspeed. At one such event some simple tests were done. Ignition sparks were ok. Battery was ok. Engine warm. Fuel in the tank. Injectors ok because engine runs normally and smoothly when it does restart. No smell of petrol underbonnet or anywhere after cranking without starting. My impression is of no fuel reaching injectors, or no activation pulses. Suspects: Fuel pump, Injector control unit, Loose cable, Ignition switch. What is going on in the 10 mins when it refuses to start ? If it stops again, what tests could I do at the side of the road to narrow the problem ? Mercedes 190E, Year:1990, 2 litre petrol. Automatic. Please note the car is my friends and not nearby, but I can check things at the weekend.