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Hi, My 200 tdi has suddenly become hard to start if it hasn't run for a while. If it has just run it fires up straight away. When starting it will crank over and over and over then catch and stop then catch again, run very lumpily then start running normally with a blip of the throttle. There is always white smoke on start up which clears as it heats up. Once running it is fine, there is plenty of power and I can't detect any issues. No hunting, surging etc etc. My plugs are only a few years old but I haven't taken them out to test on the bench. I'm getting 10v at each one My battery is at 12.5v Earth strap is fine (tested with jump cable from battery negative to chassis and also engine) Starter isn't sluggish and spins at normal speed New fuel filter fitted New leak off pipes between injectors fitted (but not pipe back to FIP) FIP was replaced in 2011 Injectors have had no love since I bought the car (100K +) so that is on the list to do. Today I took out the fuel filter housing bleed screw and unplugged the FIP stop solenoid wire and cranked the engine over while watching it on a video camera. There was no fuel coming out of the bleed hole despite plenty of cranking. I then replaced the solenoid wire and tried again and there was instantly a gush of fuel from the bleed hole. Now. I'm not the brightest sandwich in the tool box but I'm pretty sure the lift pump is manual so I think the FIP solenoid wire has no bearing on the lift pump and this was a coincidence. Which means that fuel is possibly leaking back from the filter back to the tank and I had to crank it a lot to prime the line again. Based on the symptoms and bits and bobs I've played with. What tests should I try and what should I be looking at next? Many thanks.