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Overnight fuel drain back to tank


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Hi Guys

Has anyone any knowledge or can offer help to my problem my 2008 X/Type 2.2 diesel se has started playing up not starting, I at first thought it was glow plug orientated and have been activating them twice and it starts on the button then so I have plans to change them although I did about 18 months ago and done less than 5k miles since then, however now worse problem is car starts on the button runs for about 3-5 seconds then cuts out I then spend several attempts cranking it which it then starts although battery struggling after a while once running goes superbly with no loss of power or smoothness at all .

I think I know what the problem is and it appears that the fuel from high pressure is running back to the tank overnight hence only fumes left in rail allows initial start then have to crank until re-fills with fuel and away this more or less confirmed as I have a magnetic extra filter fitted between the filter and high pressure pipe prior to the rail which has see through body and was always showing full of fuel prior to these problems but now empty overnight  and my garage that I use said it seems to be fuel run back but they are busy at moment and cant look at it for ages the reason seems almost certain but the  Question is WHY ?? any ideas anyone, by the way I had new pump/injectors/fuel system drain and clean and this magnetic filter  less than 10k miles ago so hopefully its not a pump fault, any ideas greatly appreciated and sorry its so long winded.

Many Thanks


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thanks Cosmicma yes I changed the filter and still same now the flipping  bonnet will not open drivers side wont release this motor is definitely trying my patience although I love it I can see myself ditching it soon !!! I feel a fire coming on Lol ,


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I   would say with out a doubt that it has to be the return valve in the pump not seating as it should 

if it was anywhere else there would be a leak ????

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Thanks O.T.H. I hope not as that will be expensive and pump was new less than 10k ago but my garage are getting it on Wednesday to investigate the problem cheers again.

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Problem sorted for now at least, air was being sucked in via the magnetic filter body had been rubbing against engine bracket and worn a microscopic pinhole allowing air into system, once identified and changed system bled and new filter fitted all A OK hope it stays like that .

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