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Could also be a blocked fuel tank breather pipe or a fuel cap which is creating a vacuum.
What I would suggest is that once you fill the tank, at the end of every journey 'vent' the fuel cap - this will remove any chance of a vacuum building-up, and just use the car as normal (carry a full fuel can in the boot - just in case), all going well, then you shouldn't have any more problems, and this will indicate where you need to problem-solve.
Hope that helps,
This job should never be complete - the day I think I've done it all, is the day I resign.
Currently in VelSatisfied's garage:
2005 FIAT Ducato 2.8JTD LWB Gran Volume, 2000 Kawasaki ZZR 1100 D7 'fullpower' in black + full GIVI & KAPPA luggage, 2007 MB R-Class 320 CDi Sport LWB uprated by Brabus to 300Bhp don't know if there's a 155mph limiter - will be fun finding out! 2004 Mercedes Vaneo 1.7 CDi Ambiente 7-seater