If your Citroen C4 Picasso won't start after replacing the fuel filter, it is possible that there is air trapped in the fuel system. Here are the steps you can follow to bleed the air out of the system: 1.Fuel priming: Some diesel vehicles have a manual fuel priming pump that you can use to fill the fuel filter with diesel and purge any air.
Hvordan udskiftes drivstoffilter on CITROEN XSARA PICASSO (N68) [UNDERVISNINGSLEKTIONER AUTODOC] C4 I Grand Picasso (10.2006 - 12.2013) Filter Bremsesystem
Fuel hose connectors were easy to disconnect (if you know the technique, see pic below) and easy to refit. As I said this may be different in a diesel model C5 II 2.0i 16V - 2005 - Estate - 103KW - EW10A - Petrol - Manual
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citroen c4 grand picasso fuel filter location