When it stops running try releasing the fuel filler cap.If there is really bad suction then it could be the venting part of the cap has failed and is causing a build up of too much pressure in the tank.We had this once on a van and it took ages to find the culprit.
By the way,this year of Vivaro doesn't have a compatible canbus system with new obd scanners.Only the main dealers scanners will read the codes properly.The cheap scanners off ebay will read codes from this van but they won't be the right ones,giving you a nice little run around trying different sensors.Guess how i found out?The hard way of course!.
Edited by Graham567 on 25/05/2014 at 17:09
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