I'm currently in the southern part of France on a trip with the motorhome. It behaved itself fine getting around and getting to Knutsford but coming down here it goes into "kangaroo petrol" mode where the engine hesitates and misses and bangs about. If I stop for a few minutes or few hours it goes away for a few hours. My interpretation and investigations are as follows: 1. There's rust in the fuel. I have bought a new fuel filter but it hasn't stopped it from happening. 2. I suspect that no one has filled up the van for several months. My trip here will be the first time for ages anyone has filled the tank to the brim. 3. Because of 2, condensation has occurred within the fuel tank and I've probably got rust/crap/water in there which I don't want. Possible solutions: Fuel pump could be on its way out. Van is 19 yo and has done 62k. Having a load of crud in it won't help its performance. Empty fuel tank out as best I can and clean it out Go for an electric pump to bypass the mechanical pump. This is an old performance car trick to save bhp on the mechanical pump. Remove and clean fuel pump - if possible. Any suggestions gratefully accepted.