Thanks for the photo Ilse,
Was the DR running fine before the tank was changed?
So now the fuel inlet on the carb has been turned you should be getting petrol into the carb ok, in the carb inlet pipe (the metal one you turned) there might still be a small yellow plastic filter screen, if one is fitted I would remove it and throw it away, they are very small and clog up easily - but up to you, there are pictures here of what it looks like.
2006 DR650 won't stay running - www.DRRiders.com
The fuel level is quite low in the tank, so if the petcock is turned to 'ON' there might not be enough petrol, I would put another 10 litres into the tank at least to test it properly.
Make sure that the inline fuel filter is the right way round - to me it looks like it could possibly be on backwards - it may have an arrow on it with 'flow' written on it, but normally they would be the other way around with the narrow end of the internal (gold coloured) filter towards the tank. This is so you can see any dirt in the filter. To clean the filter, flow petrol into it from the other direction to 'back flush' it or use some brake cleaner spray. However I may be wrong - it has happened before
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