Consistency of custard. For reference the fuel although coloured red in the UK has always been bright and clean coming out of the tank. I have polished the fuel to remove any water
a few of times over the last 2 years and the filter again was clean with no water
or muck present, so this could be a long standing issue. The only couple of hints are 1/2 a teaspoon of dirt in the water separator at the end of each season and earlier this year the sight gauge on the tank stopped working which I presumed was blocked. I know why now. Fuel has always been treated with bio stuff by me and the previous owner and a variety of brands incase one only does half a job.