Go to here Mr Funnel Fuel Filter Funnels
You will see one at 45l per minute more than enough for most pumps. Never had a problem using the 19l per minute version at all but it takes practice
They are for suspended solids and water. Both are primary issues when refuelling. The issue is rarely ever fuel quality rather fuel storage that brings the contaminants.
We always ask when was the last drop to avoid the turbidity caused by dropping 10,000l into an underground tank.
Personal choice as to when you use something like this. The discussion is really about risk management of refuelling. I have seen plenty of dodgy fuel disgorged from poorly maintained JC captured by our funnels. Our JC are flushed with metho at the end of each trip and dried then again prior to refill.
Rob

