Thanks for the input,I have already put compressed air through the lines,and all seem ok,except the larger breather pipe above the filler hose (about 1/2'' diameter)which can be heard to bubble in fuel inside the tank, which i can't find any info in to confirm if its ok or not. it use to be fine with the old tank, but just doesn't like this 2nd hand tank. I will the remove the tank again and maby remove the small restrictor , or try another tank,