[macojoe]

could be filter, vent, ball ???

First change the filter

if that don't work then check the vents, blow some air in there, from a compressor, spiders like to make a nest in there and they can screw things up easy!!

Check tank for water!! The vents under the rub rail are pron to allow water to get in!!

I moved my vent location so they would not spilll fuel any more and water never gets in now!!

If the ball is old it might have some cracks in it that does not allow it to maintain its hard on :o I mean it won't stay hard and you lose fuel

Last of all fuel pump, but if you are running portable tanks with no problem I am sure thats fine!!

Easy fix just have to see which problem you have.

My bet is water or bad gas, caused by the vents.