Hi and thanks all for your posts.
I checked the prefilter and there is quite a bit of algae looking crud in there. I just put a new prefilter and filter on a few weeks ago, so there must be quite a garden in my tank!

I have the new style primer pump and pumped it a few times. Noticed there were little air bubbles coming up from the forward end of the prefilter. Does ths suggest air in the line?

Looks like so much gunk in the prefilter that it is prohibiting a good flow of fuel.