Jody brings up a viable point with the pre-filter, If it is too fine the pump will strain and over heat. Most are 100 micron inlet filters and I have used as small as 35 micron (Earls). You mentioned:
"With the new pump I did add a filter, but like you said, I added small one to prevent problems drawing fuel." When you mean small do you mean physical size or the size of the media? Do you know what micron size the media is? If you can not figure out the micron size, it may be worth while to remove it and see what happens, though I would not run without some kind of pre filter.
Hope this helps.
Mike Norris
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