Motor Bill is correct in stating that the pump you got is probably putting out way too much pressure. That said, there are several Facet pumps (available from NAPA) that put out between 1.5 and 4 psi, which will work fine with the Midget (the SU fuel pump that come in several models of the Midget puts out 3.8 psi). If you want to e-mail me at SUfuelpumps@donobi.net, I can send you the part numbers for the correct Facet pumps.
Cheers,
Dave
http://homepages.donobi.net/sufuelpumps/