What year and HP?
Virtually any bypass cover from a 18HP, 20Hp through the 60's will work. You can also drill and tap your for a fitting for the pulse line. Rick
http://www.marineengine.com/boat-fo...D-12-18hp-1958-convert-2-single-line-fuel-sys
http://cgi.ebay.com/ebaymotors/1972...atQ5fPartsQ5fAccessoriesQ5fGear#ht_500wt_1182