Is there an extended tank kit for Coleman 2.5hp outboard?

The 2.5hp Coleman is a great motor - and I've had dozen different outboards and the Coleman is the most reliable, powerful little sucker I've ever had.  It is almost identical to the 5HP one,  except it does not have a fuel pump and t-fitting for an external tank  and worse--- its internal tank is really small.    Is there a kit available to add these parts and allow me to use an external tank.