Don't have that exact model but do have four different Shurflo pumps on my boat
and this one likes like the same type.
All very easy to overhaul
. Your leak could be a bad seal or o-ring or even a loose screw. Parts
kits are also easy to get. As I recall
, Defender is an official Shurflo dealer and has all parts
for all models.
If you have any questions they also offer very good tech support. If you can't fix the problem you can email
them and get a reply from a guy that knows the pumps well.