I am not satisfied with the existing bilge pump system in my 36. It
consists of a manual Whale Gusher, operated from a lever in the
cockpit, with a 1.5" intake and outflow to a thru hull low by the
transom and a Rule 800 on an auto switch with a 3/4" outflow to a
thru hull high on the topsides.

Improving the outflow from the Rule Auto is not an option and a
larger pump pushing more water thru the 3/4" out flow won't do
anything. Ideally I would keep the small Rule in place and run a new
1.5" outlet from a new high output auto switched pump to its own
thruhull but the routing doesn't look doable. So I am considering :

1: Removing the Whale gusher and installing a large auto switched
bilge pump to the existing manual pump thruhull.

2: Installing a check valve on the manual pump intake foot and Wye
in the large pump outlet after that and push the outlet water thru
the manual pump.

3: Remove the manual pump intake foot and use the large auto
switched centrifigal as the intake for the manual pump and push the
water thru the manual pump.

I would appreciate your comments and suggestions.