Re: 1991 johnson 225 vro
there is the new mixing pump, OMS, that i would change to, if i did not want to mix.
there is also, a new premix pump that replaces the VRO,VRO2, and OMS pumps.
Vro Replacement Fuel Pump Kit "no Oil"
(for Using Oil/gas Pre-mix In Fuel Tank)
#5007422 it is in the $300 range.
if you want to premix this is the correct pump to use. this has come out since the article was written.