I'm not sure why you would get rid of the manual pump that a 22r comes with. They work great. If you do decide to go with an electric pump for whatever reason. Go to the parts house. Get a universal low pressure electric fuel pump (mr. Gasket has one for like $35). Get a pressure regulator as well. Set it to around 7 psi and go for it.
All that said. Been there done it, hated it. Nothing works as well as the oem pump.
