Re: sealant on fuel pump?
If memory serves me right this was a VRO engine. If it has not been converted I reccomend that you replace the VRO unit. They are expensive. I realize that the manual may give service proceedures but it is not wise to crack one open. This not only is the fuel pump but also mixes the oil. Any error in assembly could result in oil not being mixed properly. The alarms on the old ones also are not reliable.
If it was not a VRO engine or has been converted, and just has a standard fuel pump buy a rebuild kit, they are cheap.