As Todd made mention to above, until the problem is resolved in the app it only takes a few seconds to open LOU in your phn browser & make your changes there
A good quality check valve either inline or at the water separator and/or a simple inline shut off valve between the fuel source & the primer bulb to the kicker is the only fool proof way to do it in my opinion and the many others who have done severe damage or blown there main engine due to a lean mixture. Primer bulb will work and alot get away with it, BUT alot don't & thats where the trouble comes in. That primer bulb is designed for one thing and thats a very simple inexpensive internal check type ball or flapper to facilitate getting fuel a short distance from the tank to the engine only. Example is when you have to hold the bulb vertical with the arrow of flow pointing up to even get the valve to seal & draw fuel when your pumping up you outboard, now what is it doing when it laying horizontal or slightly angled down? You have no idea . Every one has there own opinions when it comes to this but I've seen to many costly repairs to the main engine or engines that could of been avoided by doing it right the first time & not relying on an inexpensive primer bulb that wasent designed for that purpose to start with.
From personal experience 4200 or life caulk would be my recommendations. If you have ever tried to get anything apart after using 5200 you would know why.
I know the boat. 87 was a transition year so to speak. If the engine now has a full circle rear main seal you should be ok. If not the flywheel will be different