Hi John,
I think in your case one of the big unknowns is the plumbing. Does the Glastar have a header tank? Remember, in these EFI/EFII systems you?ll be using a high pressure fuel rail with fresh fuel constantly flowing through/around it. That fuel MUST be supplied from and returned to the source from which it was taken. So in the case of RV?s (which doesn?t use a header thank) a duplex fuel valve must be used so the unused fuel can be returned to the same tank from which it was drawn. If your Glastar has a header tank and your engine is currently being supplied with fuel from that header tank, you should be able to just tap back into it for your return flow.
The fuel rail/ injector supply plumbing should be fairly straightforward. Both systems also require a fuel pressure regulator, so that?ll also have to be mounted on the firewall.
Both systems also incorporate duel electrical fuel pumps....(you?ll be removing your manual engine fuel pump). You?ll have to decide on a happy place to install these. Remember, pumps push better than they pull, so keep that in mind when thinking about a place to mount them.
Are you planning on a two battery or two alternator setup?...or maybe both? The bottom line, there?s so many variables to take into consideration that your question as to how many hours are required to do the installation is a very difficult one to answer.
I?ve installed one of theses systems before in a -7, so I?m fairly familiar with them. I?m also about to install one in my -8. Having never installed one of these systems in an -8, but at least being very comfortable with the system overall and understanding how everything works, I?m estimating it?s going to take me between 40-60 hours from start to finish.
Some guys may be able to do the job in half that time and others it may take them more than double that, but I?m guessing it?ll take me about that long to complete the entire transformation on my -8.
These systems really aren?t any different or difficult to install than anything else on the airplane. Just take your time, plan everything out, and take it one step at a time. I think once you have it installed and all dialed in, you?ll be very happy with the results.