Originally Posted by ezstriper (Post 4196743)

Not the issue you are having here, but I don't think that merc EFI and your setup are going to work well at all....this has been around but you are way beyond the ability of that manifold with out lots of work..hopefully you changed the rails and completly redid the fuel lines/filter/etc and are using a return setup...

Originally Posted by gary gray (Post 4196723)

Now that I did replace the map sensor it will start without without giving it throttle, after 2 or 3 times. It usually will start then stall and about the third time it will idle. I did try to lower fuel pressure and it didn't seem to help. It is a boost reference regulator. The pump is a aeromotive a1000 pump, horsepower estimated at 800-850. What I don't get is on initial start up after rebuild it seem to run find, then after shutting it done once I looked it over it all went to crap.

Originally Posted by sutphen 30 (Post 4198700)

try to start it again.if it starts,continue on,if it doesn't.stop and pull some plugs.find out if they're wet or dry.then we can go from there.
sounds like tuning,,in like in the boat tuning.
wet or dry exhaust?

Originally Posted by gary gray (Post 4196806)

Fuel lines have been redone, high flow filter,a return has been added and intake ported. But I do feel the same way about set up. Was thinking about going to a fast setup or just go carberated with a blow through. Anybody have experience with the fast setup in a marine application. Would still like to get this thing going in the mean time.