Mercury EFI Bigfoot 40 outboard motor turns over but will not start. Has fresh fuel. Any ideas?

SOURCE: 1996 Mercury 150 Nitro EFI

Dont have the manual in front of me...recollect that there's two types of warnings. The pulsating warning is oil (starts with 30 minutes of oil left) or the fuel filter (or sperator, something like that) may have water in it. Running outboard with cover off, is a little black box that would have a red light lit if that's the case. If oil full & no red light, may be oil injection system...would also check to make sure lines aren't pinched, etc. Mine has been specific to oil the two times its gone off.

The full non-pulsating is engine overheat. Not sure beyond that.

Not much, but hopefully gets you going.

SOURCE: 1999 Mercury Mariner 9.9hp outboard motor

should be on the side with a lever but could you give me more info please

SOURCE: mercury outboard 60 motor turning over but not firing up.

get some starting fluid and spray a liberal amount into the air intake, then try to turn over. if it will not turn over with starting fluid you have a problem either with your ignition system, example: plugs, coils, wires, ect. If it does fire and then die out with a shot of starting fluid then you have a carb problem. If the boat has been sitting anything over a month thats where I'm betting the problem is. Post back after you find out if its a fuel, or fire issue and we'll start the repair process.

SOURCE: Free wiring diagram for 1978 Mercury Outboard 115 HP boat motor

I have a maintainance manual for this engine (I have the same one) with pages of wiring diagrams. What specific system/area are you interested in, I could scan in the page(s) and email them to you.

Mark

SOURCE: changed the ignition switch on 150 EFI mercury Outboard

just take the old one off and put the new one on just like you took the old one off