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Merc Two Stroke EFI Cranks No Start

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Merc Two Stroke EFI Cranks No Start

Old 02-25-2021, 04:15 PM
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Default Merc Two Stroke EFI Cranks No Start

First time poster, thanks for the hospitality.

I have a 2007 Merc 150 Two Stroke EFI outboard (Optimax). It's always been hard starting cold, but more recently it doesn't seem to want to start at all. If I do get her running, she tends to run great. If I stop to fish or grab lunch, no issues restarting once warm. Batteries are charged, connections are good, starter cranks but won't start. Kill switch appears to be find. Boat harness and ignition switch recently changed. Spark plugs recently changed, checked and I appear to have spark on all cylinders. Plugs looked dry when I checked them.

Leads me to believe its probably lack of fuel on cold start. External 12 gal tank connected to all new hoses and a new bulb (I'm getting a new tank built). The primer bulb was rock solid earlier when I checked it. I removed the fuel filter thinking it might have been clogged. There was enough pressure in that line that gasoline gushed everywhere, made a mess. Cleaned it up, replaced fuel filter, primed, same result. Looking for advice on where to go from here. I haven't done a ton with the pump or the injectors because I don't know exactly where I'd start.

Thanks Hull Truth!
Old 02-25-2021, 04:49 PM
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Get a fuel pressure gauge. On the rails you will see a Schrader Valve. One is for air pressure and one for fuel. You need 80 on fuel and 90psi on air.
Old 02-25-2021, 05:04 PM
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Thanks I'll pick one up and try it and repost results!
Old 02-25-2021, 05:08 PM
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That will lead you in the right direction. You can also get a cheap spark tester to check for that as well. Those two things will tell you a ton of information.
Old 02-28-2021, 04:47 AM
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Here is my update on this. I do have a spark plug tester, all my plugs were new and firing. I put some starting fluid in the intake and attempted start, engine fired for about a half a second and died, confirming my theory that there is no fuel. I got a rental pressure tester at the auto parts store, I only registered 25 psi from the shrader valve for fuel. I’m supposed to get 90. My boat sits in the water, and is hard to work on from there so I got it towed out, back on land. Looked into the issue from my driveway.

Ultimately decided I don’t have the time or maybe even the skills to change out either the pump or the compressor (I never actually checked the air pressure valve). It’s in the shop now, I’ll let y’all know what they find.

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