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I have a 2007 efi 4 stroke 90 hp outboard. bottom cylinder

Customer Question
i have a 2007 efi...
i have a 2007 efi 4 stroke 90 hp outboard. bottom cylinder keeps filling with fuel, wonder if it could just be a spark plug issue. i have pulled them and they seem to look ok, just trying to figure this out. injectors are working corectly.
Submitted: 1 year ago.Category: Boat
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Customer reply replied 1 year ago
mercury serial number 1B523321
Customer reply replied 1 year ago
Posted by JustAnswer at customer's request) Hello. I would like to request the following Expert Service(s) from you: Live Phone Call. Let me know if you need more information, or send me the service offer(s) so we can proceed.
Answered in 7 minutes by:
7/10/2016
Marine Mechanic: Jason, Marine Mechanic replied 1 year ago
Jason
Jason, Marine Mechanic
Category: Boat
Satisfied Customers: 16,290
Experience: Degree in Marine Technology. Gas and diesel marine mechanic.
Verified

Hello my name is ***** ***** am I speaking with?

When you say it's filling with fuel, is the engine actually locking up due to a hydrolocked cylinder that is full of fuel?

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Customer reply replied 1 year ago
my name is ***** ***** no its not hydro locking, it would eventually if i kept cranking. when i pull the plugs and crank it. it sprays a bunch of fuel out of the bottom cylinder and some excess out of the 2nd from bottom. i unplug the injectors for this aswell. i pulled the fuel rail yesterday and zip tied the injectors in it and cranked the engine to watch the injectors cycle and they all appear to be functioning the same. got it to fire up yesterday after leaving the plugs out over night allowing the cylinders to air dry. ive ordered plugs as no autoparts store carries them.
Customer reply replied 1 year ago
just trying to understand why it is all accumulating in the bottom cylinders. im not use to working on boats. im sure there is an explanation, i just dont get it.
Customer reply replied 1 year ago
please give me a call at(###) ###-#### ***** back outside to pull the plugs again.
Marine Mechanic: Jason, Marine Mechanic replied 1 year ago

Hi Blake,

Is there a story to this engine? When did it last start correctly? Have you ever personally seen it start correctly?

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Customer reply replied 1 year ago
it sat for 2 years, i bought it from a friend who said it ran fine before hand. when it started yesterday it ran great but i just had earmuffs on it so i only let it run for like 3 minutes. upon trying to start it again before heading to the lake today it was flooded. pulled the plugs to confirm and sure enough it was overloaded with fuel on the bottom 2.
Marine Mechanic: Jason, Marine Mechanic replied 1 year ago

Is there a primer bulb installed anyplace on the boat between the fuel tank and engine?

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Marine Mechanic: Jason, Marine Mechanic replied 1 year ago

Also, I did try to accept your request for phone service. The system says your payment did not go through to authorize the phone call. Did you want to get that squared away with customer service, or did you want to stay online?

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Marine Mechanic: Jason, Marine Mechanic replied 1 year ago

Are you still with me Blake?

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Customer reply replied 1 year ago
installed all new fuel lines and there is a bulb which is tight. it keeps overloading on fuel. really dont get it. one of the injectors must be getting stuck open, i mixed up to injectors to see if the fuel overload switches cylinders.
Marine Mechanic: Jason, Marine Mechanic replied 1 year ago

There is not supposed to be a bulb on that engine, and that might be causing the issue. Remote it and retest, and let me know if you stop getting fuel in the cylinders.

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Customer reply replied 1 year ago
still doing the same thing.
Customer reply replied 1 year ago
i moved the fuel injectors and the the spark plugs around this time to see if the problem switched cylinders it did not. another thing i notice, there is some fuel driping out of the exhaust/prop shortly after cranking. just dont understand why or how it ran yesterday. now all of the sudden it is flooding out. headed into downtown to pick up a set of plugs. found some.
Marine Mechanic: Jason, Marine Mechanic replied 1 year ago

There is a vacuum line that runs between the fuel supply module and the intake manifold. Remove that line, cycle the key from OFF to RUN a few times. Is there any fuel coming out of that line or is it dry?

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Customer reply replied 1 year ago
they are dry but i dont have the air cleaner on it right now which i see now one of the lines that hooks up to air cleaner looks similar to a fuel presure regulator, could that be the issue?
Marine Mechanic: Jason, Marine Mechanic replied 1 year ago

No that wouldn't be it. The next step is to do a compression test and see if the cylinders have any compression or not. Do that next and let me know what you get for results.

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Customer reply replied 1 year ago
compression is good.
Marine Mechanic: Jason, Marine Mechanic replied 1 year ago

What are the actual numbers?

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Customer reply replied 1 year ago
my gauge is messed up but they all showed right around 85 which is around 120 or so on my jacked up guage.
for some reason it is overloading with fuel. it has nothing to do with the rotating assembly. has to be somthing with the fuel system or spark.
Marine Mechanic: Charles, Marine Mechanic replied 1 year ago
Charles
Charles, Marine Mechanic
Category: Boat
Satisfied Customers: 3,994
Experience: US Navy (Ret) Certified Mercury Marine Tech with over a decade of repair experience.
Verified

Hello, my name is***** will assist you.

Do you still require assistance on the engine?

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Charles
Charles
Charles, Marine Mechanic
Category: Boat
Satisfied Customers: 3,994
3,994 Satisfied Customers
Experience: US Navy (Ret) Certified Mercury Marine Tech with over a decade of repair experience.

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