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90 hp 4 stroke efi 2008. Was having trouble like it was
hi, 90 hp 4 stroke efi 2008. Was having trouble like it was starving for fuel. Would have to go back and squeeze ball to keep it going. replaced everything in fuel module. low pump hi pump float , reg… read more
Jason
Jason
Marine Mechanic
18,636 satisfied customers
2012 Mercury (90 EFI outboard) starts at cold great. Run at
2012 Mercury (90 EFI outboard) starts at cold great. Run at no wake speed to open water. Throttle up to 3 to 4500 RPM's sputters a little then runs great for as long as you want to go that speed. Idle… read more
Charles
Charles
Certified Mercury Tech
5,070 satisfied customers
I have a 115 4 stroke Mercury i have found that 90% of foam
i have a 115 4 stroke Mercury i have found that 90% of foam from air cleaner is no longer there it must have gone into engine. The only way I can start and keep running is to hold choke button in … read more
Charles
Charles
Certified Mercury Tech
5,070 satisfied customers
I bought a pontoon a few weeks ago with the 90 hp 4 stroke
I bought a pontoon a few weeks ago with the 90 hp 4 stroke efi motor. It had been stored for about a year and it had ethanol fuel in it. I drained all of the fuel out of it, cleaned the fuel supply mo… read more
Jason
Jason
Marine Mechanic
18,636 satisfied customers
My 90hp efi 4 stroke Mercury when I throttle up sucks the primer
My 90hp efi 4 stroke Mercury when I throttle up sucks the primer ball flat causing the fuel to be restricted to the engine. I have changed all fuel filters, primer ball, gas line and water separator. … read more
Charles
Charles
Certified Mercury Tech
5,070 satisfied customers
I have a 06 90hp 4 stroke efi. It act like it is running out
I have a 06 90hp 4 stroke efi. It act like it is running out of fuel after running for a while at various speeds. The fuel system seems to lose its prime. I can squeeze the primer bulb and it will smo… read more
Jason
Jason
Marine Mechanic
18,636 satisfied customers
I have a 2010 90hp mercury 4 stroke efi 4th season. Anything
I have a 2010 90hp mercury 4 stroke efi 4th season. Anything above about 1/4 throttle the engine runs very rough & feels like a very bad misfire. Any ideals on this problem? Engine has never give any … read more
Jason
Jason
Marine Mechanic
18,636 satisfied customers
New battery being discharged when boat is cruising. Is this
New battery being discharged when boat is cruising. Is this an alternator or voltage regulator problem? Engine mercury 4 stroke 90hp efi 2007.… read more
Jason
Jason
Marine Mechanic
18,636 satisfied customers
Hi, I am planning to purchase a new 2013 Mercury 90HP ELPT
Hi, I am planning to purchase a new 2013 Mercury 90HP ELPT Four Stroke EFI outboard engine. I don't want dealer to install a 2011 or 2012 and tell me it's the exactly the same as the 2013..., their mu… read more
Jason
Jason
Marine Mechanic
18,636 satisfied customers
2007 Mercury EFI 4 stroke 25hp - wont start. motor turns over,
2007 Mercury EFI 4 stroke 25hp - wont start. motor turns over, good gas, fuel filter clean, spark plugs clean... thoughts?… read more
Charles
Charles
Certified Mercury Tech
5,070 satisfied customers
my engine has trouble starting in the morning when cold. once
my engine has trouble starting in the morning when cold. once it starts it runs great all day. my mech. says its the valves and wants 2 grand to fix it… read more
Charles
Charles
Certified Mercury Tech
5,070 satisfied customers
I have a 2003 4 stroke Mercury 90HP; it does not have EFI.
I have a 2003 4 stroke Mercury 90HP; it does not have EFI. The voltage regulator/rectifier has gone up in smoke and I am trying to find a replacement. I come up with two part numbers 804278A12 ($446.5… read more
James
James
Certified Marine Mechanic
Vocational, Technical or Trade Scho
4,094 satisfied customers
hi i have a 2011 mercury efi 90hp 4 stroke, and i took it out
hi i have a 2011 mercury efi 90hp 4 stroke, and i took it out today and the motor is running rough on idle and on high rpm, and when its on throttle will run rough and after a few minutes runs well...… read more
Noel Schembri
Noel Schembri
Marine mechanic
Diploma
1,739 satisfied customers
my 2003 90hp 4 stroke needs half throttle to start, and when
my 2003 90hp 4 stroke needs half throttle to start, and when i try to shift into gear it dies out. if i do get it to run ,it will run slow then speed up and slow again without touching the thottle i c… read more
James
James
Certified Marine Mechanic
Vocational, Technical or Trade Scho
4,094 satisfied customers
I have a 2007 mercury 90hp efi 4 stroke. The motor lopes and
I have a 2007 mercury 90hp efi 4 stroke. The motor lopes and eventually dies when in idle. It seems to run fine at higher rpm's. I have changed the fuel filters but problem remails.… read more
Jeremy R.
Jeremy R.
5,362 satisfied customers
when turning key to start i here 7 beeps and engine will not
when turning key to start i here 7 beeps and engine will not start . murcury outboard 90hp 4-stroke .… read more
Jeremy R.
Jeremy R.
5,362 satisfied customers
i own a 2004 Mercury 40hp 4 stroke EFI Big Foot, i want to
i own a 2004 Mercury 40hp 4 stroke EFI Big Foot, i want to switch the engine for a 2001 Mercury 75hp 4 Stroke EFI. The lower unit his missing on the 75Hp. The 2004 40hp lower unit would it fit ? If no… read more
Scott
Scott
Marine technician
Vocational, Technical or Trade Scho
543 satisfied customers
2006 Mercury 115 hp outboard motor, runs good for a while then
2006 Mercury 115 hp outboard motor, runs good for a while then starts sputtering, losing power then sometimes cuts off while cruising. Seems to get worse the faster you run it. Took it in for service … read more
ROCKET
ROCKET
MASTER CERTIFIED TECH
Vocational, Technical or Trade Scho
426 satisfied customers
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Disclaimer: Information in questions, answers, and other posts on this site ("Posts") comes from individual users, not JustAnswer; JustAnswer is not responsible for Posts. Posts are for general information, are not intended to substitute for informed professional advice (medical, legal, veterinary, financial, etc.), or to establish a professional-client relationship. The site and services are provided "as is" with no warranty or representations by JustAnswer regarding the qualifications of Experts. To see what credentials have been verified by a third-party service, please click on the "Verified" symbol in some Experts' profiles. JustAnswer is not intended or designed for EMERGENCY questions which should be directed immediately by telephone or in-person to qualified professionals.

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