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115 mercury 4 stroke efi long beep then dies

G

green67stang

New member
running out of ideas,

I have a 115 4 stroke EFI,

the dreaded "long beep ".

What I've done,
Replaced thremostat and temp sensor.
Replaced all fuel lines from tank to motor.
took it to dealer, codes said low pressure fuel pump.
replaced both low and high pressure pumps.
Tested float passed and good.
Put air pressure from tank fuel line to motor and it held pressure with no leaks.
checked oil sensor and its good
Motor runs great, smooth as can be for about 4 minutes then long beep and shuts off. this happens in gear or nuteral.

throwing parts is getting real old

any ideas or tests I'm missing ?

thanks in advance for any responce..
 
Don't know the motor that well but if codes list "low pressure fuel pump" I would look for the sensor that reads the pressure, that could be the problem
 
green67stang said:
running out of ideas,

I have a 115 4 stroke EFI,

the dreaded "long beep ".

What I've done,
Replaced thremostat and temp sensor.
Replaced all fuel lines from tank to motor.
took it to dealer, codes said low pressure fuel pump.
replaced both low and high pressure pumps.
Tested float passed and good.
Put air pressure from tank fuel line to motor and it held pressure with no leaks.
checked oil sensor and its good
Motor runs great, smooth as can be for about 4 minutes then long beep and shuts off. this happens in gear or nuteral.
throwing parts is getting real old
any ideas or tests I'm missing ?
thanks in advance for any responce..
Click to expand...
URGENT -- PROBLEM SOLVED....
IT ENDED UP BEING THE Neutral SWITCH, HOPE THIS SAVES YOU HUNDREDS. SEARCH
MERCURY
SHIFT SWITCH
DIAGNOSIS AND REPAIR
BY SLOTH-WORX
He posted a great video showing the symptoms.
HOPE THIS SAVES YOU HUNDREDS......
 
AllDodge said:
Glad your running but the neutral safety switch will not cause any kind of a beep
Click to expand...
It does tho, I tested it.
when this issue happens,
start motor let it warm, bring motor to about 2400 rpm motor will beep stumble then die.
turn off motor and restart. unplug switch bring up to about 2400 and smooth as silk with no beep.
 
Neutral switch on many 4 strokes tell computer if motor is in gear or not.-----In neutral it prevents a novice from over revving these fine motors.----So if this switch on the motor linkages is stuck or defective you lose performance in gear.
 
The switch limits damage when a novice tries to make a motor " roar " in neutral.----And if the switch is defective the motor is limited to about 3000 RPM in gear because it is telling the ECU that motor is in neutral.
 
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