2005 3.0 Mercruiser not starting

[bellmorekennels]

Hey guys.
Have a 05 bayliner with 3.0 mercruiser
Started boat few days ago.
Changed out a faulty tachometer

Tried to start today, it cranks but doesnt turn over.
I def smell the gas flowing.

Thinking maybe the kill switch??
Any help guys would be great..
Thanks
Anthony

 

[Fun Times]

As a quick test, remove the gray wire from the back of the tach gauge and see if it will start...good luck.

 

[bellmorekennels]

Ok.
Thanks will try tomorrow

 

[alldodge]

Thinking maybe the kill switch??

Could be, if the kill switch is off the motor will crank but it will not start. The kill switch should be on your throttle handle.

 

[bellmorekennels]

Yes.
The switch is on on.
How long should I waite to start again if engine is flooded??

 

[alldodge]

Yes.
The switch is on on.
How long should I waite to start again if engine is flooded??

Not that long, push throttle full forward and crank. How do you know its flooded?

 

[bellmorekennels]

Alldodge, I do not know if its flooded.
Just wanted to see how long would be best to waite, if that was the problem

 

[Bondo]

Changed out a faulty tachometer

Ayuh,..... Welcome Aboard,..... Check for voltage at the coil,.....

Recheck yer tach install,.... it can ground out the ignition,.....

 

[bellmorekennels]

Bondo.
Thank you.
I will disconnect tomorrow and see if makes any difference

 

[bellmorekennels]

Ok.
Bingo.
Disconnected new tach and she started up.

What would cause this?
It has same connections as old tach
Old tach didnt have any reading

 

[alldodge]

What would cause this?

Either a new bad tach, mis wired new tach or damage wire shorting out coming from coil