Air in system

J

jh121

New Member
Joined
1 Mar 2015
Messages
13
Visit site
Hello,
I have I suspect a fuel line problem in my old mariner 2 stroke outboard. I suspect it could be air lock due to a leak somewhere in the fuel line. But the marina mechanic I spoke to says air is never a problem with 2 strokes. Is that true ? thks
 
If it's an onboard tank, gravity fed it won't be air.

A remote tank could be different.

If your Two stroke is running poorly, and you have checked or replaced the plug, you can assume it's going to need a good Carb clean.

Remote tank issues could be a fractured feed pipe, which would run fine with a brimmed tank, but not when the fuel gets below the fracture. Also these engines would have a fuel pump which is usually reliable, but like everything eventually need cleaning or repairing.
 
jh121 said:
thank you all for your input. I will take up each suggestion in time.
Click to expand...

You dont give any indication of the model. Little portable or whacking great zillion horse power model?

If you can keep it running by pumping the fuel line bulb it will confirm a fuel supply problem such a as a leaky fuel connector allowing air to ente,r or a defective fuel pump.

If pumping the bulb does not help suspect a carburetor problem.

If You can keep it running by playing with the choke it more or less confirms the need for a carb clean.

BUT check the sparks are good before tearing into things ... shoudl jump best part of a cm if cdi ignition.

Often a good idea to replace the spark plug(s) on small two strokes ... even if you think its a carb problem


Also find a new marina mechanic!
 
Hi Vic
It's a Mariner 150hp 2 stroke gas outboard with a remote tank.
The other thing about it is that once running , it is sometimes not smooth, as if its hunting. Stutters.
When at almost full throttle for say 5 min going nicely, its revs can suddenly drop dramatically.
Any diagnosis?
 
You must log in or register to reply here.

Share this page

Top