85 Mariner 40hp does not run well when throttle is incresed

G

gh338

Cadet
Joined
May 23, 2012
Messages
18
I have cleaned the carbs and the fuel filter looks clean.

The issue is this -- I can start the motor up with no problem and put it in gear and run it at around 2-5mph but as soon as I want to go faster it bogs down and wants to die. It also seems to be surging a little when I leave the throttle in one spot. I am at a loss here and do not know what to try next. Please help!!!
 
jerryjerry05

jerryjerry05

Supreme Mariner
Joined
May 7, 2008
Messages
18,196
Re: 85 Mariner 40hp does not run well when throttle is incresed

Start with a compression/spark test.
Then look into the fuel pump.
Any inline connectors? They could be sucking air.
Tank vent,open?
Built in tank,vent line clogged?
Plugs burning ok?
 
G

gh338

Cadet
Joined
May 23, 2012
Messages
18
Re: 85 Mariner 40hp does not run well when throttle is incresed

Should the primer bulb on the fuel line stay firm while running the motor? That is the only thing I have not checked. So basically you think it is lack of fuel and too much air?
 
G

gh338

Cadet
Joined
May 23, 2012
Messages
18
Re: 85 Mariner 40hp does not run well when throttle is incresed

I just wanted to update this post with my solution to the issue. What it came down to was the fuel line and primer bulb. I bought the whole kit and replaced and it worked right away. Thanks for giving me some ideas on where to start.
 
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