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Dominick
Dominick, Marine Mechanic
Category: Boat
Satisfied Customers: 1009
Experience:  25 Years Experience as Mechanic, 20 Yrs Boat Yard Owner/Mechanic, Factory Certified
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When the motor gets warm there is a hissing sound by the carb

Customer Question

When the motor gets warm there is a hissing sound by the carb and the motor wants to stall
Submitted: 1 year ago.
Category: Boat
Expert:  Jason replied 1 year ago.
Hello my name is ***** ***** am I speaking with?
Expert:  Jason replied 1 year ago.
Which engine do you have in the boat? Do you have the model or serial number of it handy?
Customer: replied 1 year ago.
7.3 Volvo penta 1996 visa 258
Expert:  Jason replied 1 year ago.
Do you have the actual model number on the engine handy?
Customer: replied 1 year ago.
7.4gi PNSCE(###) ###-####(###) ###-####
Expert:  Jason replied 1 year ago.
Got it. Are you near the engine now?
Customer: replied 1 year ago.
yes
Expert:  Jason replied 1 year ago.
Start the engine up and listen around the intake very carefully and see if you can pinpoint where the hiss is coming from. Is it coming from the back of the carb? A hole in the intake manifold? Is it coming from where the carb bolts down to the intake?
Customer: replied 1 year ago.
How do I check if it's leaking without pulling the carb
Expert:  Jason replied 1 year ago.
I don't want you to pull the carb, just try to pinpoint where the hiss is coming from. I'm not there to see it so I need you to be my eyes and ears. If you can take a video with sound and throw it on youtube that would likely be helpful as well.
Customer: replied 1 year ago.
It tacks about 20 minutes
Expert:  Jason replied 1 year ago.
No problem, there are no time limits here. A hissing sound typically means a vacuum leak, it's just a question of finding it.
Expert:  Jason replied 1 year ago.
Good morning, just checking in. Any luck isolating the hissing sound?
Customer: replied 1 year ago.
Can u call me(###) ###-####
Expert:  Jason replied 1 year ago.
I definitely can, but before hand, the website does charge extra for phone call service. I just want to makes sure you are aware of that.
Customer: replied 1 year ago.
I don't care
Expert:  Jason replied 1 year ago.
I'll send the information for phone service to your email address, from there you can accept the offer. I am a bit busy at the moment helping other customers, so it might take a few minutes or more before I can actually call you.
Customer: replied 1 year ago.
When I run the motor at 1500 the will go from 1500 to 800
Expert:  Jason replied 1 year ago.
I'm sorry I don't follow you. What do you mean by the "the will go from 1500 to 800"

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