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To vent or not to vent

Discussion Forum at MarineEngine.com » Mercury Mariner Outboard » Archive through June 22, 2008 » To vent or not to vent « Previous Next »

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mike burge
Member
Username: mburge

Post Number: 7
Registered: 06-2007
Posted on Sunday, May 11, 2008 - 12:32 pm:   Edit Post Delete Post View Post/Check IP

50hp outboard 6 gal tank..do you have to vent the tank when running? it seems the more I vent the tank I lose power and stall...thank you
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Benjamin Jones
Member
Username: benjamin_jones

Post Number: 44
Registered: 04-2008


Posted on Saturday, June 21, 2008 - 05:25 am:   Edit Post Delete Post View Post/Check IP

Hi there!

You sure you're opening the vent and not closing it? Sounds like a starvation issue because no air is being let into the tank and fuel cannot be pulled up into the pump.

Or..

The pressure caused by fuel gushing around is supplying pressure to the fuel line. Maybe the pump is acting up and the pressure in the tank is compensating?

Way to test would be to open the vent, wait for motor to start spluttering, then pump the fuel bulb. If it picks up again, check the pump and fuel connections for possible air leak...

Hope this helps? Keep us posted as to the outcome.

Regards from a cold, wet and wintery Johannesburg in South Africa.

Benjamin.

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