40 Hp Mercury Carb

Rollercoaster · Jul 16, 2010

1993 40 hp mercury botton carb not suckng in air. Engine run on top cylinders. All plugs firing. Bottom carb has fuel in bowl.

Dave1027 · Jul 16, 2010

Re: 40 Hp Mercury Carb

Do a compression test.

Rollercoaster · Jul 16, 2010

Re: 40 Hp Mercury Carb

Compression test good on all 4 cylinders.
Have spark on all four cylinders.

Dave1027 · Jul 16, 2010

Re: 40 Hp Mercury Carb

Possible intake manifold leak or something clogging reed block.

Rollercoaster · Jul 16, 2010

Re: 40 Hp Mercury Carb

Dave1027 said:
Possible intake manifold leak or something clogging reed block.

Is it hard to get to reed block?

Rollercoaster · Jul 16, 2010

Re: 40 Hp Mercury Carb

Rollercoaster said:
Is it hard to get to reed block?

Would reed block affect only only one carb?

Dave1027 · Jul 16, 2010

Re: 40 Hp Mercury Carb

I'm not specifically familiar with your engine but I'm pretty sure each carb has it's own reed block.