how to check engine vacume

[underpressure]

was wondering how to check to see if i have enough vacume to draw fuel mixture into the cylinders on my 15hp model 15r75c enigine,have installed new fuel pump fuel is getting to the pump and up to the carb but still cant get the pump to pulse fuel when turning engine over,clinders are in excellent shape i have approx 120 psi of compression,if you spray fuel mix into cylinders it will try to start,could it have bad reed valves ?

 

[JB]

Re: how to check engine vacume

That's a possibility, Underpressure. There are other possibilities.

Go to the Engine FAQs Forum and do "Outboard won't start".

Let us know what you find..

 

[underpressure]

Re: how to check engine vacume

hello there ,i removed the power head and removed the intake manifold and to my surprise one reed valve was missing on upper cylinder and had gotten stuck under another reed on the lower cylinder ,found all of the pieces in the motor ,im sure this is the reason for no vacume and no start,do you recommend the boysen power reeds or would you go with oem stock parts?

 

[underpressure]

Re: how to check engine vacume

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[Fl_Richard]

Re: how to check engine vacume

Unless you doing extensive engine work I would just use the stock reeds. If I'm wrong others will chime in.

 

[ezeke]

Re: how to check engine vacume

Composite reeds will not last as long as the OEM.