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45 horse MAiner hard to start

Discussion Forum at MarineEngine.com » Mercury Mariner Outboard » Archive through July 29, 2009 » 45 horse MAiner hard to start « Previous Next »

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Joseph K. Kil
Member
Username: astro101

Post Number: 6
Registered: 06-2009
Posted on Monday, July 20, 2009 - 11:39 am:   Edit Post Delete Post View Post/Check IP

Hey all, my 1986 Mariner runs great in gear, at idle, mid. throttle, and full throttle. The only problem is, it is hard to start sometimes taking a full minute. Any ideas?
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Graham Lamb
Senior Member
Username: galamb

Post Number: 5749
Registered: 05-2007


Posted on Monday, July 20, 2009 - 12:23 pm:   Edit Post Delete Post View Post/Check IP

Yes they had a crappy, gravity fed primer system that is slow to react.

Prime the snot out of it (10 seconds) before trying to cold start. And if it's electric start keep the key pressed in (choke) when you are turning the starter over as well. See if that helps...
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Joseph K. Kil
Member
Username: astro101

Post Number: 7
Registered: 06-2009
Posted on Tuesday, July 21, 2009 - 10:22 am:   Edit Post Delete Post View Post/Check IP

Thanks for the reply. I have tried all of that before, still takes awhile to start. A friend at work suggested changing the fuel pump diaphragm, what do you guys think?
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Graham Lamb
Senior Member
Username: galamb

Post Number: 5769
Registered: 05-2007


Posted on Tuesday, July 21, 2009 - 12:17 pm:   Edit Post Delete Post View Post/Check IP

If the fuel pump was bad I would suspect issues all the time, not just cold.

The primer is just a little solenoid valve, it may be shot. It has a (manual override) - little button (on the bottom I think).

Next time before you try the key, take the hood off, press the little button for 10 seconds and then fire it up. If that makes a difference, replace the valve...
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Joseph K. Kil
Member
Username: astro101

Post Number: 8
Registered: 06-2009
Posted on Saturday, July 25, 2009 - 05:47 pm:   Edit Post Delete Post View Post/Check IP

I tried the solenoid valve but it still took awhile to start. Maybe I should consider rebuilding the carbs over the winter. Don't want to do it now I can put up with a hard starting motor. There is way too much fishing left this year. Thanks for the help.

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