Author Topic: Trouble starting, ideas or thoughts?  (Read 3448 times)

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Offline dszczucinski

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Trouble starting, ideas or thoughts?
« on: May 27, 2018, 08:13:05 PM »
Hey all,

The C512 is back on the water but has been doing some weird stuff. It has had a little trouble starting, but only after driving it for a bit. We will go out tubing or skiing, then take a break for an hour or so, and when we go to start it back up, it takes a bit to get it going. Additionally and could be related, the engine runs great and at the right temp when driving, but when we shut it off it heats up to 170-180. I don’t think we have changed the impeller in a few years so it’s probably due. We just replaced  spark plugs and ignition coil.

Any thoughts?

Offline Jason

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Re: Trouble starting, ideas or thoughts?
« Reply #1 on: May 27, 2018, 09:04:55 PM »
My 140 is occasionally like that too. I haven’t noticed the temp increase after shutting it off though. Make sure your choke is adjusted properly. Should be fully open. My starting process for when warm is throttle slightly above idle, crank, if it doesn’t  start pretty quick I increase throttle till WOT then leave it there till she starts. Then back off back on throttle. If still nothing, give a pump or two. Still nothing.....starting fluid!
Jason S.
1974 Glastron Carlson CV16SS 140 I/O
1986 Glastron Carlson CV23 260 I/O

Offline dszczucinski

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Re: Trouble starting, ideas or thoughts?
« Reply #2 on: May 27, 2018, 09:30:38 PM »
It almost seems as though pumping it makes it worse? If we are switching skiers or tubers it starts right back up. Only when we sit and chill for awhile, like 45 minutes or more does it struggle. Starting with the throttle open a bit seems to help.

Offline dorelse

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Re: Trouble starting, ideas or thoughts?
« Reply #3 on: May 27, 2018, 09:48:11 PM »
Have you tried cracking open the fuel fill cap just to let more air in? 
1990 Sierra 1700

Offline dszczucinski

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Re: Trouble starting, ideas or thoughts?
« Reply #4 on: May 27, 2018, 09:53:18 PM »
I have not but don’t see why it would hurt to try. What’s the reasoning behind the method?

Offline dorelse

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Re: Trouble starting, ideas or thoughts?
« Reply #5 on: May 27, 2018, 10:47:38 PM »
I have not but don’t see why it would hurt to try. What’s the reasoning behind the method?

Allows the fuel to be drawn up if there's a suction/venting issue on the tank...
1990 Sierra 1700

Offline Jason

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Re: Trouble starting, ideas or thoughts?
« Reply #6 on: May 27, 2018, 11:45:03 PM »
My thought is that it floods out while sitting hot. Might be a slow draw of fuel over that hour. That’s why it’s hard starting and requires a full throttle start. After a long break like overnight the fuel has time to evaporate.
Jason S.
1974 Glastron Carlson CV16SS 140 I/O
1986 Glastron Carlson CV23 260 I/O

Offline dszczucinski

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Re: Trouble starting, ideas or thoughts?
« Reply #7 on: May 28, 2018, 07:28:34 AM »
@Jason that’s kinda what I was thinking. Perhaps the heat is causing the draw, and the needle isn’t stopping the flow. I’ll look down the throttle body next time we shut it off to see if I can see fuel leaking into it from the float.

Offline Plugcheck

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Re: Trouble starting, ideas or thoughts?
« Reply #8 on: May 28, 2018, 11:19:12 AM »
Sounds typical of a condition called "heat soak". Temp rises while sitting and boils off fuel.  This condition is well documented on the web, so take a look at some of those articles.  Now going out of my comfort zone a bit, the design of the cooling system and impeller should keep the block and manifold full of water, I wonder if the impeller is marginal, would it allow the water level in the manifold and block to drop causing both the heat rise and the fuel issue. 
Michael
1979 CVZ-18 388 CI Vortec Mouse
1980 CVX-16SS 140 Mercruiser
1979 CVX-16 Johnson 175
2002 Bennington 2275CC 90 Mercury
1985 Intimidator project
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Offline dszczucinski

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Re: Trouble starting, ideas or thoughts?
« Reply #9 on: May 29, 2018, 11:10:06 AM »
@Plugcheck, I appreciate the info! I was kinda leaning toward that possibility as well. We haven't had to change the impeller in a few years so it is probably time either way.

Offline dorelse

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Re: Trouble starting, ideas or thoughts?
« Reply #10 on: May 29, 2018, 11:31:51 AM »
I just know that on my Metric, the vent line didn't vent very well, and I could occasionally hear the tank flexing in/out as it tried to draw up fuel.  By opening the fill cap just a little bit, it allowed it to draw up fuel much easier.

I even re-ran a new vent line and make sure it could vent properly...still flexing the tank on start up.  Cracked open the fill cap, no more issues.
1990 Sierra 1700