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Old 08-17-2015, 05:12 AM   #1
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Default Puzzling stalling issue

This problem has been plaguing us for a few seasons. Boat starts fine and initially runs fine. We tend to move about the lake (large lake) and find a nice place to chill for awhile then move again. This issue does not typically start until we've been out a couple hours, for the first little while all is right. Cruise along at 2500-3000 rpm and then she acts like she's running out of fuel although there can be as much as 3/4 of a tank. To describe the symptom: Cruising, cruising, bog, surge back, bog, surge back.... when I bring to a stop it could either stay running or stall. It will start right back up and we can cruise along if I keep it closer to 2000 rpm. Increase the rpm's and it will do it again. Not knowing for sure if it is a fuel or ignition issue, I changed the plugs and water/fuel separator. The old plugs showed signs of fuel fouling but realistically it ran just about as good as it does with the new plugs. I thought accelerator pump but really, it accelerates just fine and my understanding of the AP is it adds fuel to compensate for the rush of air at the initial opening of the throttle and it seems to be doing this. A large problem here is I cannot duplicate at home with the muffs on.

It ran with no problems last weekend on a different lake but we weren't out as long. Another difference is we had a full tank last weekend and started out with a little over 3/4 this weekend and used it down to about 5/8 of a tank. I note this because I thought maybe it had to do with fuel tank level. I'm not sure what there is in there for a pickup tube.

Well, fire away. I hope one of you guys can help me figure this out.
Thank you.
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Old 08-17-2015, 11:22 AM   #2
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You did not provide details on what engine package you have, size and if carb or injected.

However my first thought is a clogged fuel tank vent. See is bugs have built a next in the vent on the side of the boat. Another way to test is when the boat starts acting up open the gas cap and see if the problem goes away.
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Old 08-17-2015, 01:48 PM   #3
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Thanks Mike, sorry about that.
'89 2000SC Mercruiser 5.0 with a 4bbl Quadrajet.
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Old 08-17-2015, 04:10 PM   #4
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Check out the tank vent as I said first to see if this is the problem and post back.

Other thoughts are the filter in the carb or debris in the tank clogging the pick up tube.
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Old 08-18-2015, 06:31 AM   #5
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I'll check those things. Thank you Mike, you always have valuable input. I appreciate your time to the forum
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