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Old 07-03-2016, 04:58 AM   #11
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Well I've ruled out coil because I put a new one on. I figured for $40 replacing a 27 year old coil probably wasn't a bad idea anyway. It did still die however. Then it would start but wouldn't stay running unless I kept the throttle opened. Then it would stay running. Then it died. Then it wouldn't start at all but did after a squirt of starter fluid into the secondaries. Then as I was putting to the dock (1500 rpm) it died. It started up and I was able to putt all the way back. Man, this is sure a puzzling issue. I'm starting to wonder again if it is fuel related.
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Old 07-03-2016, 10:33 AM   #12
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A 1989 5.0 would have a mechanical fuel pump, I would perform a pressure test on it. It should be 6 - 7 psi, you'll need an adaptor that inserts between the fuel line and carb input that has a nipple to connect the pressure gauge.
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Old 07-03-2016, 03:11 PM   #13
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Thanks again Mike for the help you give so many people here.

Let me ask you about vacuum. I now notice There is a vac port on the carb that is not connected to anything This photo is not of my actual carb but its a google photo of the port I'm talking about

Also there's a black plastic port on the distributor cap that is not connected to anything. These are vac advance and should connect to eachother correct?
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Old 07-03-2016, 04:29 PM   #14
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The fitting on the dist is likely a vent I discovered. But on the carb regardless that should not be open should it?
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Old 07-03-2016, 04:33 PM   #15
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Sounds like a carb rebuild is in order. Kits can be had for $30-$40.
While the carb is off, you can tell if that's an idle vacuum line or a throttle vacuum. Regardless though, it probably should be plugged.
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Old 07-03-2016, 05:05 PM   #16
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Just rebuilt by reputable carb shop .
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Old 07-03-2016, 09:54 PM   #17
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Might be worth it to take the top cover off and see what's in the bowl. Even though you rebuilt it and pumped the tank, still very possible some junk was still in the very bottom of the tank and has made it into your carb now.
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Old 07-04-2016, 12:53 AM   #18
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Good point. I went up to try a pressure test but the lake was so choppy the boat was all over the place then two pontoons full of partiers showed up at my friend dock so I just gave up for the day. Won't go out for the 4th but I can live with that. I'll get back at it Tue.
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Old 07-04-2016, 03:08 AM   #19
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Yes on the distributor its a vent.

There is no vacuum advance on a boat as it operates at constant high rpms.

A marine carb should not have a vacuum port. Try putting you finger over it when the engine is running to see if you feel a vacuum. Either way plug it.
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Old 07-05-2016, 03:02 PM   #20
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That particular vacuum port in the photo is above the throttle blades and therefore won't likely have any vac at idle, or very little, but will when the throttle is open. Regardless, as Mike said, plug it.
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