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#21
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Well I have my last couple of parts trickling in from boats.net for the Merc, hope to take a whack at getting it running either this weekend or next week. Right now I am working on some fiberglass repair on the bottom of the McKee, should keep me busy for a bit!
-Svence
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1984 V-20 Steplift 1998 Johnson 175 
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#22
05-02-2011, 06:59 AM
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She runs...well sorta. Got everything bolted on, carb leaks fixed, fuel line fixed, starter on, gased her up and she ran. Was shocked to be honest as it fired up the first crank of the key. Now the problem is she won't stay running. I think it may be a fuel pump issue as if I keep priming the bulb it stays running, if not I get about 15 seconds before she dies out on me. What I don't understand is the fuel pump on these carbs, how the hell do the work? Where do they get their pulse from to pump? I am used to seeing either an electric pump or a line from the crankcase pulsing the diaphrams, any ideas?
-Svence
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1984 V-20 Steplift 1998 Johnson 175
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#23
05-02-2011, 07:37 AM
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Pulse comes from the front half, where the carb bolts to the intake, no special lines. There should be a special base gasket that has corresponding holes to the ones in the intake and carb that all line up. I know it to be this way on some.
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#24
05-02-2011, 07:41 AM
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Look at part 42 in the schematics. It shows the little hole next to the throat of the carb.
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#25
05-02-2011, 07:57 AM
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Great, unbolting the carbs again!!!! So that little hole pulses the diaphrams in the pump to fill the bowl, got it. I am finishing up the fiberglass work today and should be able to focus on the engine later on this week so I can really troubleshoot the problem. Thanks for the help.
-Svence
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1984 V-20 Steplift 1998 Johnson 175
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#26
05-04-2011, 06:27 AM
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Got some time yesterday to look at it. It is definitely something with the fuel delivery as I can just continuously pump the ball and it will stay running. Now before I pull both carbs is there anyway to test the fuel pumps to see which (if only one...) is bad? The carbs I have include the fuel pump so I can't get a pressure gauge between the pump and the bowl and I don't know how else to test just one pump at a time because it's just a T before the two pumps. Any ideas?
-Svence
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1984 V-20 Steplift 1998 Johnson 175
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#27
05-04-2011, 07:30 AM
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I don't have a clue on how to test pressure or volume on that one. Maybe you could let her run out of fuel and then see which bowl has the least amount of fuel by removing the bolt that pinches the float bowl to the carb housing. (The dry one will only drip for a few seconds) Or better yet mix you some 2-stroke blended fuel in a squirt can and give the motor a little squirt just as it starts to run rough. (right down the throat of the carb(s).) The motor should pick up and indicate the one that is going dry. I was going to say it would be OK to keep it running on carb spray but no lubrication there. If I remember right my old 50 would run on 2 cylinders when the other 2 weren't 100%. But the other 2 were flooding out, needle stuck. Did you go into the fuel pumps when you went into the carbs?
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#28
05-04-2011, 07:45 AM
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The carbs were rebuilt prior to me buying the boat (no idea what that means though...) and looked like they were cleaned with new gaskets so I am assuming (I know, I know) the pumps were replaced. When I did tear down the one pump to find a small leak, and fixed it, the diaphrams looked good and clean with no tears/holes. I know I am going to have to tear them off the block and take them apart, just trying to minimize having to do both if I can!
Anyway, might try to bowl drain trick. You also got me thinking, might wait until it stalls out then pull the fuel line from one, plug it and pump, switch and repeat. That might let me see which needs more, IF it's just one! -Svence -Svence
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1984 V-20 Steplift 1998 Johnson 175
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#30
05-04-2011, 08:56 PM
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Well just got the gaskets pulled and I think I found the problem...The gaskets between the carb and block were upside down, the pulse hole was completely blocked. The gaskets were installed before I got the motor so I never even thought about it. Off to get two new ones tomorrow. Also going to change out the fuel pump diaphragms as I have two of them sitting here now. Hope this gets it all straightened out.
-Svence
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1984 V-20 Steplift 1998 Johnson 175
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Linear Mode
