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Old 09-04-2013, 05:08 PM   #11
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One guy who put the lower unites without lining up the water tubes correctly had the same issues, and claimed it was because it caused it not to have enough "back pressure"? I would rather not re install the out drive, as I think it is fine now. All I did lately is replaced a shattered water flap in the engine exhaust and replace the spark plugs. But I will snoop around the engine room looking for a loose wire or fuel tube?
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Old 09-04-2013, 07:10 PM   #12
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That "back pressure" story doesn't hold water with me. The term back pressure is usually in reference to the exhaust system where the engine has back pressure as the exhaust valve is still slightly open as the piston starts it's down stroke at the end of the exhaust cycle.

Think of it this way your car will still run without any coolant in the system, well for a short time till it overheats.

Try spraying some ether in the carb, if it runs a short time (seconds) it tells you there is spark but not getting fuel as the engine dies once the ether is burned. If it doesn't run on ether then a spark or timing issue probably exists.
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Old 09-04-2013, 08:23 PM   #13
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So, with beer in hand, you didn't happen to hit the lanyard kill switch on the throttle panel did you? I would start looking for the 3 simple things necessary to make an engine run, 1.) Spark, 2.) Fuel, 3.) Air. Since you most likely don't have an air issue, you are down to spark and fuel. Your description leads me to think either the kill switch was inadvertantly hit or you are fuel starved. When was the last time you changed the water seperator/fuel filter?

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Old 09-04-2013, 10:42 PM   #14
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Excellent idea Mike. We used to do that back in the day when we worked on our POS 56 chevys and fords. I will try that I am thinking it is a fuel issue. Does the engine have to be running for gas to shoot into the carb while pushing the throttle forward? Because, of course, I cannot start the engine. But I didn't work on anything other than what we have been discussing. Sometimes things happen when you are working on something else, and it throws you. I changed the plugs but cannot see any places where I could have effected the fuel. No loose ends that I can see. When my wife pushed the throttle forward a couple of times, the carb made it's motions, but I could not see or smell any fuel. My next plan is to replace the fuel filter. The fact that it started today for about 12 seconds makes me believe that it was running on the fuel in the filter, then died when it ran out.
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Old 09-04-2013, 10:47 PM   #15
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Ummmm. I may be from the north, but I an not stupid...just not a boat mechanic...lol. No, that is not the problem. I don't think it is getting fuel. Why this is happening after I changed the plugs and worked on the out drive may be a coincidence. The boat has been sitting since 2004, so anything could fail after momentary use. I will let you know what I find, but I doubt new plugs are the problem. The fuel filter is the next thing to be replaced...due for it anyway. And no, the gas tank is not empty.
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Old 09-05-2013, 12:09 AM   #16
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"not stupid"? I assume you are refering to JP comment about hitting the the kill switch. You would be surprised how many times this is the cause.

No the engine doen't need to be running for the carb to squirt when pumping the throttle.

So not ran since 2004, well I bet the gas that is in the tank is no good as the newer gas has ethonol (sp?) that will asborb water to a point then phase seperates. Try pulling the fuel hose off the thank that goes to the fuel pump and stick it a gas can with fresh gas to see if it will run on that but you will need t get the old gas out of he fuel filter first.
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Old 09-05-2013, 01:40 AM   #17
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Hairy, Please don't take my comment on the kill switch as condescending, I personally have bumped the switch and not realized it. Sometimes the simplest things can be the cause of your problem. Another possibility could be a clogged fuel tank vent. Good luck and keep us posted.
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Old 09-05-2013, 02:00 PM   #18
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HL, The boats' been sitting for 9 years, the fuel system, from the pick up in the tank to the passages in the carb, could have all sorts of gunk in it.

It certainly could be the fuel filter but, IMO, for this test I doubt the filter is cutting off gas flow completely. As was mentioned, the very first thing to do is remove the flame arrestor, look down into the top of the carb with a flashlight while someone operates the throttle.

As was said, if the carb is getting gas you will see two squirts of gas when the throttle is moved. If you don't see those squirts it isn't getting gas for some reason. If it isn't getting gas remove the line that connects to the carb, stick an empty water bottle on it, and turn the ignition on or crank the engine. Gas should flow. Check for spark as was suggested.
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Old 09-05-2013, 05:44 PM   #19
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OK, after a night of rest, my mind is clearer. So, what did I did just before the engine would not run? I tried to re-install the lower unit, the throttle got stuck forward (because of the two pieces in the lower unit not aligning, so I (now this IS stupid, but deliberate) tried to force the throttle shift back to neutral (center position). I did use a good amount of force to get it almost back in neutral. Keeping in mind that the lower unit still had a misaligned two pieces that connects to the cable that goes to the throttle shift at the helm.
So I think I have to start there. Nothing else could have broke or went bad in one day. Any ideas on if any broken or misplaced cables could stop fuel from getting to the carb? Thanks in advance.
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Old 09-05-2013, 05:57 PM   #20
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I don't know of any connection between the cables and fuel. There is a netural saftey switch in the shifter but if broken or misaligned would not allow the engine to crank just like in a car that only be started in park or netural.

I really don't think anything you did replacing the water pump is causing the current issue. I'll refer back to my previous post on further direction.
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