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    Engine dies after running for several minutes

    I can tell you that it failed the “Suck Test” suggested by some, in that I was unable to open it by sucking on it with my mouth. Being the original owner of this ‘74 Jolly Roger, I can also say that the valve was put there by the boat manufacturer when the boat was built, although back then they...
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    Engine dies after running for several minutes

    Interesting. When I first pulled it, I was expecting a ball type valve, but it seemed functional, so I left it in, with some input from the forum in another thread. When I am done testing, I will install a new valve. Online, I see Moeller valves as part of a hose barb fitting, but you can’t see...
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    Engine dies after running for several minutes

    I think you are on the right track, Alldodge. The fuel pump has been replaced & line to carb has been replaced with a PFTE line. The anti siphon valve is clean and moves freely, but perhaps there was back pressure against it that was released when I removed the fuel line. But, was the back...
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    Engine dies after running for several minutes

    I tested the boat on the lake under load with the new resistor wire and continued to experience stalling. At one point I heard popping noises like you might hear on an engine cooling down, but the engine was not overheated. I disconnected the fuel line at the carb and cranked the starter. No...
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    Engine dies after running for several minutes

    The points have not been damaged. I got the new resistor wire and installed it. I now get an even higher reading at the plus side of the coil at 11.8 volts (was 11.6 with the original resistor wire) when running. I was hoping for about 7 to 9 volts. I removed the tan wire (origin at starter)...
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    Engine dies after running for several minutes

    I ordered Mercruiser resistance cable assembly/kit 84-94227A. Looks like it is for later models with the electric choke, but I can make it work as long as the resistor wire is there. I will examine the points and condenser tomorrow to se if the 11..4 volts did any damage.
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    Engine dies after running for several minutes

    Checked the ohms on the resistor wire at 2.1. My understanding is it should be 1.8 to 2.0. Put the boat in the water and it died about 10 minutes from the launch. Coil was not hot to the touch. Voltage at the plus side of the coil was 11.4. Thinking of replacing the resistor wire, but really...
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    Engine dies after running for several minutes

    I will test on the water and report back.
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    Engine dies after running for several minutes

    Would I be better off eliminating the resistor wire, in favor of an internally resisted coil?
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    Engine dies after running for several minutes

    The coil has not gotten hot, that I can detect. If voltage is high at the coil, is the resistor wire potentially not doing the job correctly?
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    Engine dies after running for several minutes

    Sorry for the delay. I checked the voltage with the engine running and got 13.5 volts at the battery, 13.9 at the connection to the beginning of the resistor wire, and 11.3 at the positive side of the coil. Do these sound ok?
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    Engine dies after running for several minutes

    I will check tomorrow on running voltage and report back.
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    Engine dies after running for several minutes

    So, after chasing potential fuel issues for the problem, I came back to ignition. Voltage at the battery is 12.4 volts, at the end of the white wire coming from the harness plug, it is 11.6 volts, and at the + side of the coil at the end of the long multi looped resistor wire connected to the...
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    1977 140 carb replacement

    I will be interested to hear how that carb works for you.
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    Fuel Anti Siphon Valve

    It failed the suck test, with my uncalibrated mouth, but I don’t know if I can do 5 hg, or whatever a fuel pump does, and this particular valve doesn’t lend itself to the test, so I don’t think I can get a good calibration on something like a ball valve.
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    1977 140 carb replacement

    You have identified two different base bolt pattern sizes. I was not aware of that. The Rochester on my 1974 140 has a 1 7/8” x 3 1/4“ bolt pattern, which I understand to be the “small” base. I don’t see the Sierra 18-7370n bolt pattern described anywhere. Do you know what it is? What is...
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    Fuel Anti Siphon Valve

    It seems to work. Just not what I expected. Thanks Bondo.
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    1977 140 carb replacement

    There are lots of rebuilds out there. I believe the one jimmbo posted is a rebuild. The only “new” replacement I have found for the Rochester carbs for the 140s is the Sierra 18-7370n.
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    Fuel Anti Siphon Valve

    In the course of chasing an engine stalling problem on my 1974 Mercruiser 140, I pulled the fuel uptake tube and removed what I assume is the anti siphon valve from the fitting ahead of the fuel line to the fuel pump. In the attached photo, I am depressing the tank side of the spring loaded...
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    MR-1 U Joint Bellows Leak

    Thanks, Scott06. Nice to get confirmation from an expert.
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