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Old 06-02-2014, 12:41 PM   #1
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Default engine stops when tank still half full

Hi
I have an 1800Sr 4.2 liter mercruser - I was showing half a tank of gas when the engine cut out - I thought perhaps a faulty guage or sender, and in fact I had ran out of fuel, however when I was towed back by the rescue boat and refueled, it only took 15 gallons (of a 30 gallon tank) which confirms gauge accuracy - and its is now working perfectly - im worried that it will cut out when it gets to half full again - does anyone know what this could be?
Brian
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Old 06-02-2014, 02:33 PM   #2
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Maybe the pick up tube in the tank has broken off half way down.
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Old 06-02-2014, 03:24 PM   #3
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Thats a good possibility and worth checking
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Maybe the pick up tube in the tank has broken off half way down.
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Old 06-06-2014, 03:36 PM   #4
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Brian welcome aboard.

If it happens again you need to verify that the reason it stopped running is because the engine is not getting any fuel. While filling the tank seems to coincide with it running again several other factors may have changed. Kind of guessing until you can verify it is either a fuel or spark issue.
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Old 06-07-2014, 02:46 PM   #5
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I once had an Scarab that did that on one engine. Each engine had dedicated pick up tubes in the tank & as mentioned above I would start there. Mine ended up being a weak mechanical fuel pump that was easily replaced. No doubt you may have to run out a couple times to narrow the search.
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Old 06-13-2014, 12:32 PM   #6
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I had that happen on my 23ft. There is a non return valve in the fuel line coming from the tank. Its in case the boat tips over, gas wont leak. I removed it and never had another problem. And the boat never turned completely over either. DUH
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Old 06-19-2014, 06:53 AM   #7
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These are very common issue and often related to three areas. vacuum leak. idle speed control valve sticking. low fuel pressure. a diagnostic check ought to be best able to assist in locating the area of issue.. breathing problems can in extreme cases also cause such faults.
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