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Join Date: Aug 2001
06-28-2008, 4:07 PM
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I have been running my boat since the middle of may with no issues. Fast forward today, I was towing my brother on the wakeboard, and about half way through the set (10 minutes into it) the motor started to sputter and come in and out of power. I pulled the throttle back to neutral and the RPM's were really low and the engine sounded like it was going to die out, and a few seconds later it just died. It woulnd't start up right away after, but if I gave it 5 min it started back up again and I could drive for about 30 seconds and it would die again. Does it sound fuel related or electrical? I also noticed my fuel and volt gauge went to 0 when all of this was happening and stayed there for about 10 seconds. I have been having an on/off issue with those gauges since the start where they go in and out at random, but I have been unable to diagnose the issue.
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Join Date: Jun 2002
06-28-2008, 6:56 PM
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I guess it would help to know what engine model do you have and if it's fuel injected or Carbureted.
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Join Date: Aug 2001
06-28-2008, 7:16 PM
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Its a 1995 Mercruiser 5.7L Carbed.
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Join Date: Nov 2003
06-28-2008, 7:46 PM
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I'm leaning more towards fuel, but it could be ignition as well with the few symptoms you described. Could be as simple as a plugged fuel filter.
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Join Date: Feb 2005
06-28-2008, 8:27 PM
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It sounds like a fuel issue, but since the guages went out at the same time, I'd definitely not rule out electrical problem. I once had corrosion on the main circuit breaker on top engine (5.7l also) that gave me intermittent issues. Had to replace it.. It's the one that looks like a red button... 50amp if I remember correctly. Also had the coil give me problems (Look for oil leaking out of the coil). Other than that, I'd check/wiggle all the wiring connections that you can find. You never know... it may be as simple as that.
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Join Date: Aug 2001
06-29-2008, 7:47 AM
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Chad, how can you check the main circuit break for issues?
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Join Date: May 2004
Location: Tyler
06-29-2008, 9:43 AM
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I'd start with the fuel filter, like sparky suggested. When was current fuel filter put it? I'd put my $$ on the fuel filter. Gauges sound like a different issue. typically a loose ground behind the dash when several work intermittently or go out at the same time. Circuit breaker may have corrosion/rust. You could pull the wires and wire brush them off, and reinstall. If you have a water separator on your fuel line, i'd check that as well.
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Join Date: Aug 2001
06-29-2008, 9:50 AM
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thanks. I just change the fuel/water seperator but can't find the fuel filter. I followed the lines from the fuel pump into the carb but its all through a hard line. Could the filter be in the carb?
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Join Date: Jun 2002
06-29-2008, 10:07 AM
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Some carbs have a small screen or filter in the inlet fitting. Many older boats have only the fuel/water seperator. Most newer boats have an inline filter between the tank and fuel pump.
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Join Date: Aug 2001
06-29-2008, 11:01 AM
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I took the fuel inlet lines off of the carb and looked in, and didn't see any normal size fuel filters, all I saw was a small screen in the vertical position that was about a 1/4 of the size of the entire opening. I assume that is the only filter in there?
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Join Date: May 2004
Location: Tyler
06-29-2008, 11:25 AM
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it's before the pump. follow the line back toward the tank. sometimes on the port stringer area.
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Join Date: Jun 2008
06-29-2008, 12:19 PM
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I HAD THIS PROBLEM A FEW YEARS AGO. THERE ARE TWO FUEL FILTERS ONE MARINE ONE AND A REGULAR CAR ONE. REPLACED THE CAR ONE RAN FINE THE REST OF THE SUMMER.
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Join Date: Dec 2006
06-29-2008, 3:07 PM
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could be the accelerator pump on your carb, if you throttle it and it falls on its face or is hard starting i wouldnt rule out needing the carb rebuilt, or having bad gas
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Join Date: Aug 2001
06-29-2008, 3:21 PM
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I looked all over today and no inline fuel filter anywhere, from the tank to the fuel/water seperator. Im guessing there isn't one on mine.
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Join Date: Feb 2002
06-29-2008, 5:35 PM
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Take a look at your cap and rotor also.
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Join Date: Aug 2001
06-29-2008, 6:32 PM
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did the cap and rotor last week, as well as new plugs and new wires. Just replaced the coil today and it seems to start up better which is a good sign, but will have to test it more to make sure it doesn't die anymore.
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