SoCal Jet Boats

Tech Talk => Engine Mechanical / Electrical => Topic started by: soprano on January 02, 2016, 03:22:06 PM

Title: Backfire through the carb
Post by: soprano on January 02, 2016, 03:22:06 PM
I started my boat like I do once a month to keep everything  good to go. I hooked up the hose started it let it run for a while everything was good opened it up a little bit everything was fine shut it down remove the water hose when to start it up again to blow out the water backfire through the carburetor and died when to restart it wouldn't start, tried it again barely got it started sounded horrible putt putt putt putt putt like timings completely wrong and I died I didn't want to do it again figured I'd ask somebody on here any input would be cool thank you
Title: Re: Backfire through the carb
Post by: GT Jets on January 02, 2016, 05:16:24 PM
Sounds an awful lot like a blown power valve diaphragm. But you did not specify what carburetor and/or ignition system.

GT
Title: Re: Backfire through the carb
Post by: WhyNot76 on January 02, 2016, 05:17:30 PM
Don't crank it over again until you pull the plugs and check for water, might have possibly gotten reversion or just flooded water in through exhaust. I'd pull all the plugs and crank it and watch for water. Just my .02


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Title: Re: Backfire through the carb
Post by: WhyNot76 on January 02, 2016, 05:18:37 PM
Blown power valve from a carb sneeze isn't far off either..


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Title: Re: Backfire through the carb
Post by: 78Centurionbbc on January 02, 2016, 05:28:51 PM
Sounds like a blown power valve.


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Title: Re: Backfire through the carb
Post by: soprano on January 02, 2016, 05:31:33 PM
Sounds am awful lot like a blown part valve diaphragm. But you did not specify what carburetor and/or ignition system.

GT
carb is holley 800 / ignition msd..
Title: Re: Backfire through the carb
Post by: soprano on January 02, 2016, 05:32:57 PM
thanks guys I'll pull a plug tomorrow an go from there..
blown power valve is that a major / expensive fix?
Title: Re: Backfire through the carb
Post by: Onthenos on January 02, 2016, 05:49:58 PM
Power valves are less than 15.00.  Most Holley carbs have,2. They're located in the metering block.   Really easy to replace.
Title: Re: Backfire through the carb
Post by: soprano on January 02, 2016, 06:00:07 PM
Power valves are less than 15.00.  Most Holley carbs have,2. They're located in the metering block.   Really easy to replace.
thank you onthenos
Title: Re: Backfire through the carb
Post by: soprano on January 02, 2016, 06:01:13 PM
Hopefully I didn't get any water reversion an hydro lock it
Title: Re: Backfire through the carb
Post by: Onthenos on January 02, 2016, 06:03:45 PM
Did you have the water hose turned on with the engine not running?
Title: Re: Backfire through the carb
Post by: soprano on January 02, 2016, 06:11:45 PM
for like 3 sec.. but I had the hose discontinued when it backfired
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