Pressure washer cuts off

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  #1  
Old 03-30-20, 02:03 PM
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Pressure washer cuts off

I have a snapper pressure washer with a briggs and Stratton engine. It sat for about a year. Today I was able to clean it up and get it started after doing all of the following

removed and cleaned carburetor
took off fuel tank and cleaned
filled with fresh gas
new spark plug
new air filter
New fuel lines

so after all that I got it to turn over and using starting fluid it would run for about 2 seconds and shutoff. I then removed and cleaned the unloader valve and it would then run for about a minute and shut off.

I think it is an unloader valve issue but from what I have read via google, the unloader valve would not cause it the shut off when it is idling.

Any help would be appreciated!
 

Last edited by Robbiejames; 03-30-20 at 02:42 PM.
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Old 03-30-20, 05:02 PM
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My first guess is the carburetor needs cleaning again.
 
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Old 03-30-20, 06:00 PM
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Agreed, more carburetor cleaning. Pay particular attention to the holes int he bolt that hold the bowl on. Depending on which engine you have, there may be up to 4 holes to need to open up in that bolt.
 
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Old 03-30-20, 06:14 PM
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I took the carburetor off again and cleaned everything again. I took a small wire(a bread twist tie) and used it to clean out every hole in the carburetor and the bolt and still will only run for about a minute.

should I just order a new Carburetor?

man this is frustrating...

 
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Old 03-30-20, 06:49 PM
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should I just order a new Carburetor?
That's up to you.

I have not always had good luck cleaning gummed up carbs.
The small engine places drop the carb into a tank of cleaning solution that usually does the job.
 
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Old 03-30-20, 06:55 PM
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I will call and see how much they will charge to clean this one vs buying a new one. Seems like I can order one for around 20 bucks.
 
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Old 03-30-20, 11:35 PM
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Probably worth the $20 to be done with it.
 
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Old 03-31-20, 02:30 AM
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It sat for about a year
So all those varnishes came out of he gas, a quick clean of he carb really wont get them off, they need to soak in carb cleaner till they dissolve.

Watch the cheap China made low cost carbs that you find on Ebay, they are cheap knock offs and their success rate is very low!
 
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Old 03-31-20, 06:42 AM
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I ordered one off amazon and hopefully it will cure the problem.
 
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Old 04-11-20, 01:20 PM
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So I put a new carburetor on and it fired up and ran for about 20 minutes and then cut off. I started it right back up and it ran for another 25-30 minutes and that same cycle of running and cutting off continued.

any suggestions on why it would do this?
 
  #11  
Old 04-11-20, 02:28 PM
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Only thing I can think of is the gas tank vent.
 
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Old 04-11-20, 02:43 PM
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I will look into that and see what happens when I make sure it is vented.

I am also thinking it could be the ignition coil. When it gets hot it is cutting out. I plan to test the coil cold and then again after I run it and itís hot. If there is a significant drop I would think that would mean it is bad.

any idea what the ohms should be cold and hot?
 
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Old 04-11-20, 04:24 PM
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Sorry but I do not know what is but with luck others will.

Could be also a bad connection that opens when the unit heats up and closes when it cools a little.
Had an alternator once that did this. Wire inside broke but still made contact till the alternator heated up.
 
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Old 04-11-20, 06:49 PM
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Iím thinking pretty much the same thing is happening with this, although itís not a alternator, I think it is getting hot and not putting out as much to the spark plug so it stops firing.

I think if I canít figure out what the ohm values should be hot and cold I will just test them and if itís a big difference I will just replace the coil. I just hate to throw parts at it and it not fix it.
 
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Old 04-12-20, 01:37 AM
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How is the fuel supply to the carb? Did you try running it with the fuel cap loose?
 
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Old 04-12-20, 08:49 AM
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I have not tried to run it with the cap loose yet. As far as the fuel supply, I took the fuel tank off and cleaned the tank and fuel lines are cleaned out too.
 
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