Question about Generac Guardian Ultra Source 15,000 Watt Portable Generator #04582

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Hi, I have a Generac 7550 EXL generator that has less than 10 hours of load time on it. I crank it once a month and run it for about 10 mins with a load on it. Today it cranks easily, runs for 10 seconds and shuts off. Oil is clean and full. Gas is new and full. Spark plug is also new. It cranks with one pull of the cord, runs fine and then about 10 seconds later shuts itself off. The low oil warning light does not come on either. Any ideas? I'm stumped. I pulled the filter off to make sure it is clean and can see it get plenty of gas while it is running.

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Posted on Jan 02, 2017

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SOURCE: I have a Generac 15000 watt portable generator. It

I have solved the flooding problem . unfortanetly you must remove the carb to fix it. once you remove the carb you need to remove the fuel bowl. In the bottem of the fuel bowl there is a electronic seloniod that controols the amount of fule going to combustion. this aria had varnish and gunk built up around the plunger of the selonoid, long story short clean this out with carb and chook cleaner and put it back together. start her up and she will run like a champ.

Posted on Apr 27, 2009

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SOURCE: 25 k natural gas generator will not stay running with air cleaner

I'm sorry I see that your generator is Nat gas; is it carbreted?

Posted on May 20, 2009

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SOURCE: Generac NP 50G Stops after 2-30min.

check the oil sensor circuit. I know when I take out or short out the sensor ckt on mine, it'll keep on running. low oil isn't good for any motor.

Posted on Oct 20, 2009

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SOURCE: my generac guardian RV ran for a few hours then

Check for low oil or over temp.

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SOURCE: generac gardian model:005885-0 running rough

Check the spark plugs, ignition coil etc and try to start it manually.

Posted on Jun 15, 2010

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What kind of oil do you use

Judy, Generac portable generator oil recommendations. Above 40°F, use SAE 30. Below 40°F and down to 10°F, use 10W-30. Below 10°F, use synthetic 5W-30. Oil should be changed after the first 8 hours of operation and every 200 hours of run time thereafter.
Check the attached links,instruction and guides, Good luck
"I hope this helped you out, if so let me know by pressing the helpful button. Check out some of my other posts if you need more tips and info."

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1 Answer

What weight oil does a 5550 watt take?

According to Generac for there Portable generators they recommend, Above 40°F, use SAE 30. Below 40°F and down to 10°F, use 10W-30. Below 10°F, use synthetic 5W-30. Oil should be changed after the first 8 hours of operation and every 200 hours of run time thereafter. Here is a link to get a manual if you need one. You will need your model number.

Jan 30, 2016 | Generac Electrical Supplies

1 Answer

Why does it crank and almost start on 1st try?

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1 Answer

Where is compression release

If you can get it running, run some "Sea Foam" cleaner through it. Sounds like the valves (reed) are gummed up... I don't think there is a compression release on this machine, but you can get the manural at: Generac Power Systems The best backup generator for your home business...

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My 7550 exl runs to fast

The generator needs high RPM to produce the right voltage.

Sep 06, 2014 | Electrical Supplies

1 Answer

Need Users manual for Generac 4000 EXL generator

Hi and welcome to FixYa, I am Kelly
Below is a list of all the manuals an owner should have:

For the 4000 EXL Your actual model number is 01645.
Operators manual:

Wiring Diagram:

Parts List:

Thanks for choosing FixYa,

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Generac gp6500 will not stay running for more than 20 minutes.It shuts itself down then it is hard to restart and when it does start it will not continue to run. If I let it sit for 20 min. or more it will...

Here is support product lookup. Requires more specific numbers about your gp6500.

Shuts down automatically from oil shortage.

Above 40°F, use SAE 30. Below 40°F and down to 10°F, use 10W-30. Below 10°F, use synthetic 5W-30. Oil should be changed after the first 8 hours of operation and every 200 hours of run time thereafter.

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Generator was running and quit delivering voltage while running. Turned it off and then restarted and checked voltage with no load. no smell...plenty of oil...seems like a breaker8000 exl...#...

It very well may have been a breaker that opened up permanently.

But, I bet that the generator was under heavy load for prolonged time, and one / both of the diodes in voltage regulator have opened up. You will have to disassemble the end housing of the alternator to get to these, and then test with multimeter to know for sure.

Of course, your generator may have an electronic controller, and not use diodes / capacitor at all. Since don't have model #, can't be sure.

If engine has dropped much under 1800 (4 pole alternator) or 3600 (2 pole alternator) RPMs, then alternator output would tank or be nonexistent.

Dec 09, 2009 | Generac Electrical Supplies

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