Question about Briggs Stratton 7,000 Watt Automatic Home Standby System with 50 amp

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My friend has a 7000watt Briggs 040301-0 genset, on natural gas, starts on excersize cycle, and shuts down on "low frequency", what should I look for? Utility power is good, (Ontario) Hydro One, and no loads have been added or removed from transfer switch, this is the third year of service.

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Posted on Jan 02, 2017

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SOURCE: I have a Briggs & Stratton Automatic Home

It sounds like the mains sense wire is disconected from the control panel or the run wire is not being cut by the aux contact on the transfer switch.
Is the transfer switch manual or motorised?

Posted on Feb 15, 2011


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1 Answer

Generator starts before it gets upto speed the frequency and voltage lights flash and the generator shuts down within 30 seconds from start. What is the problem?

Mybe power from the commercial supply had failed . Or power surge occured and the genset detected power failure.
The other cause could be air bubbles in the gasoline.The genset may need bleeding to remove air bubbles in the gasoline.

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Looking for a special B/S carburator the run on natural gas, and not regular gas.

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Most likely oil sending unit or fuel vacuum lock. Easy to check. Run with gas cap loose to allow air into tank. if it still shuts down, temporarily disconnect oil sensor. If the oil sensor is giving false reading and shutting down the engine, just leave disconnected, however, be diligent about checking oil level. Good luck.

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Model No. 040234, Serial No. 1013844067 Engine Starts, runs 20 seconds to approximately one minute and shuts down, pauses breifly, restarts and repeats the same shut down for three or four cycles then...

This is absolutely not a gas psi problem. You haven't mentioned if the unit was connected to load or not. That FC5 fault is low frequency and could very well be caused by an overload condition. Take an amperage reading while the problem is occurring. If it is not overloaded then it seems like you may have a problem with your governor control circuit assuming the engine is running ok otherwise. Some basic checks include checking mag p/u voltage (they are generally located directly over the flywheel on aircooled engines and are difficult to see so try to following wiring) while cranking / running generally it should be over 1.5 vdc. Also check for mechanical binding. If the unit never makes 60 hz. also try adjusting the govenor although If the unit did make good frequency at some point you may be having a problem with the controller. If the unit is hunting dramatically then try adjusting whats called your frequency or governor gain setting to a point that's stable.

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The generator doesn't turn off after transfering power back to the utility

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Its 230kvaperkins generator it starts normally,but after thirty minutes it shuts dawn automatically indicating low frequency

Low frequency means the RPM of the motor has fallen off.

Check your fuel is NOT contaminated or fuel filters plugged.

Further tests should focus on the govenor system. Possibly it fails when engine gets hot. the frequency is directly proportional to the engine speed.

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My laars lx cycles on and off then shuts down. Error code AGR

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My pressure washer starts on the first pull but shuts off right come

the carb is dirty, drain the carb bowl sump, then if your lucky get fresh gasoline and clean and refill the gas tank,also get a spray can of carb cleaner into the intake from the parts store and while running & gently spray into intake as not to kill engine,this may help then fresh gas can finish cleanout, otherwise the carb needs to be replaced and being a genset most dont sell a rebuild kit, and are sealed so as to keep rpm's constant on a genset for voltage output and safe levels of power output

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I hv a colemanpowermate 5000/6250w generator- won't stay running

Hi, Please understand that this type of troubleshooting is hard without seeing it but doesn't sound like a fuel issue at all. This genset does have other sensors that will shut it down like low oil and high temperature. Most likely oil from your description. You also don't say what load it is carrying, could you be plugged into something that cycles off and on and when it cycles on the genset shuts down from the overload? If you think this might be the case, disconnect everything and power up a few at a time especially things that cycle on and off like refrigerators, heaters, stoves. Good Luck!

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Generator Starts but won't continue running/dumpimg fresh fuel into filter

My answer:

Not knowing your exact model # or how old it is, and knowing only what you said above - TOTAL RUN HOURS unknown as well? - I can only give you several possibilities of what the problem might be - even though I don't know the exact model # and which engine you have on the Genset. Porter Cable as well as Coleman and others do not themselves mfr much of anything today, but like with many USA companies out there today it does private label out to a lot of mfg vendors (mostly in China btw), and the Genset gas engines are numerous. From Briggs & Stratton to Honda to Subaru and so forth...

I also don't know what normal LOAD you were putting on your Genset there, or have been putting on it previously, or at what RPM you are normally running the engine at - as to half throttle or full throttle setting?? I take it that it's a Briggs & Stratton 4-stroke single cyl, or is it a Honda 4-stroke single/twin cyl engine?

Any Genset that is going to be put into storage for that long a period of time I would first and foremost recommend running the Carb Bowl dry first by running the Genset at FULL speed, and while running turning off the gas until it dies. Thus removing as much gas from the Carb Float Bowl as possible!

Most people do not do this and forget about that small amount of stale gas in the Float Bowl, and that is what causes VARNISH in the Carb Bowl faster then anything else.

Just putting a gas preservative in the gas tank doesn't solve the VARNISH problem because that never gets down to the Carb to begin with if the gas line shut-off valve is closed before the preservative gets down there.

If the Float decides to stick while in storage, and then it's brought out to fire up naturally the gas will flood out the Carb and probably the Air Filter Box as well.

It's always better to store the Genset DRY! I know I do and I have NO problems at all with stale gas, etc.

Since all Gensets need to be run a minimum of 10 minutes every 30 days (every 1 month religiously), or whatever your owners manual recommends - if you haven't been doing this, or don't run the gas out of the Float Bowl before shutting the Genset down after each use - then most likely the Carb is gummy or possibly has dirty gas in the bowl and is the problem.

I seriously doubt you did any damage to the engine by the recent gas over-run and flooding.

You might try and tap carefully on the bottom or side of the Float Bowl with a hard rubber hammer first to try and see if you can dislodge the stuck Float inside. If there is a WIRE at the bottom of the Float Bowl on your model - DO NOT HIT THAT GAS SHUT-OFF SOLENOID WITH THE RUBBER HAMMER - as you will do damage to it! If this dislodges the stuck Float then your problem is solved!

You may still want to run a bottle of Carb Cleaner in the tank just in case to clean out any residual buildup in the Float Bowl, etc. If it runs fine then No Problem.

First and foremost always check your OIL LEVEL and make sure you have changed it out according to your owners manual!!!

If your Genset still runs sporadically for only a short time and then starts to cut out I would look more for like a fuel vapor lock (partially closed or clogged gas cap vent), a possible dirty fuel filter, possible water moisture in the gas tank or in the Carb bowl, possibly dirty Carb in general along with it's dirty Float Bowl, Float Pin, Float and Needle Valve, and any Adjustment Screws that go Into the Carb Body.

It's hard to say unless the Carb first is broken down, checked for proper Float action setting, and/or cleaned out accordingly if dirt is indeed present in the bottom of the Float Bowl.

If all looks good there Carb Bowl wise then you will next need to check the FLOAT adjustment itself to make sure you aren't flooding the Bowl. Your Operators/Service Manual should have that adjustment there. If not let me know and I'll post it for you. Also the air/fuel mixture Jet Adjustment Screws will need to checked as well.

Let me know if you should need that adjustment procedure as well after you first check out everything else I stated above?

That covers everything from a fuel standpoint.

Again - You do know that all Gensets should be started and run for at least 10 mins every 30 days - right? If you didn't know this - now you do! Every good operators manual should state this.

It just doesn't sound like it's starving for gas - that's for sure!

The gas tank fuel line does have an in-line fuel filter correct? If it doesn't you definitely need to add one for dirt protection!!

Having covered everything from an fuel standpoint engine wise - there is only one other thing left Genset wise.

Beings your Genset there might just have some high RUNTIME HOURS on it - it just could very possibly be what sounds like to me (and I personally HAVE SEEN this happen myself firsthand) that the generator brushes are nearly shot - as in almost worn out. They may be getting too too hot - as from excessive current draw at point of contact, and thus the generator sensing circuitry itself is doing an electrical CUTOUT!!

An added protective Genset circuit feature in that the generator itself may indeed be linked to the engine as a type of REV LIMITER or CUTOUT on the Maintenance-free Magnetron® electronic ignition. Again - your operators or service manual should have a pretty good troubleshooting section in it unless you don't have that anymore or never got one if you bought it used to begin with.

If you unscrew & remove the Generator brushes, and they are indeed below the recommended length (or worse case they are indeed totally worn down) then that too most likely could be your problem right there.

If you choose to replace the old brushes with new ones yourself - be very careful when seating the new ones - as to their insertion and cap retainer tightening. Never over-tighten those black plastic-like brush retainer screw caps - for if you break one (hard to get immediate replacements is why), or fracture one it could cause the Genset to fail under LOAD, and that very well could do some severe damage to the generator part itself. Take your time doing it, and be patient!!

It has to be one of the scenarios listed above, as I've covered every possible cause short of a broken wire somewhere - which in that case you will have to schematic trace and Ohm out wire to wire contacts. This being the least likely scenario from experience.

If you indeed find the Float Bowl assy to be the cause of dirt contamination or varnish build-up clogging the Carb, and you need a walk-through of taking it apart, cleaning it out, and then re-assembling it again - as well as re-adjusting the fuel mixture Adjustment Screws - just give me a shout here, and I'll walk you through it step by step.

Please post me a reply as to the found problem there, and the resolve to it by following my recommendations above. Also please rate my troubleshooting fix as well.

Keep me posted and I'll follow up as well.

Best regards,




People experiencing starting issues often are not using fuel stabilizer or not changing their oil. I myself or any good repair shop will first pull the oil out, and most times we'll will find that it has metallic build up common from any small gas engine that has been neglected.

Aug 28, 2008 | Electrical Supplies

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