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My generac was running fine then just dropped to idle no pressure

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Generator alarm underspeed


When you get the under speed alarm is the generator under load? Try manually starting the generator with no load and let it run for a while, if no alarm, then put it under your home load and measure current draw (maybe have an electrician check it) if the amp draw and in rush caused by compressors, pumps motors etc are within the generator rating, check your fuel pressure, on average 8-11 WC Nat gas. Pressure may test well under no load but drop starving the engine of fuel unde rload. Underspeed is just that engine cannot make RPM/Frequency

Nov 28, 2013 | Generac Power Systems Generac 5522 14 Kw...

1 Answer

Generac 6hp pressure washer starts and runs fine, no real leaks, but it never builds up pressure.


after making the water connections, be sure to hold the trigger open on the wand for a couple of minutes before starting. All the air must be removed from the system before it can create pressure.

Aug 28, 2013 | Briggs & Stratton Pressure Washer...

1 Answer

Need adjustment procedure for a Generac Centurion generator, carb and regulator under full load


Before you adjust anything, suggest you verify gas line for proper pressure and importantly volume. Pressure for gas should be 5 to 7 inches and propane 11 to 14 inches W.C. Also make sure the line to the generator is sized properly and the gas meter is a high volume unit (if NG). 90% we find the problem with generator sunder load that otherwise are fine are fuel related. Good luck.

Sep 19, 2012 | Generac Power Systems Centurion by 16000...

1 Answer

Hello, I installed my 10 kw #5871 guardian yesterday 2/24/11. The propane pressure was checked at all loads and never dropped. It is set at the manuals recommendation. At mid to full load it runs smooth...


I had to find out through a Generac Service Tech that the Idle screw needs to be turned down so it doesnt surge. I found this out after a surge blew $400 worth of electronics out in my home. I have a surge protector now I recommend you do the same. DG

Feb 25, 2011 | Guardian Electrical Supplies

1 Answer

Generac 4000xl high idle, idle control not working.


check to see if somthing is blocking the movement of the govenor linkage

Oct 26, 2009 | Electrical Supplies

1 Answer

Generac Watchdog 15K, engine will not start


throttle motor or governer board. or control board. your gas line could be to small. check the pressure while its cranking to see if it drops. watch the throttle to see if its moving while trying to crank the generator

Jun 27, 2009 | Generac Guardian 200 Amp Transfer Switch...

1 Answer

On a generac pressure washer that works fine.


Oil level in pump and motor OK? Spark plug not fouled? Has it sat for a while - carb dirty? Running (loaded) throttle rpm not high enough?

Mar 27, 2009 | Briggs & Stratton Power Products 1539...

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