FAQs
What type of oil should I use in my FIRMAN generator?
Conventional 10w-30 motor oil.
If you are operating in below freezing temperatures, use full synthetic 5w-30.
What type of gas should I use?
Regular unleaded 87 octane from a gas station
Higher octane fuels and rec fuel will require swapping to the proper NGK plug (spark plug) to prevent carbon build up from fuel fouling
How long will the generator run on a 20lb propane tank?
LPG burns at about 1 gal per hour at 50% load. So a 5 gallons (20L) Propane tank will last you 5-6 hours at 50% load for our bigger Hybrids Units.
For the Inverters, a 5 gals Propane Tank can last you up to 8 hours at 50% load.
Why does my generator run, but no voltage to front panel?
On Hybrids (Dual/ Tri fuel), switch the two circuit
breakers on the front control panel to the ON position
If nothing or low voltage shows up on the multi display meter, the AVR could need to be replaced or the ECM could need to be reset.
Please contact Tech Support.
What Spark Plug do I need ?
Please refer to the owner’s manual for spark plug references. A few different alternative spark plugs will be listed.
As a reminder, you can download each product’s manual from the website.
Is there a break-in period?
Changing the oil after the first 25 hours of use is the only break in procedure we recommend
Can I convert my generator to run on natural gas or propane?
No, we do not sell or recommend conversion kits as it would count as a modification and void the warranty.
Our generator was engineered and tested to an OEM specific fuel, if this fuel is change it will cause engine damage.
Can I parallel any two of your inverter generators together for more power?
Yes, you can parallel them together for more power.
For W01781/W01782 and all our 3000W Inverters: You will need the Parallel Kit 1201.
For W01682/W01784: you can parallel them together only with the cables they come with.
Can I add a remote starter to my generator?
No adding a remote start to a unit would count as a modification and void the warranty.
On HYBRID models, the propane valve would have to be left open, which means the fuel will continuously flow into the cylinder which is a fire hazard.
What is the Total Harmonic Distortion or THD ?
The THD is the fluctuation of electricity and determines the potential for problems with high-end electronics or those considered sensitive when the power goes out.
Our generators are safe with sensitive electronics.
For PERFORMANCE and HYBRID, it is roughly 11-14%.
For WHISPER, it is less than 3 %.
Do you have exhaust extension kits? Can I extend the exhaust by myself?
We do not offer any exhaust extensions. And we certainly do not recommend you trying to extend the exhaust by yourself. Doing so can cause your exhaust to back feed and prevent your generator from running well causing engine damage. It will also void the warranty.
Is it possible to reduce the noise on my generator?
No, it is not possible to reduce the noise of your generator as we do not offer any compatible noise reduction kits.
Can I install an extended run fuel tank or fuel cap?
No, this is very dangerous as it makes your generator prone to leaks and fire. It will also void the warranty on your generator.
Can I set up the generator with an automatic transfer switch?
How do I store my generator?
Do I need a High-Altitude Jet for FIRMAN generator?
If the elevation exceeds 3000 ft, yes.
Increase in altitude means a decrease in oxygen. Lower
oxygen levels mean the fuel mixture will be too rich. If the fuel mixture is too rich this leads to carbon fouling of the plug and spark arrestor, if left
unchecked this will cause too much backpressure on the engine, and it will not
run properly. You will need to order a High-Altitude Jet trough Tech Support (phone line or Chat). It is covered by the warranty.
