jerry8mm wrote:
I cranked my Generac 55G generator to do its monthly 30-minute run and it cranked quickly, but then shut off after about 5 or 10 seconds. I tried this several times and it always shut off.
I checked this forum and others and found that the most likely problem was a bad fuel pump. I replaced the fuel pump, fuel filter and the air filter, but that didn't fix anything.
After a lot of testing, I found that if I removed a wire from the oil pressure switch, it would run fine. Since this switch shuts the generator off if the oil pressure is below 8 pounds, I assumed that I had a bad switch.
But just to be on the safe side, I installed an oil pressure gauge and found that I didn't have any oil pressure.
To make a long story short, I found that it was low on oil. I added about 3/4 quart of oil and now everything works fine.
Bottom line, don't overlook the obvious when troubleshooting a problem.
X2 on the oil level. I have the same gen and the oil has to be at the top of the crosshatch area of the dipstick or it shuts down. JMO
