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Generac NP75D starts readily but immediately stops when start switch is let go. Replacing low oil pressure sensor switch solved this problem 3 yrs ago, but not this time. I even replaced the circuit board ($300!) to no avail. HELP!

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  • Anonymous May 06, 2009

    generc 36lp model 00941-1 will run for up to 1 hour then quit then will re-start and run for a few minutes and die again. This just keep repeating over and over,now it will not start at all. Generator only has 25 hours on it. Seems like a very common problem with these

  • dshaffer62
    dshaffer62 Oct 22, 2012

    Make sure you have the factory recommended plugs. I have seen this problem before where the wrong plugs were installed and the engine (over time became too hot and shut down. When it cooled it started, ran and then shut down again.

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Oil temp also? and or pressure. fuel shut off valve? switch bad not keeping power on run side?

Posted on Apr 29, 2009

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Where is the oil sending unit on a 1996 mercury cougar xr7 ? Its cause my oil pressure gauge is bouncing up and down...i dont know why...can anybody please help me thank you so much


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The low oil pressure warning lamp will illuminate anytime the ignition switch is turned to the ON position without the engine running. When the engine is running, the light also illuminates if the engine oil pressure drops below a safe oil pressure level. To test the system, perform the following:
If the oil pressure light does not work, perform the following:
  1. Turn the ignition switch to the ON position.
  2. If the lamp does not light, check for a broken or disconnected wire around the engine and oil pressure sending unit switch.
  3. If the wire at the connector checks out OK, pull the connector loose from the switch and, with a jumper wire, ground the connector to the engine.
  4. With the ignition switch turned to the ON position, check the warning lamp. If the lamp lights, make sure the oil pressure switch is properly grounded in the cylinder block, and if so replace the oil pressure switch. If the lamp still fails to light, check for a burned out lamp or disconnected socket in the instrument cluster.
To diagnose an oil pressure light that stays on, perform the following:
  1. Check the engine oil level and top off as necessary. If the engine was 2 or more quarts low on oil, test start the engine after topping off the oil level and recheck the oil pressure light operation. If the light stays on, stop the engine immediately and go to the next step.
  2. Disconnect the wire at the sending unit, then turn the ignition switch to theON position. If the light remains on, check the wire from the sending unit to the gauge for being shorted to ground and repair as necessary. If the light goes out, turn the ignition switch OFF and go to the next step.
  3. Replace the oil pressure sending switch with a known good switch.
  4. Start the engine and check the oil pressure light operation. If the light stays on with the engine running, stop the engine immediately to avoid severe engine damage until the cause of the problem can be determined.

WARNING
If the oil pressure light remains on while the engine is started, stop the engine immediately. Do not operate the engine until the cause of the problem can be determined. Operating an engine with low oil pressure will cause severe internal damage.

Possible causes for an oil pressure light to stay on are:


Pinched or grounded sensor wireDefective oil pressure sending unitRestricted or severely leaking oil filterExcessive internal engine bearing clearance.Insufficient or severely contaminated engine oilBlocked oil pump pickup screen or severely worn oil pump

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Why won't my car start?


Sounds like your oil pump may have seized.You'll need a gauge to verify this. The engine has a mechanism by which it automatically cut the engine off if there's a sudden drop in pressure. I would replace the pump. If you do make sure you prime it prior to tightening the oil pan down. A big question is why you were that low on oil. Good luck!

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How do i disconnect the low oil sensor


Some oil sensors will stop the generator from running if unplugged, IE they close the circuit on oil pressure, some close the circuit on oil pressure. I wouldn't recommend but with it running just take the single wire off the sensor, if it stops immediately then it requires the signal grounded to run. Some ground on low oil.

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Why do you want to replace the oil pump? I am asking this question for good reason. Engines that have worn bearings will have low oil pressure, and replacing the pump will not solve this problem. If you are replacing the pump because of low pressure, then you really need to consider correcting the cause of the low pressure. To replace the pump, you need to remove the oil pan from the bottom of the engine, which will likely involve raising the engine. Once the oil pan is off, you can readily remove and replace the oil pump.

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It is rather the oil switch or its level sensor, because the carb should not let it start.

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Has it got a low oil sensor? Most hondas have Try putting some more oil in motor

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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.

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It sounds like you are not producing any voltage. When you start your generator have a volt meter on the generator breaker to see if there is voltage present when the genset is running. Also, check you oil pressure switch, which is near the oil filter.

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