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Onan 155.0DFE-15R Wire numbers for low oil pressure and pre low oil pressure

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Why does it run only in the start position?


Hello Martin, Your generator might have a low oil pressure shutdown switch. First check the oil level. If oil level is low, fill oil to proper level. If oil level is fine, I would install an auxiliary oil pressure gauge . If oil pressure is normal, I would change the oil sender unit. If oil pressure is low, I would change the oil pump.

Aug 03, 2015 | Onan Cummins 4.0 KY-FA/26100 RV QG 4000...

2 Answers

Onan generator dies after 2-3 hours of running , wiil not restart rigt away wait 10 minutes starts no problem then runs for 15 minutes shuts down and keeps reapeating on 15 off 10


This sounds like overheating. These small generators don't have overheating protection, but if a low oil pressure or low oil level is present it may be the reason for stopping.

Check the oil level in the starting conditions and again when it stops. It may become under the "stop" level and after some time the precipitated oil has reached the "start" level. The same may be with oil viscosity and oil pressure.

Try to add some oil or change the oil with bigger viscosity.

Jul 07, 2010 | Watts Onan Portable Generator - 4000 ,...

1 Answer

Oil light blinks on and off could pressure switch be bad if so where is it located on a 2000 ford windstar 3.0


Oil Pressure Switch Operation:
00134_oil_pressure_switch_gauge.jpgInformation relay unit for the indicator light or gauge on instrument panel. It contains a diaphragm that responds to changes in oil pressure. When the oil level is over a pre-set limit, the diaphragm opens the switch, turning off the light. When level is below the pre-set limit, the dash light comes on. In later model cars, if the oil pressure drops, the switch turns off the fuel pump, to stop the engine and limit damage to internal parts. Oil pressure switches can be grouped into two categories, units for electrical gauges and for mechanical gauges.

Oil pressure can be checked at the sending unit passage with an externally mounted mechanical oil pressure gauge. To get accurate results from the test, make sure you follow the manufacturer's recommendations and compare your findings to specifications.
Testing the Oil Pressure Gauge
  • Test the gauge by grounding the wire that leads to the sending unit on the block.
  • When the wire is disconnected from the sending unit with the key switch on, the needle on the oil pressure gauge should be either all the way high or all the way low. Grounding the wire should make the needle move to the opposite side of the gauge from where it was before the wire was grounded. If the vehicle is equipped with an oil pressure light, touching the wire to ground and then removing the wire from ground should turn the light on and off.
  • If either happens, the gauge and wiring are good and the sending unit is at fault.
Testing Oil Pressure
Pressure can be tested by temporarily installing an oil pressure gauge in place of the sending unit. Before testing, look up the oil pressure specifications for your vehicle in the appropriate service manual.
  • Bring the engine up to operating temperature.
  • Now shut the engine off.
  • Locate the oil pressure sending unit; usually it is on the lower side of the engine block.
  • Disconnect the wire from the sending unit and use an open ended wrench to remove the sender. Using pliers can damage the unit.
f43-19.jpg An oil pressure sending unit is removed with a special socket. Courtesy of Chrysler Corporation.
  • Tighten the oil pressure test gauge into the hole in the block where the sender was removed.
f11-15_3184.gif Measuring oil pressure. Reprinted with permission.
  • Check the engine's oil level and fill, if required.
WARNING Be extremely careful when working near a running engine. Always wear safety goggles or glasses with side shields when working around moving machinery and be sure that your clothing is not loose.
  • Now turn the engine on and check the oil pressure on the gauge.
    • Watch as the engine warms to note any excessive drops due to temperature.
    • Make sure the engine speed is set to specifications for testing pressure.
    • If necessary, us a tachometer and adjust the engine idle speed.
  • Record the measured oil pressure, then turn off the engine.
  • Compare the test results with the manufacturer's specifications.
    • If the oil pressure is within specifications, this shows that the oil pressure sending unit may not be working correctly.
    • In many cases, replacing the oil sending unit will correct the problem.
  • After the test is complete, reinstall the oil pressure sending unit, start the engine, and confirm there are no leaks.




Nov 17, 2009 | 2000 Ford Windstar

1 Answer

Gen starts and runs with rocker start button pushed in..stops....


Cleaning the brushes is used to address an AC output problem. If the generator would run for a few seconds after letting go of the button, then this might apply.

But, since yours is dying as soon as you let go of the button, that tells me that you are probably looking at a low oil condition, or a sensor / sending unit failure for oil level.

Without spec number, hard to remember if the sending unit is for low oil pressure, or low oil level. Either way, the ignition is being grounded. First, double check your oil level, make sure generator is reasonably level. If still not resolved, then locate the sending unit, and remove the wire that is on the end of it. There should be a connector either a few inches from the sending unit, or a few inches from the control board (coming from big white plug). Disconnect at either place. Try starting again. If it starts this time, double check oil levels. If those are fine, then sending unit has failed, or oil pump (if pressure unit) has failed. In either case, don't run for very long until sending unit is replaced, just in case.

Aug 24, 2009 | Watts Onan Portable Generator - 4000 ,...

2 Answers

Starts and will run as long as i hold in start button


Your oil sensor is detecting a fault condition, or has become faulty itself.

Normal operation is that the rocker switch breaks the wire going to the sending unit so that engine will try to start. But, once started, if fault exists, the sending unit disables ignition.

Depending on model, the sending unit may detect low oil or low oil pressure. Either way, there is a single wire going to the sending unit, typically located near the oil filter (if equipped). Follow the wire, and you will come to a connector inline that you can pull apart. If engine runs now, and you are sure that you have proper oil pressure and level, then sending unit is bad. Don't run engine without making sure you have proper oil though. You can burn it up in short order.

Jun 14, 2009 | Watts Onan Portable Generator - 4000 ,...

1 Answer

Onan p224 engine


gonna have to go to an onan dealer or repair place.

Jun 16, 2008 | Karcher 2500 PSI Pressure Washer

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