Question about Watts Onan Portable Generator - 4000 , Model# 5500

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

If i jumpper wire to coil & fuel pump engine will run but i would need to jump choke lead also or eng. will load up

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  • mrmoparwins Jun 15, 2009

    If i run a jumper wire to the coil & to the hot side of the fuel pump engine will run but every thing elts

    that needs to be powered up will not be seeing voltage

    what might i test ? the starter switch is builted on a transistor board



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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.

Posted on Aug 25, 2009

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Voltage regulator, oil pressure sensor is a "shut off' condition. if no voltage+no run. seen this a dozen times.

Posted on Aug 29, 2009


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To test if fuel is pumping to the carb, unscrew the incoming fuel line. It will be the one with a bulky silver connection attacted to a small tube leading into the front of the carb. Place a bottle over the end to catch gas. Have a buddy turn the engine over. Since the fuel pump is manual it should squirt gas out. If it does then you're ok. If not, you need a new fuel pump.

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Please stop using the starting fluid, it is terrible for your engine- use choke cleaner if you need to do this in the future again. you can run it on choke cleaner indefinately if needed.
It sounds like your fuel pump quit on ya. When you turn the key to the "run" position do you hear the pump run in the tank for 3-5 seconds? you should. The fuel pump is in the gas tank and the tank has to be removed to acess it.
you can remove the coil wire from the coil and check to see if the coil is firing a spark. crank the engine with the wire off. make sure there is no starting fluid or choke cleaner fumes around before you do this-k? Carefull not to let it shock you. if it is sparking then you should check the fuel pressure. it should be 60psi while cranking the engine. you will need a fuel pressure guage to do this.
Good luck........Scott

Sep 21, 2008 | 2000 Oldsmobile Bravada

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