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

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4000 onan will start and run 5 to 10 minutes and stops . Will start back up and will do the same.Has new oil new air filter new fuel pump and filter carb kit . new battary . new plug . Help

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Check oil sensor and oil level check tank for sediment and lines and crb for sediment also coil maybe going bad!!! :)

Posted on Jul 02, 2009

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Onan generator microquiet 4000


Check the pickup tube in the vehicle, the fuel pump is suspect. If you check the fuel pump pressure and it is ok, then try installing a test check valve between the fuel delivery hose to the generator. If it solves the problem the pump is losing it's prime internally, so replace the fuel pump.

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If it stops after 5 minutes whether under load or not, and assuming the air filter, plugs, and fuel filter are new and or clean. The fuel pump is suspect. If it is in a motorhome try conencting it to an external fuel source that is at the same height as the generator. Then higher than the generator. If the problem persisits replace the fuel pump. Or just check fuel pump pressure with a gauge. BE CAREFUL do not use an automotive fuel pump Onan have special low pressure pumps, so use OEM part

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Onan Generator stopped working in motorhome because the gas got too low. I blew out the front fuel filter,changed oil and filter, air filter, one spark plug and now it won't start. Is there a fuel shut...


Yes it wil not let you run your motorhome out of fuel they set it up that way so you dont strand yourself you may have a air bubble in the fuel line to the generator try blowing air generator fule line back into the tank

Jan 31, 2010 | Watts Onan Portable Generator - 4000 ,...

1 Answer

Onan microquiet 40000 in toyhauler ,runs for 15minutes and off


Take and locate the oil pressure switch and try bypassing it,if that aint it check fuel filter and pump.

Jul 22, 2009 | Watts Onan Portable Generator - 4000 ,...

2 Answers

Onan 4000 start good runs only ten minutsand shuts down,starts up


First locate the oil pressure switch and see if you can bypass it,then see if it runs. If not check the fuel filter and fuel pump,make sure solonoid for fuel pump is kicking on.

Jun 07, 2009 | Watts Onan Portable Generator - 4000 ,...

2 Answers

ONAN 4000 RUNS FOR ONE HOUR AND DIES--ANY IDEAS WHY?


does it have original oil in it? if so they use a lighter weight oil than recommended for engine break in. change your oil and filter and see if that doesnt solve it.could be thinning out loosing pressure when hot. i have seen this beofore.. :)

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

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