Question about Watts Onan Portable Generator - 4000 , Model# 5500
If it starts when you add fa fuel source to the carb throat it is not the oil level sensor. The oil level sensor and generator fault circuits all shut off the spark. You have a fuel blockage most likely in the carb float bowl caused by debris / corrosion that has made its way into the fuel jet orifice located inside the hole that the fuel bowl nut threads into into. Get some carb cleaner and shoot into the hole that the float bowl nut threads into. Make sure you dump the fuel float bowl contents. With the bowl removed use a spray can lid or something similar to check fuel flow. Fuel selector on float down you should have fuel flow. Genyly lifting the float to level the fuel flow should stop.
If you do not have any fuel flow then there is a problem with the fuel supply. Remove the fuel supply hose at the carb. Feul should flow freely. Good flow from hose = float needle problem.
No flow from hose = check fuel filter and fuel tank outlet / fuel selector for debris.
If you have checked all of the above then jumper pins 5 to 9 on the main board. You should hear the fuel pump running. If you don't hear it running then the fuel pump has probably failed.
Reconnect and re-install everything and fuel leak test before starting.
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Posted on Sep 03, 2010
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Posted on Jan 02, 2017
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