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Old 04-08-2010, 01:54 PM   #1
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Onan 5500 Wont start

Started and ran momentarily then quit, I hear the fuel pump when the prime button is held down and it sounds too loud. The start light is blinking some code. 4 blinks then 5 blinks? anone have an idea of what is going on here?
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Old 04-08-2010, 02:34 PM   #2
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Originally Posted by Mortgagehomes View Post
Started and ran momentarily then quit, I hear the fuel pump when the prime button is held down and it sounds too loud. The start light is blinking some code. 4 blinks then 5 blinks? anone have an idea of what is going on here?
Please check your oil level just to humor me.
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Old 04-08-2010, 02:43 PM   #3
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Will do, I will let you know what I find.
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Old 04-08-2010, 03:31 PM   #4
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Fault code 45 is a speed sensor code. It may not be sensing any output. Check slip rings for corrosion.

Okay, I'll ask. Do you have more than 1/4 tank of fuel?
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Old 04-08-2010, 06:10 PM   #5
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Mine doesn't show any codes but does the same thing for about 5-6 times before it stays running. Full tank of gas, oil good, just serviced in December. Any ideas?
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Old 04-08-2010, 08:52 PM   #6
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The "fuel pump sounds too loud" is the dead giveaway, the diaphragm is weak, might be time for a new one.

For what it's worth, I keep a $18 electric fuel pump (from Checker Auto) with several connectors/adapters etc. handy just for testing, it's great for troubleshooting or for temporary use to save the weekend...
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Old 04-10-2010, 01:25 PM   #7
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Check for small leaks in the hoses. these pumps are low pressure (~3.5 PSI) and older hoses develop small cracks that allow air to enter the line. Mine would work fine with a full tank, but become hard to start when down to half a tank than then cut out completely well before reaching 1/4 tank. Replaced a short section of hose and everything was cool again - never did identify an actual leak.
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Old 04-12-2010, 01:02 PM   #8
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OK, so far fuel is just under half a tank, and Oil level is in range. I dont know anything about the slip ring mentioned. How is that checked? I am going to check out the fuel pump this weekend the louder pump sounds like a possibility.
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Old 04-18-2010, 10:06 AM   #9
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OK I hate to admit it but it is operator fatigue. Motorhome was parked with front slightly up hill. Even though the fuel guage read just under half a tank the pick up for the gen set is in the front of the tank. The quarter tank rule only works out correctly when the motorhome is level. :-(
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Old 04-19-2010, 03:00 PM   #10
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had the same problem replaced small section of hose and the world is right again.02 Bounder.
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