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

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Gas leaking from behind carburator on wen 5500 genrator

Generator has been sitting a while drained fuel from tank do not know i replaced filter correctly it will start but fuel pours from behind carb

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Posted on Jan 02, 2017

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SOURCE: I have an onan 5500 gas generator that wont start

What is the model? Chances are the carb needs cleaning or replaced.

Posted on Sep 28, 2009

  • 9 Answers

SOURCE: Onan Generator stopped working in motorhome

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

Posted on Feb 01, 2010

  • 1 Answer

SOURCE: The MOTOR on my Wen Power Pro model 5500 runs

The brushes need to be filed smooth or replaced. 15 minute job, remove 2 bolts on the generator cover ( side opposite the pull start ). Remove 2 more bolts holding a black plastic thing about 4 inches long on the left. Behing that piece, there is 1 bolt holding in the brushes ( red and white wire attached ). Remove the brushes and if they're not smooth, file down and reconnect everything. I was done in 15 minutes in the middle of Maine woods thanks to my Leatherman.

Posted on May 15, 2010

  • 1902 Answers

SOURCE: our onan generator ran out of gas. we refueled but

No, not the filter, you will need to try to prime the carb better then with starting fluid, pour some gasoline down the carb, you may have to do this a few times, but everything will fire back up again once you get the air out of the system

Posted on May 25, 2010

  • 142 Answers

SOURCE: Onan Marquis 5000 generator. No gas going to the

12 V going to the pump, but is it turning (do you hear it running). If not change it.

Posted on Jun 13, 2010

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It sounds like the pickup tube in the tank is blocked. Try blowing air back through the fuel petcock into the tank- you may need compressed air to get enough pressure, but that shuld blow out any obstructions.They would still be in the tank though and could cause a problem again.

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My WEN 550 generator has spark, but won't run. I have used some started fluid and it will run a couple of seconds only. I took the carb. apart and cleaned the needle valve, this did not do any good. Still...

I suspect that your carburetor is gummed up by the alcohol laced fuel that you are forced to use. If you leave that fuel in your machine for 3 months or longer. the alcohol absorbs water that will form a jelly like gunk that will clog all of the ports as well as your fuel filter. What happens is the alcohol evaporates and leaves behind the water that mixes with the other additives in gasoline. You are going to have to clean your carb, and fuel filter. Drain all of the old gasoline out. Put fresh in and mix a little SeaFoam or other gasoline additive. The SeaFoam will help dissolve the gunk, and maybe you can get it started to run to see if it will clean itself out. You may still have to dismantle the carb and clean. At the end of the use, drain all of the gasoline out of the tank and leave it dry for storage.

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Honda eb3800x will not start. I started and ran it in June 2010 with no problem. Will not start today 9/2/2010. Checked oil, checked spark plug, drained all gas and put new gas. Carb getting fuel....

the worst thing for generator and compressors are to sit up. when you do sit them up put stabil in the gas. run it and then run the gas out of the carburator. now, make sure the gas in the tank is good and has no water or trash. check the fuel line that it is in good conditon and not plugged. pull the carberator and clean varnish out and clean jets. soak it over nite in varsol or parts cleaner. check to see if you have a low oil shut off. oil level must be correct. check your exhaust to make sure it isn't plugged. some have a little screen that get coated with carbon and won't let it exhaust.( fuel in, spark, exhaust out)

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What steps do I take to get a Yamaha EF1000 gas powered electric generator going again after it has been sitting around for years with gas in the tank? How do I drain the gas from the tank and carburater?...

You can disconnect the fuel line from the carb and drain the gas. It would be even better to then remove the fuel tank. If this is the generator with the large plastic tank, quite often the rubber gromet in the bottom of the tank with shout off vavle in it will deteriorate into a black gooey mess, and leak. If so that will have to be replaced. Clean inside of tank with fresh gasoline. Remove bowl from carburator and clean throughly. If you know how to work on engines, remove the carburator and clean throughly, notice how all springs and linkage were connected before removeal. Be sure all passage ways in carb are clean. Always use sta-bill in your gas.

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It started but when i pluged in ti it it quit. has not started since. checked plug and it was loaded with gas. install new plug and tried. check spark and it appears eratic. pulled air filter off and it is...

sounds like the float is stuck, how long has it ben setting around? try some carburetor cleaner. spray the carburetor down. empty the fuel tank put fresh fuel with fuel treatment. you may have to remove the spark plug, pull starter string a couple of times to clear out cylinder make sure spark plug is dry put back in and try to start the generator.

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I've got a Power Pro By Wen Power Model 9000 16 HP Generator - kicks on with one pull however shuts down after about 10 min of operation. I've changed the oil and cleaned the air filter. Any other...

Check the gas cap. There is a vent to allow air into the fuel tank as the fuel is drawn out. If this vent becomes clogged, a vacuum can be formed in the tank. This can prevent gas from flowing to the carburetor.

Listen carefully when you remove the cap. If you hear a "whoosh," there likely was a vacuum.

Oct 17, 2009 | Watts Onan Portable Generator - 4000 ,...

1 Answer


Gasoline goes stale after sitting a while and makes starting hard. Three years worth, it's more like jelly! You need to clean the tank, lines, filter, and carburetor. Run it for a while on a little fresh fuel after cleaning, then let it run out of fuel. That will remove most of the fuel from the carburetor. When you want to run it again, add whatever fuel you need, but allow it to run dry again. That's not prefect, but workable.

Aug 19, 2009 | Electrical Supplies

2 Answers


All generators need to be run once a month. All things from the tank to the and including the carb will get gummed up with dried out fuel. I have a whole house generator and a 5500 watt gen set on my motor home. I keep fresh fuel in the stand alone house generator in California in case of a bad earthquake. I drain the gas after every run and keep all vehicles full of fuel just in case. Run gen sets at least once a month or pay pay pay!!

Apr 05, 2009 | Watts Onan Portable Generator - 4000 ,...

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