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Old 12-29-2014, 08:01 PM   #1
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Question about changing fuel filter on Onan BGE series gen set

Hello
I have an 96 Onan Emerald 4000 BGE series Gen Set and I am going to replace the fuel filter and have a question.
Is the fuel system under pressure? Can I simply disconnect the fuel line and remove the filer or do I need to depressurize it?

Thank in advance!
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Old 12-29-2014, 09:08 PM   #2
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I'd have some rags to catch the fuel but no the fuel line isn't pressurized the way it would be of it were fuel injected.
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Old 12-30-2014, 11:50 AM   #3
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Thank you Oldtoolmaker. I figured as much but wasn't sure if the Gen fuel line was tapped off the main fuel line for the engine which is pressurized.

Happy Holidays!
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Old 12-30-2014, 02:26 PM   #4
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Thank you very much. But, if you think about it that line can't be pressurized. Onan is clear that you should only use Onan fuel pumps because aftermarket pumps may over pressure the fuel system.

I have the '97 Emerald+ in my '86 Rockwood and the Onan runs about 20 hours each week.
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Old 12-30-2014, 03:25 PM   #5
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I would suggest that you add a small gas shut off valve ahead of the filter. Available at Tractor Supply or hardware store of your choice. Allows you to shut the gas supply off when you put it in storage and burn the remaining fuel in the bowl to minimize varnishing of the needle valve.


Pete
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Old 12-30-2014, 07:04 PM   #6
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[QUOTE=purduepete2;2362956]I would suggest that you add a small gas shut off valve ahead of the filter. Available at Tractor Supply or hardware store of your choice. Allows you to shut the gas supply off when you put it in storage and burn the remaining fuel in the bowl to minimize varnishing of the needle valve.
[/QUOTE

Well this is an interesting idea. I do run the gennie monthly and I am under the impression this is often enough to prevent varnish of the carb.
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Old 01-01-2015, 02:05 PM   #7
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it is not under pressure.
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Old 01-02-2015, 03:49 PM   #8
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[QUOTE=Rockyroad;2363193]
Quote:
Originally Posted by purduepete2 View Post
I would suggest that you add a small gas shut off valve ahead of the filter. Available at Tractor Supply or hardware store of your choice. Allows you to shut the gas supply off when you put it in storage and burn the remaining fuel in the bowl to minimize varnishing of the needle valve.
[/QUOTE

Well this is an interesting idea. I do run the gennie monthly and I am under the impression this is often enough to prevent varnish of the carb.
That's the point, If you add the valve; you won't have to run the generator for 30 minutes every month.

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Old 02-18-2015, 08:45 PM   #9
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I have a 4kw 2003 Onan. It is hard to start, takes lots of cranking but does finally start. Suggestions as to why? I prime it, at least I hear it clicking.
thanks
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Old 02-19-2015, 02:52 PM   #10
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I have a 4kw 2003 Onan. It is hard to start, takes lots of cranking but does finally start. Suggestions as to why? I prime it, at least I hear it clicking.
thanks
dan
Dan; Is it always hard to start or only after its been sitting for a while. For example, once you get it running if you let it sit for a day or two will it start right up or does the problem only show up after the gennie sits for a long while?
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Old 02-20-2015, 05:59 AM   #11
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ok. that makes sense. Yes if started once, it does start sooner on subsequent starts. Just not used to a motor being so picky about starting. Thanks for the come back. dan
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Old 02-21-2015, 12:31 PM   #12
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ok. that makes sense. Yes if started once, it does start sooner on subsequent starts. Just not used to a motor being so picky about starting. Thanks for the come back. dan
Dan. I run mine monthly and it does take a couple extra seconds to start the 1st time. But, if I start it a couple days later it fires right up.
I am no mechanic but my guess is whats happening is the fuel in the carb has started to evaporate and it takes a bit more umph to get back in there.
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