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Old 09-27-2011, 03:58 PM   #1
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What is it?

Started up my generator the other day and found a puddle of gas on the floor. Lookd at the Genset and saw a leak from a little brass gadget about the size of a shotgun shell with a fuel line in the bottom and screwed onto an elbow at the carb.

Called up and ordered a new fuel filter....Wrong! The fuel filter is a cannister about as big around as a cambells soup can and half as high.

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Onan Marquis

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Its just behind the air filter

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Here is a closer view. Fuel "mists" out at the base of the hex head.

Anybody know what it is?

Bill
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Old 09-27-2011, 04:05 PM   #2
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looks like a check valve to keep the fuel in the carb when not running.
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Old 09-27-2011, 04:10 PM   #3
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Don't know, was going to guess fuel pressure regulator. Might have to go to the Onan site here Cummins Onan

Have some spec numbers off of your generator, and get a manual. Good Luck.
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Old 09-27-2011, 04:16 PM   #4
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Looks to me like an additional fuel filter added on.
older 2 barrel fords used this on cars and trucks. By older I mean 70's and 80's
I bet it about 1/8 inch pipe thread.
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Old 09-27-2011, 04:19 PM   #5
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Back in the day alot of carbrated engines had those and they were fuel filters used as a secondary filter to the paper filter made of stintered bronze. You might be able to find them at a small engine repair shop.
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Old 09-27-2011, 04:38 PM   #6
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It does look a lot like this: Cummins Onan RV Fuel Filter 149 2341 01 for Marquis BGM NHM - Norwall PowerSystems

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Old 09-27-2011, 04:50 PM   #7
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yes it does look like an old style fuel filter that srewed onto the carb and had either a paper filter or a porous stone element. Good work everyone!
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Old 09-27-2011, 05:09 PM   #8
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Would not think it came from factory that way. Not with that hose clamp on it.
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Old 09-27-2011, 06:22 PM   #9
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Someone replaced the filter,you can see the marks on the nut part.It came from the factory with a crimpted clamp on it,that you can get at a parts place.
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Old 09-27-2011, 07:09 PM   #10
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WOW!

You guys nailed it, especially FRANKM. The item was probably replaced sometime since 2005 hence the screw type hose clamp. The marks on the brass are mine as I removed the item to examine it for cracks after I tried to tighten it.

Thanks a bunch.

Bill
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