SuzukiSavage.com - Fuel in my Airbox?

Seth C.

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Fuel in my Airbox?
04/07/09 at 08:20:49

Lately when I park at night, fuel is getting into my airbox. This in turn is getting my airfilter wet with fuel. When I open it all up, take out the air filter, let it all dry out, it starts right up and runs great. I ride to work or home (15m) by the time I get there the airfilter is wet again and the bike seems starved for air. So I open it back up, let it dry, and so on. Last weekend I didn't take the bike out. It sat for 2 days and had so much fuel in the airbox it was pouring out when I stood it upright. Seems it might be a simple soulution to replace the airfilter so it can breath but that might not solve the fuel getting in there issue and just waste another airfilter. Anyone experience this? Suggestions? Oh it's a 2001 LS 650 everything else has been great, I love my bike :'(

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« Last Edit: 04/07/09 at 14:17:24 by Seth C. »

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verslagen1

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Re: Fuel in my Airbox?
Reply #1 - 04/07/09 at 08:59:19

Danger will robinson danger!

Fuel in the airbox is not a good thing, especially when it's happening overnite.

Your petcock has failed. This should stem the flow no matter what.

Either the diaphram is leaking and gas is flowing thru the vac line and thank god you are parking uphill cause it could go the other way into your crankcase. Check for gas in the vac line.

Or your float valve has also failed and your carb is over flowing into your airbox.

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Seth C. Full Member Offline Posts: 173 Tucson, AZ Gender:	Re: Fuel in my Airbox? Reply #2 - 04/07/09 at 09:45:09 verslagen1 wrote on 04/07/09 at 08:59:19: Check for gas in the vac line. Thanks for your response. What will this tell me. Petcock or float?
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T Mack 1 - FSO

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Re: Fuel in my Airbox?
Reply #3 - 04/07/09 at 09:55:41

Seth C. wrote on 04/07/09 at 09:45:09:

verslagen1 wrote on 04/07/09 at 08:59:19:

Check for gas in the vac line.

Thanks for your response. What will this tell me. Petcock or float?

Gas in the vacuum line (on the back of the the petcock) will show if the rubber diaphram in the petcock failed (has a hole or tear) and is letting fuel seep pass.

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Reelthing Serious Thumper Alliance Member Offline Fish or ride that is the question Posts: 5397 Houston,Tx Gender:	Re: Fuel in my Airbox? Reply #4 - 04/07/09 at 09:58:00 Fuel in the vac line that runs to the back of the petc0ck will be a failed petc0ck diaphram - likely a really good idea to change the oil any way - unless you're running the bike with the lever set to PRI - this bypasses the vac cutoff in the petc0ck
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Seth C.

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Re: Fuel in my Airbox?
Reply #5 - 04/07/09 at 09:59:34

T Mack 1 - FSO wrote on 04/07/09 at 09:55:41:

Seth C. wrote on 04/07/09 at 09:45:09:

verslagen1 wrote on 04/07/09 at 08:59:19:

Check for gas in the vac line.

Thanks for your response. What will this tell me. Petcock or float?

Gas in the vacuum line (on the back of the the petcock) will show if the rubber diaphram in the petcock failed (has a hole or tear) and is letting fuel seep pass.

Ok, so just leave the vac line connected to the petcock, disconect the vac line from the carb and NO fuel should be in there...right? If there is then the petcock has failed...correct? Again thanks for the help. Much appreciated.

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Seth C. Full Member Offline Posts: 173 Tucson, AZ Gender:	Re: Fuel in my Airbox? Reply #6 - 04/07/09 at 10:18:33 Ok so I checked the vac line (cracked) it was wet with fuel but no fuel in it. I replaced it anyway. The airbox is dry, it started right up. Tonight will tell the tale. I'll ride it home and watch it all night. Fingers crossed no fuel in there in the am. Wish me luck.
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verslagen1 YaBB Moderator ModSquad Offline Where there's a will, I want to be in it. Posts: 28889 L.A. California Gender:	Re: Fuel in my Airbox? Reply #7 - 04/07/09 at 10:35:10 check for fuel in the vac line and watch your oil level closely. you don't want gas in your oil.
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Seth C.

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Re: Fuel in my Airbox?
Reply #8 - 04/07/09 at 10:48:54

verslagen1 wrote on 04/07/09 at 10:35:10:

check for fuel in the vac line and watch your oil level closely.
you don't want gas in your oil.

Sorry, I feel like a noob. We're talking about the same vac line as before right? The one on the back side of the petcock? How would fuel get in my oil? I can see the oil through the window, how will I know if it gets in there?

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Yonuh Adisi FSO Serious Thumper Offline Savage Jedi (Knight) Posts: 3622 Pilot Valley NV, aka Tatooine Gender:	Re: Fuel in my Airbox? Reply #9 - 04/07/09 at 11:06:29 The fuel can get into your oil by flooding the cylinder and seeping past the rings into your crankcase. Drain your oil and if it smells like fuel, then it is in your oil. Your oil level mysteriously rising will also tell the tail.
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Seth C.

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Re: Fuel in my Airbox?
Reply #10 - 04/07/09 at 11:11:58

Yonuh Adisi FSO wrote on 04/07/09 at 11:06:29:

The fuel can get into your oil by flooding the cylinder and seeping past the rings into your crankcase. Drain your oil and if it smells like fuel, then it is in your oil. Your oil level mysteriously rising will also tell the tail.

Ok if there IS fuel in my oil and I change it is there anything else I need to look for? Has lasting damage been done?

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Gort Ex Member	Re: Fuel in my Airbox? Reply #11 - 04/07/09 at 11:36:48 You shouldn't even start that engine if you suspect fuel in the oil. Premature parts wear will be the result, and or even total parts failure. Better to first resolve the problem, then dump the oil & change the filter if you've determined fuel might have gotten into the oil.
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Seth C.

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Re: Fuel in my Airbox?
Reply #12 - 04/07/09 at 11:52:02

Arthur wrote on 04/07/09 at 11:36:48:

You shouldn't even start that engine if you suspect fuel in the oil. Premature parts wear will be the result, and or even total parts failure. Better to first resolve the problem, then dump the oil & change the filter if you've determined fuel might have gotten into the oil.

Ok I'll leave the bike here at work, have the ol'lady pick me up and do the oil change in the am. I think I fixed the issue with the vac line (it was cracked but no fuel in it, changed in anyway as it was wet like it DID have fuel in it). I guess after the oil change and new air filter I'll just need to watch it to make sure it's not the float valve...right? Undecided

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cowspotter

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Re: Fuel in my Airbox?
Reply #13 - 04/07/09 at 12:09:36

I don't think you understand fully. The fuel is in the vacuum line not because the vacuum line is bad, but because the petcock is bad and is leaking fuel into the vacuum line. You are going to need to either replace the petcock with the same petcock, or replace it with the raptor petcock which will be an on/off/reserve style instead of the current reserve/on/prime style.

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Seth C. Full Member Offline Posts: 173 Tucson, AZ Gender:	Re: Fuel in my Airbox? Reply #14 - 04/07/09 at 13:33:02 darn I thought I had it covered. To make things simple, what is the best way to determine if it is a bad petcock or bad float valve? Thanks to all who have helped already.
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