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The plug on the hose under the engine

R

Ruger

Joined Aug 2011
532 Posts | 24+
Northern Nevada
On my 2011 FE570S there is a rubber hose that dangles down under the engine. It is not mentioned in the owner's manual, and it is not shown in the parts manual. My dealer tells me that it serves as a reservoir for fuel that isn't used by the engine, and that the plug needs to be pulled periodically to let it drain.

I've lost the plug somehow. Can anyone tell me whether that's important? Will it suck up water during a stream crossing, or will it suck up air and make it run lean? Can I leave it off, or is it wise to replace it?
 
Please, somebody here has GOT to know something about this!
Thanks in advance for any info or advice.
 
Does it have any vacuum? If so, then just buy a plug and put it back... Auto parts or hardware store.
 
My 570 has no such pipe. "Serves as a reservoir for fuel not used by the engine" ??? Eh?? Not sure what the hell that means. If the bike had a carb I'd say a vent or overflow pipe but not with FI. Where's the other end of the pipe connected? A picture paints a thousand words.
 
If you follow the hose upward, it comes to a t-fitting. I think that the forward run of hose from the T-fitting goes to that peculiar gadget just forward of the exhaust header on the right side of the cylinder head. The aft run of the hose from the T-fitting goes to a canister shoehorned under the left rear fender.

The dealer told me that when you dump the bike, the fuel pump will continue to run for a few beats and that the fuel will go to that hose. Sure enough, when you pull the plug (assuming it's still there, of course) there's fuel in the hose.
 
I'm only guessing here but does you bike have all the emmisions c**p on it? On some emmisions equipped cars/bikes the fuel tank breather does not vent straight into the atmosphere but instead vents through a charcoal filled canister which could be what is behind your fender? The small amount of fuel that comes out of the drain pipe could be condensed fual vapour?? Does your tank cap have a breather pipe that vents straight to air?
 
Yes, I think you've got it, Pegscraper. I didn't even know that there was an evap canister on the bike, but it's there under the left side rear fender. The hose under the bike runs upward to a tee-fitting. From the tee, the line running forward goes to the fuel cap on the tank, and the line that runs aft goes to the canister. The fuel cap does not have a hose that runs to open air, it runs to the canister via that tee-fitting. The canister is also plumbed to the peculiar valve that is attached to the right side of the cylinder head just forward of the exhaust header.

So the question remains, is the cap on the hose under the bike an essential part or is it superflous?
 
Ruger said:
Yes, I think you've got it, Pegscraper. I didn't even know that there was an evap canister on the bike, but it's there under the left side rear fender. The hose under the bike runs upward to a tee-fitting. From the tee, the line running forward goes to the fuel cap on the tank, and the line that runs aft goes to the canister. The fuel cap does not have a hose that runs to open air, it runs to the canister via that tee-fitting. The canister is also plumbed to the peculiar valve that is attached to the right side of the cylinder head just forward of the exhaust header.

So the question remains, is the cap on the hose under the bike an essential part or is it superflous?
Click to expand...

To answer your question simply, YES it is important.

That short piece of tubing is as you found out a small reservoir for fuel in the vacuum line between the gas tank cap vent and the charcoal canister. You can find a picture of this on page 32 of the parts manual.

People who have this bike, and have experienced excessive popping on decel, simply have plugged off the vacuum supply for this system that is located on the valve cover.

If you leave this line unplugged, it will be pulling dirt straight into the evap canister and eventually render it useless.
 
Dale,

Included with the owners manual and took kit, my bike came with a plug to eliminate the valve attached at the cylinder head. When you say, "People who have this bike, and have experienced excessive popping on decel, simply have plugged off the vacuum supply for this system that is located on the valve cover," you're not referring to that, are you? I think that plug is provided to modify the bike for off-road competitive use.
 
Ruger said:
Dale,

Included with the owners manual and took kit, my bike came with a plug to eliminate the valve attached at the cylinder head. When you say, "People who have this bike, and have experienced excessive popping on decel, simply have plugged off the vacuum supply for this system that is located on the valve cover," you're not referring to that, are you? I think that plug is provided to modify the bike for off-road competitive use.
Click to expand...

That is exactly what I am referring to. By installing that plug your bike is still EPA off road legal, just not "street legal".

I have spoken with several folks who have taken their 570 S and installed this plug, and reflashed the ECU for "off road competition use" and the results were night and day. No more popping on decel, and much better starting.

Either way, you need to have the plug in the 220mm drain tube so that you won't be sucking dirt into the evap recovery system. As every time the ECU tells the valve to open and draw vacuum from the valve cover, you will be drawing dirt in the canister, eventually it will get plugged up and it along with the valve will probably be rendered useless. That is why if you put the plug at the cylinder head you eliminate all the vacuum for the evap system when you are using it for "off road competition" to preserve that system for road use. Get it?
 
Yup, sure do.
I didn't know that there is an off-road competitive ECU option. Do you know how this is done?
 
Ruger said:
Yup, sure do.
I didn't know that there is an off-road competitive ECU option. Do you know how this is done?
Click to expand...

Yep, you take it back to the dealer and tell them you want the "competition map" installed on your bike, takes about 5-10 minutes for them to do it.
 
Sorry to jump in late on this one and you may already have figured this out, but to clarify, I think Ruger and DaleEO are talking about slightly different things. The plug that comes with the bike replaces the valve at the cylinder head like Ruger said and this will eliminate the popping on deceleration like DaleEO said. This, however is not connected to the other hose you are talking about that you lost the plug for. The hose coming off of the valve is much larger and just goes up about 9 inches just under the tank and ends with a mini air filter looking device... The hose you lost the plug for under the engine connects to a brass fitting, which is also on the right hand side of the cylinder head. Personally, I pulled this off and removed the brass fitting and replaced it with a stainless steel bolt and a brass washer. Here is a link to the thread where I include more information on this. I hope this helps!

viewtopic.php?f=9&t=14513&start=15&hilit=smog
 
I thought I had this well understood. Now I'm utterly confused.
At first I thought I'd wait until the warranty ran out, then I thought I'd go ahead and do it since the manufacturer supplied the plug with the bike. Now I'm quite sure that I don't know how to proceed with this modification, and am reluctant to do anything at all.
 
Go here:

http://www.ktm-parts.com/mm5/merchant.m ... =OEMFINDER

put in your brand, year and model and download the parts manual.

look on page 32-33 for a single line of the vac/evap system, it's very simple to understand. And you will see the drain you were talking about.

Look at the fitting that came in your kit and ask yourself, where does this go? I bet it goes directly into the valve cover. If it doesn't let me know.

Put the plug in there, and tie the hose up out of the way. Run a new gas tank vent line down along the frame to the skid plate and you're done.
 
Brass fitting and hose?
Evap canister?
Electrical connections?
It seems a lot more complicated than pulling the valve thing off the head, putting in the plug, and making a new drain line for the gas cap. A step-by-step with photos to match would be very helpful to all if you could manage it. It would help ME immensely!
 

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