250 cc plastic fuel device leaking By grbell1834 (Read 1,701 times)

[grbell1834]

I solved the brake issue and the cooling issue. Now putting it all back together, I'm finding this plastic fuel basin leaking. There is this device underneath the seat, and located near the front, which has a removable cap. There are (3) small lines all connected to the fuel system. This bowl normally fills up with some fuel. There appears to be a overflow thing inside the bowl, as there are these internal plastic posts, that are connected to the three lines underneath. Now, I'm not sure if I put the three lines back on their respective posts or just what, because now it seems the fuel fills the whole bowl, and with accelerating the engine, leaks out the cap. There is an o-ring on this cap that may be worn out. I checked the parts guy in Elgin and they don't seem to carry this part. Might you have a diagram on this and where the three lines are suppose to go? I'm not so sure the engine would run if I got the hoses mixed up. Two of them appear to go to the carb. I can't follow the middle one, but heads back to the front of the bike and most likely to the gas tank? I either got see if I have the hoses on right or am in need of this part, or at least an o-ring for the sealing the cap. Suppose I could take a picture if you need?

[justbuggin2]

can you post a pic of it so we can see what you are talking about

[JR]

Please do and I'll start on the line diagram to it.

JT

[grbell1834]

I'm gonna try the following firstly. I've traced the (3) tubes and I believe now I have them correctly mounted on this plastic bowl device. There are (3) tubes teminated on the bottom of this bowl device. This is small fuel line stuff, either .25 in or 5/16. Say looking at it from behind and call them left, center, right. The left one comes off the this round pan cake looking device, which has an imput from the gas tank. The right one, exits the bowl and goes to the area of the carburator. Looking inside the bowl, both the left and right are are flush inputs with the bottom of the bowl. The center post sticks up an inch or so inside this bowl, and appears to act as some sort of overflow. The exit tube on the center post appears to head to the front of the bike and maybe back to the gas tank, as I cannot see far enough as to where this terminates. I'm wondering why the gas fills up in bowl, obvioulsy over the post inside the overflow, fills the bowl and wants to leak at the cap.
Regardless, today I found the same size o-ring as used on the cap, except a hair thicker, and (3) compression type clamp fittings from the hardware store, that I'm going to install, and see what happens with anymore leaking. I can't say I'm anomored with the Chinese and their use of these little cheap ass spring type compression fittings on anything requiring a coolant, fuel, or vacuum connection. Todate, I've relplaced all the coolant fittings with positive ring type clamps. I'm going to try to beef up the connections and see if there are anymore leaks and report back.

[JR]

I think I know what you have now. The Evap Emmision Control Cannister, pages 27 and 28 Helix Manual Part 1

thescooterprofessor.proboards.com/index.cgi?board=ncmanuals&action=display&thread=415

It's not supposed to have gas in it at all if this is indeed what you've got.

JR

[grbell1834]

If you would go back to my thread started on 250cc water cooled problems, the fourth picture down shows this white plastic device. In this picture you see this right adjacent to the container of Prestone on the floor with the funnel in it. Are we talking about the same thing? Always seems to me that there has been fuel present in this bowl. In taking this appart, the center tube is partially broken on the bottom. I've tried to glue with super super special glue, and have it clamped right now. If this is what you are talking about, and my glue job doesn't work, do you know where I can get one of these?

[alleyoop]

JR,
This is the piece he is talking about:
Alleyoop

[JR]

Looks like it for sure? But I don't have a clue to what this is?

[alleyoop]

What this is? Looks like it for sure?
SAY WHAT!!! You have to get off eating raw corn
Alley

[JR]

no No NO! on raw corn, full of sweet potatoes! What I meant to say is that is the piece he's talking about in his description on the photo he mentioned. As your arrow shows it's by the jug with the funnel in it.

Now I still don't know what this white thing is. Heck from the picture it looks kind of like a fuel filter with one end broke off.

Maybe a close up?

JR

[cruiser]

This looks like an evaporative emission purge control valve. It feeds gas fumes which are stored in the evaporative emission canister to the carburetor so they can be burned and not go into the atmosphere. There should be no liquid gasoline in this part. Not a very common replacement part.

[JR]

Well I said evap cannister but the ones on my 250's are black with 3 hoeses hooked up, one to vacuum, one to the tank neck and one larger hose to the air filter intake.

Also no gas in them. I've heard when you fill the tank up all the way it can make gas go into them but if they are working correctly when you start the scooter it will purge just like the stored fumes they get when the scooter sits?

Also if you had the vacumm line and the tank line reversed it would make sense it wouldn't work at all?

When he comes back he can tell us if it has 3 lines and it sounds for sure it's broke.

[alleyoop]

He already mentioned that it has 3 hoses going to it. I have seen those on some other scoots as well.
Alleyoop

[JR]

Hold the bus!! Hold the bus!! Got it figured out!

thescooterprofessor.proboards.com/index.cgi?board=engexh&action=display&thread=105

Purge Control valve, works with the cannister. Now got to find where to buy one?

JR

[cruiser]

Refer to reply #10. Like I said - not a common replacement part.