My MC 54 250B, 2008 model just does not run much at all. By bobf (Read 3,859 times)

[Alleyoop]

Draw it put it on your desktop and then LOOK ON THE BOTTOM of your EMPTY POST that you will insert the pic you will see Next to Spell Check it says Insert Image click on that then it will go to your computer you find it click on the drawing and click on LOAD and it will insert it in your post. Really easy as long as you get it on your computer. What I do is paste the pic or whatever on my desktop that way it is easy to find.

scooterdoc.proboards.com/thread/11566/easy-picture-posting?page=1&scrollTo=103740

Well the Vacuum should be coming from the motor then that SAUCER NEEDS vacuum and the other thing that really needs Vacuum is your fuel pump So it is either connected wrong or connected to the wrong thing for it to cause it to die when you cover it up.

Alleyoop

[bobf]

OK, working hard to catch up with the current stuff - like photos, sketches, etc.

[Alleyoop]

Ok There should be a HOSE FROM THE TANK TO THE FUEL PUMP is there one OR is what you drew correct.

[Alleyoop]

Ok I assume that hose comeing from the fuel tank is on top and it is a VENT HOSE. So the canister where it used to go disconnect and just take the hose from the tank and zip tie it up higher than the tank.
Then take the hose from the saucer and go straight to the "Y" and give that a shot.

Your taking that little canister between the tank and the carb and eliminating it.

Reason the motor stops when you plug up the saucer hose is the TANK NO LONGER VENTS NO GAS FLOWS.

See the "Y" connector Turn that around the SINGLE POINT goes to the hose from the manifold and then connect the other two vacuum hoses to each end. That way BOTH fuel pump and ACV will get good VACUUM to operate correctly.


WHAT IS THAT BLACK LITTLE THING AFTER THE TANK? That also should be elminated IF that hose is from the TOP OF THE TANK which is the VENT HOSE.

Many have trouble with the EVAP system they put on these scoots they cause nothing but problems in your case it was sucking fuel because fuel got into the canister which is a charcoal canister and now it is soaked with fuel.

[Alleyoop]

So you are confident what I am saying do this:

Take the Saucer Vacuum hose off the "T" and disconnect hose going to the "T" from the "Y" and connect the SAUCER hose onto the "Y". Now you will have vacuum hose from the Saucer to the "Y" and Vacuum hose to the Fuel pump.

If satisfied TURN the "Y" around like I said.

[bobf]

OK, I will give it a try. Just don't know what I might have done as it was all under covers when this all began. The only two points that I see that I messed with were the two at the carb and the one at the fuel pump. But now I have all covers off, including the floor boards.

OK, I will look at that little black thing by the tank. It was once tied to the framework but that strap has now broken. And what was that big canister for? It also has a big hose that goes up to the motor and then onward. I will have to look at that tomorrow as I am now done with the scoot for today.

I hope you are right as I am getting pretty tired of messing with this problem after several years of fixing and little riding.

[Alleyoop]

The big canister is a CHARCOAL canister to trap FUMES from the gas tank is all. Now you will find a hose from the canister going to the air box. So you can plug either take that hose off at the airbox and plug it up or take it off the canister and plug the hose there. BUt you want LESS HOSES around so I tell people to take it off at the air box and plug up the connector on the air box.

Usually what happens with that system is people OVERFILL the tank with gas or the scoot gets tipped over and now it is CURRENTS for that canister you just filled the vent hose with gas and it travled to the CHARCOAL canister and now the CANISTER is soaked and not doing it job. So I tell people to take that crap off less things that can cause problems and less hoses to crack and leak over time.
Alleyoop
Flipping the "Y like in this picture will create EVEN suction for the ACV and the Fuel Pump.

[Alleyoop]

If it ran good when you disconnected the hose at the SAUCER, I think you will be a happy camper and riding some

[bobf]

I will give it a try and if yours works, you will definitely get credit for that.

But for my curiosity I will then replace one part at a time till the problem comes back so I can tell others where to look. It sounds like you are convinced that the carbon thing is the problem. I will try to prove that myself.

When working I was a draftsman and then a designer and finally a product tester so my curiosity has been awakened. Failures need to be discovered for sure to help others keep from wasting so much time and money fixing.

We never did discover why we were having what I considered to be coolant being in those vacuum hoses. So I will keep on looking as I get the thing working. It was suggested that it was the carb so I bought another one. No solution. Now in the vac tubing it makes a bit more sense as they go running around and likely the problem or problem transmitters.

Have a few days rest as I will be hauling the wife again tomorrow morning. Then I will begin my modifications and looking for the cause at the same time, for who knows how soon the guilty steps up to be recognized. Will let you know as things develop.

Thanks a bunch for your efforts and support.

My first car was a Packard 4 dr sedan with a big straight 8. Now working on a small single cylinder engine. The big 8 was a lot simpler than this single engine.

[Alleyoop]

Very easy to verify: Maybe 5 minutes to switch a couple of hose around.

Take the Saucer Vacuum hose off the "T" and disconnect hose going to the "T" from the "Y" and connect the SAUCER hose onto the "Y". Now you will have vacuum hose from the Saucer to the "Y" and Vacuum hose to the Fuel pump.

If satisfied TURN the "Y" around like I said and you then can take the rest of the crap off and just have the vent hose from the tank above the tank done.

CLICK ON THE PICTUE TO EXPAND IT:
Here is all you have to do to verify
Take hose #1 and put on the other the "Y" and leave everything as is for now

[bobf]

Thanks Alleyoop. That is exactly one of the things I wish to do. But I am also looking for how the coolant yellow water also go into the system and appeared at the carb connection. For me, eliminating the general riding situation is but part of the problem. How and why are also in my curiosity. So that will require a bit of looking. Riding will happen real soon if I take a few days to satisfy my curiosity and look around a bit.

Your correction sounds to be OK so I have no fear right off of not riding soon. But for wasting near 6 months on this mess I have no concern about adding another week or two with looking around.

My concern now is trying to get back to riding soon as by June or July it gets way too hot for me to be riding around down here in Arizona's hot desert country. I really hate riding when it gets in the 100's and even up to as high as 115 and I believe one day it got to 117. Those numbers are really too hot for riding. If traveling, get going at first light and ride till noon. Then find a cool motel and get your sleep for next days run. Just my opinion.

[bobf]

Alleyoop, no good news yet. I have been busy a lot today and did not get much time on the scoot. I did remove the tubing and set it up like you suggested. But so far the engine has failed to start and it has really pulled the battery down each time I tried. So try to start then charge the battery again. Rather a bit boring. Battery is charging right now.

I have the tubing as you said and I agreed with.

I also took the tubing to the filter cartridge off and it was filled with a yellow fluid which I considered to be coolant. The tubing beyond the filter and to the gas tank top was not filled with any fluid at all, it was dry.

Maybe I should take off the other lengths of tubing and make sure they are dry too. I will do that later as it would only take a few minutes.

Now for Wednesday and Thursday I will have a doctor on Wed and the wife on Thur. Not sure how much time will get dedicated to the scoot those days.

Just felt you needed a status update so this is it.

[Alleyoop]

The only thing right now that would cause it not to run like it did when you took the hose off the saucer is the tank is NOT VENTING. So I would take the hose off at the little black box coming from the tank and try starting it again.

I would check your gas and see what color it is, I cannot think of anything that would send coolant into the vacuum hose.
Alleyoop

[bobf]

Thanks for responding. I was just out checking the vent line and found the one to the gas tank to also be filled with that yellow, no odor, type of fluid. It is all drained now from all three lines. When the battery is once again charged I will try to start. Doesn't matter if gas or coolant, just don't know how that stuff is getting in there.

I just have put some gas in the tank so it is now half full. I don't see how that could be the problem as for right now the hose is just hanging down and open.

[Alleyoop]

Like I said I would check the color of your gas don't forget that gas has been in there for months. Maybe a fresh gallon of gas would be in order. Also it was not hanging before according to your drawing. The vent hose was connected to the little black box then to the canister then to the SAUCER and intake manifold.

Disconnect it from the little black box and just leave it hanging there to vent.