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I replaced the carb, fuel lines, and bulb. Like a fool I do not remember nor did I write down how everything hooks back up. The carb has 1 nipple on the top and a straight and curved nipple on bottom. The bulb has three nipples with a shorter one and a longer one on the outer circumference and a longer one in the middle. PLEASE HELP!

Are you sure of that ?
never seen a prime bulb with 3 nipples.
They are all simple duck bills so should have an IN nipple & an OUT nipple.
Damp your finger, put it over the nipples then pump the bulb.

The OUT nipple goes to the return line
The IN nipple goes to the carb
The fuel supply line goes to the carb

If you want any more info you will need to post some photos.

Not tryin to take away from my good friend BERT.....

here is another item you can dwell upon ...
see these after clicking on this link ..

https://www.google.com/search?q=tro...&oe=utf-8#q=troy+bilt+tb635ec+repair+manual&*


another SIMPLE solution to MANY maintenance issues... use a digital camera , take many, many pics
during disassembly, repairs, reassembly or whatever... you can always delete them but I find mine
useful many times over , ..... better than a manual at times . ...:thumbsup: ...Boobala

Feazels said:

I replaced the carb, fuel lines, and bulb. Like a fool I do not remember nor did I write down how everything hooks back up. The carb has 1 nipple on the top and a straight and curved nipple on bottom. The bulb has three nipples with a shorter one and a longer one on the outer circumference and a longer one in the middle. PLEASE HELP!

Click to expand...

It would really help if you could post pictures. :smile:

I've never seen a carb or primer bulb with 3 nipples before. :confused2: But I would try them like this:

The three nipple primer came up in my last MTD update, but we didn't discuss the ins and outs of how it works. and I didn't find any reference to it in the AC8 manual.

Found this manual ...by zooming on the pics , you can see where the fuel tank lines go to the carb.. however it does NOT show the lines of the primer bulb ..what does the bulb attach to or with ... send pics if possible

http://service.mtdproducts.com/Training_Education/769_02614A_ac3.pdf

Not only does MTD not have a manual to explain the 3 nipple primer, they don't even give a part number for the primer itself. So I guess when the primer cracks you throw away the trimmer.

After some serious digging this is all I could find ... NO MENTION of a primer with 3 ports , no pictures of
a primer with 3 ports .... SORRY I'm done ... maybe you can figure this out by trial and error ... Boobala

http://support.mtdproducts.com/app/answers/detail/a_id/380

http://service.mtdproducts.com/Training_Education/769_02614A_ac3.pdf

https://www.youtube.com/watch?v=EL2lZpTfbMw

https://www.youtube.com/watch?v=H4jeU38txV0

https://www.youtube.com/watch?v=VGq1wuBNM00

Everything I've seen shows me that the primer IS a part of the carb itself ...it is NOT a "remote" primer...please send pics to verify if I am wrong !!

Boobala, The primer appears to connect to the top housing of the trimmer. And MTD shows the primer NA on the parts diagram. the TB635ec has a full model number of 41ADZ63T766. Be aware this is the AC8 engine not the AC3 that you keep referencing.

ILENGINE said:

Boobala, The primer appears to connect to the top housing of the trimmer. And MTD shows the primer NA on the parts diagram. the TB635ec has a full model number of 41ADZ63T766. Be aware this is the AC8 engine not the AC3 that you keep referencing.

Click to expand...

Hey there IL ...
I've been all over Hells Half ACRE researching this ...... troybilt, mtd, ereplacementparts, partstree, etc.etc.etc.
Ac1 AC3 AC10 ..,,http://support.mtdproducts.com/app/answers/detail/a_id/10584 (see bottom of page.. handhelds)
even if its remote, what the hell is a third port for ..??? I cant see where it would go after looking at all this stuff and the you-tubes ...this is 1 reason I ALWAYS stress to folks to take pics !!!

primer P/N= 731-08319
carb P/N = 753-08323
model # = 41ADZ63C766 ( what I found)

After some thought and research, I think I've figured out the 3 port setup.

This trimmer has no choke. Read the owner's manual, there is NO MENTION of a choke. Pictures in the owner's manual do not show a choke either. Because it has no choke, there has to be a way to richen the fuel-to-air ratio for a cold start. Enter the 3 port primer. In addition to purging air from the carb and fuel lines, it sends a small quantity of fuel into the carb throat via the 3rd port on the carb. (Or it may send air to the carb and actuate a diaphragm or pump that sends fuel to the carb throat.) Anyway, it somehow causes fuel to be put in the carb throat, regardless of how it does this. If you look at the position of the 3rd port on the carb, you will see that it is located up top near the carb throat, while the other two are nearer to the bottom of the carb.

Problem solved. :wink:

Feazels: Connect the fuel lines like I showed in my picture earlier. That should be the correct setup. :thumbsup:

ILENGINE said:

The three nipple primer came up in my last MTD update, but we didn't discuss the ins and outs of how it works. and I didn't find any reference to it in the AC8 manual.

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Gees , that was helpful, do those updates cost a lot ?

Bert it cost $60 and they provide lunch. Starts normally at 9 am and we are normally done sometime around 2 pm. I find most update schools to be a waste of time, but they make us go to maintain active status.

bertsmobile1 said:

Gees , that was helpful, do those updates cost a lot ?

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Knowing Bert , and only guessing ... I detect a very, very, slight bit of sarcasm...over that up-date class (LOL)
No offense Bert ...NO offense IL !!! ..:laughing:..:laughing:..:laughing: ...Boobala

Boobala said:

Knowing Bert , and only guessing ... I detect a very, very, slight bit of sarcasm...over that up-date class (LOL)
No offense Bert ...NO offense IL !!! ..:laughing:..:laughing:..:laughing: ...Boobala

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Well there was a bit of both.
I mean to tell you they have a new system then not tell you how it fix it or even how it works is a bit lame.
O did the Kohler certification thing, got a perfect score then attempeted to get a certficate & open an account.
Neither were available to me unless I have a shop front.
Briggs took a booking for their course thne told me I was not allowed to attend as I had to be already attached to an authorised B & S dealer. or was that BS dealer.

Feazels said:

I replaced the carb, fuel lines, and bulb. Like a fool I do not remember nor did I write down how everything hooks back up. The carb has 1 nipple on the top and a straight and curved nipple on bottom. The bulb has three nipples with a shorter one and a longer one on the outer circumference and a longer one in the middle. PLEASE HELP!

Click to expand...

hey can you please provide the Sizes of the diameter of the lines and how far in the tank should it enter? thanks

Watch this video

https://youtu.be/jT6acdJ6zsk