Any of you boys ever work on a Stihl TS760 ?

[ZeroJunk]

I spent too much time on one this morning. Just would not take the fuel. Funny thing is you could see it coming in the main nozzle and then just stop.
It is basically an 076 conversion. I had worked on one before that came from cutting steel at the world trade center post 9-11 . That one just had a piece of channel attached.
This one is different. So, I rebuilt the carb, replaced the top fuel line, impulse line. Pressure tested the bottom in tank hose. Same thing.

Well, as a last resort I looked at the IPL. What they did on this creation is convert the front oil tank to a separate fuel tank with it's own line and filter.

I have decided that it is pulling air in that front fuel line.

Question is , how do you get in there. The front what would be oil cap appears to be a glued in plug.
The second fuel line going from the top of the rear tank has a sheath around it and then disappears above where the impulse nipple comes out and enters the repurposed front tank.

So, how do you get in there? Or, is there a tech bulletin on replacing that front oil fill hole plug ?

Beats me. I suppose I could just block that whole mess that goes to the front.

I don't even understand how the fuel gets up there.

Bare with me . I am not particularly Bright.

 

[ZeroJunk]

I have been on this forum for a while. You have to wonder what happened to it.

On the bright side, I will figure this all out some time tomorrow. And, it may be of some value to somebody down the road.

 

[Chevboy0167]

It should be like the TS510 I reworked last summer.... maybe???

That front CAP is removable and is just snapped on there. Then Stihl used a plastic female hex plug for the tank cap that can be removed using a bolt with the correct hex.

 

[Chevboy0167]

https://www.ebay.com/itm/2325240694...044&customid=4c60a737ba0a1f39d073c01c421ec1e8

 

[ZeroJunk]

Thanks, that is the part of the puzzle that I was struggling with.

 

[Chevboy0167]

Yeppers. Took me a bit struggling too!

 

[ZeroJunk]

I hate to say it, but this thing may beat me.

The machine will run for a few seconds and you can see a strong stream of fuel coming out of the main nozzle. Then it just dries up.

Withe the advice of Chevboy I have replaced every fuel and impulse line. Both filters. And ,rebuilt the carb.

Does the same.

Now, I tried to blow through the impulse line by mouth , and it seemed to be clogged. Squirted some carb cleaner through it and it cleared up. Ran for a few seconds and quit. Same. You could see the fuel decrease and stop from the main nozzle.

So, is there or can there be enough gunk in the crankcase to clog that impulse line back up ?
Could there be a crack in the nipple where the lines attach to the sump line in the tank ?
Something stopped up in the carb ?

This is the Tillotson that has three nipples. One for impulse, one for fuel, and another that vents off of the metering diaphragm back in to the intake.

Appears to be nothing like it still available.

It galls me to give up on anything. But, this thing might get me.

 

[pioneerguy600]

alexcagle is sort of an expert on the cutoff saws, lets see if he is around,@alexcagle

 

[Chevboy0167]

To me it sounds like the tank elbow fitting is venting air into the fuel supply side maybe??? Stihl calls it tank vent.

 

[cookies]

I hate to say it, but this thing may beat me.

The machine will run for a few seconds and you can see a strong stream of fuel coming out of the main nozzle. Then it just dries up.

Withe the advice of Chevboy I have replaced every fuel and impulse line. Both filters. And ,rebuilt the carb.

Does the same.

Now, I tried to blow through the impulse line by mouth , and it seemed to be clogged. Squirted some carb cleaner through it and it cleared up. Ran for a few seconds and quit. Same. You could see the fuel decrease and stop from the main nozzle.

So, is there or can there be enough gunk in the crankcase to clog that impulse line back up ?
Could there be a crack in the nipple where the lines attach to the sump line in the tank ?
Something stopped up in the carb ?

This is the Tillotson that has three nipples. One for impulse, one for fuel, and another that vents off of the metering diaphragm back in to the intake.

Appears to be nothing like it still available.

It galls me to give up on anything. But, this thing might get me.

sounds like you should pull the cylinder and rinse out the crank case to check for loose rubber bits, pebbles, gasket material etc