Ms260 fuel starving

[Rich2484]

Ok so I got my 260 running problem, got a new carb and still same problem I have tried everything, compression good, vacuum good, seals good, carb is brand new, but it is not drawing the fuel up, if I put fuel straight to carb it runs fine until that runs out then it dies and that's it, if I put pressure into the tank to push fuel up to carb It will run but then run out when the pressure drops.

 

The tank vent is also good as it is from a working saw. Am I missing something, the problem before is the same as it is now, hence why I changed th carb for a new one as I'm fed up with carbs always being a problem and trying to fix them with new seals etc.

[spudulike]

Ok so I got my 260 running problem, got a new carb and still same problem I have tried everything, compression good, vacuum good, seals good, carb is brand new, but it is not drawing the fuel up, if I put fuel straight to carb it runs fine until that runs out then it dies and that's it, if I put pressure into the tank to push fuel up to carb It will run but then run out when the pressure drops.

 

The tank vent is also good as it is from a working saw. Am I missing something, the problem before is the same as it is now, hence why I changed th carb for a new one as I'm fed up with carbs always being a problem and trying to fix them with new seals etc.

 

Have you checked the fuel filter, has the fuel line got a hole in it and finally, is the impulse line blocked or leaking?

Sometimes the airfilter choke mechanism can play up on the 026 range - make sure your choke lever is actually closing the choke properly.

 

Personally I always try to avoid thowing new parts at saws and try to get to teh route cause - saves wasting my hard earnt or more importantly. others hard earnt:thumbup:

[Rich2484]

Tried and tested, replaced line from another 260 That was spares, The filter is clean as it always is.

 

Were is the impulse Line? Is it the part under the carb that goes down to the case? Didn't even think about that part?

[pleasant]

That's the one- they can perish or tear due to flexing

[Rich2484]

Ok I will get on that tomoz, having a lazy day today, it's the last thing I can do to test this saw before it gets stripped into parts and boxed.

[spudulike]

One point, you said you have good vacuum, that would imply a vac test has been done and that would show up an impulse line problem hence me always banging on about vac and pressure testing.

My money will be on the impulse line being split and that would stop fuel being pumped in to the carb - sound familier!

 

A £3.75 part and relatively easy fix!

[Rich2484]

Will have a look tomoz, sitting down waiting for my tea now

[Rich2484]

Ok, so the impulse line was blocked and was not connected to the crank case. Don't know how it passed a test. New carb is on and the saw is running perfectly. The old carb won't hold on Rickover tho, new seals fitted, bit not worried as I have the new one.

Thanks for the help.

[spudulike]

Ok, so the impulse line was blocked and was not connected to the crank case. Don't know how it passed a test. New carb is on and the saw is running perfectly. The old carb won't hold on Rickover tho, new seals fitted, bit not worried as I have the new one.

Thanks for the help.

 

No worries, glad it worked out - possible that someone plugged the impulse to do a vac test then forgot to unplug it and connect it. Anyway, it runs but who is "Rickover", is he a mate:001_rolleyes:

[Rich2484]

Hahaha didn't see that. Using an iPad and it has autocorrect or as I call it I'm going to write what the hell I like and not what your typing correct. Lol