272xp won't restart after refueling

[Aaron B]

Hello, I'm hoping someone can help me with a problem that just started occurring yesterday. The saw is a 1997 272xp that I bought off a forum member 7 or 8 years ago and has run great. I re-ringed it two years ago.

When the saw runs out of gas, no matter the procedure, it won't restart. I pulled the plug and checked for spark, got it. The plug is dry. It doesn't matter how many times I pull, and different procedures - full throttle, no throttle, choke, or no choke, it just won't start. I have dripped fuel into the intake and the saw will start. It will stay running after doing this as long as I need it to and the saw runs great.

Is this vapor lock, or am I overlooking something? I will say that after the saw starts, it is running through the entire tank of fuel when it shuts off again (out of gas). I have a ton of oak logs I am bucking up and have only shut it off a couple times before it needed to be refueled, and in those instances, it starts right up. This is only occurring after it has been run to empty.

Thanks in advance to any help with this.

 

[cus_deluxe]

Sounds like weak crankcase pulse, or slightly stiff carb diaphrams. Any work done to carb in the time youve owned it?

 

[cus_deluxe]

Since this saw has a solid intake block, weak case pressure is unlikely to cause what u have goin on i think.

 

[Aaron B]

No, I haven't done anything with the carb. since I've had it.

 

[Aaron B]

I always run 93 octane fuel and the stihl oil mix in my saws. Do you think I need to put a rebuild kit in the carb?

 

[Ozhoo]

...Do you think I need to put a rebuild kit in the carb?

Yep, what you're seeing is classic symptoms of a hardened fuel pump diaphragm.

 

[Aaron B]

Yep, what you're seeing is classic symptoms of a hardened fuel pump diaphragm.

Ok, sounds good. I'll order a rebuild kit for it.