chainmaster
ArboristSite Operative
It also be your gas cap not letting any air in the vent hole could be plug
Pioneer chainsaws
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I have played with the cap. The vent is gone out of it I think. Just a hole in the cap. I’ve tried with the cap off, still same results tho
chainmaster
ArboristSite Operative
You said you clean the carburetor new everything I had a same problem one time did the same thing that you are saying my problem was the fuel screen on the carburetor it was dirty replace the screen all good
What’s the chances this isn’t a carb issue ? Could an air leak cause this ? I’ve yet to vacuum test anything or throw a compression tester on it. I’ll tear the carb down again next, new screens were installed first time around aswell. Thx for the ideas tho.
Walter Glover
ArboristSite Guru
Will it run at half throttle and above? If you can keep it running above an idle the problem is the low speed circuit. If it runs out of fuel no matter how you play it then fuel supply needs fixing.
It’ll fire and I’ll lay into it, 3/4 throttle, Run strong, then eventually die after 4-5 seconds. Like it gets a fuel line worth of fuel and that’s it.
Walter Glover
ArboristSite Guru
Fuel screen in carb on my CP70L was plugging off with rust flakes from the weighting washer in the pickup. Did that a couple times until I cleaned everything.
Keep us posted eh
Keep us posted eh
10-4! Needed a couple nights away from the thing. I Was getting angry with it.
Have you tried removing your fuel filter and pump pressure into fuel line to check to see if your fuel hose is not leaking and make sure your fuel filter is not partially plugged. Have you changed your spark plug?
Thanks for the help, new fuel line and filter had no change. New plug aswell. Pulled filter right off to see if that helped, didn’t. It’s a neat old saw, would like to put it back to work.
Anyone have a source for a p28 af cover? I know they’re hard to come by, but a guys gotta ask. How about robbing one from a 1073 and painting it green? Same cover?
Thx
Thx
One thing I have encountered on the 3071 saws over the years is the impulse holes get blocked coming up from the crankcase to the carb and the carb then gets no signal pulse to the pump diaphragms causing a no fuel flow to the carb..Best to remove the elbow and reed assembly and clean everything up from the cylinder base to the carb, make sure the impulse ports are clear and reseal everything back up. If using sealers,take caution not to block off the ports, also make sure the carb to elbow gasket has the correct corresponding holes for the impulse, have seen gaskets with improper hole locations before.
Great advise. I too thought it was an impulse hole blockage. I’ve made sure it was clean and clear. I made a reed block to carb gasket but I will check again the impulse hole isnt blocked. My eBay carby kit had a gasket that looked like it would work, installed it and finally realized it wasn’t tall enough to covey the impulse hole channel that goes threw the block. It wasn’t pulling fuel to start it at all. I figured that out and made a gasket and thought life would be good after that.
Ok, just my experiences and two cents worth on carbs not pulling fuel, not that its worth two cents....LOL
I checked Bruce`s site and he does not have them listed now but try pulling up his eBay store, "cheapchainsaw",and take a look, often times he has stuff he does not have listed in eBay. I bought a dozen a few years back but they sold out in a month or less, could sell dozens more if I had them.
All great ideas. Think I’ll try to seal the reed block to the case better. And pull the carb and clean it again. Maybe play with the metering valve? Open it up?
Stupid things are worth more then the saws at this point I bet. Lol. This one has sedimentary value tho, so it’s gotta get done.
Everything needs to be airtight on the intake side and the carb built and set right in the carb, I have seen a few China carb kits recently that had either holes in the wrong places or no holes for ports at all.
Walter Glover
ArboristSite Guru
When it dies can you choke it and start it easily?
I got a deal on them for $12. @ at that time, they were black in color but they can be painted easily. I did a few in green by first priming them light grey and then overcoating them forest green, they looked real close to originals.
I sold my last NOS,. OEM cover for $50. not even I would pay that much for one but ya know how collectors are.
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