How JustAnswer Works:

  • Ask an Expert
    Experts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional Answer
    Via email, text message, or notification as you wait on our site.
    Ask follow up questions if you need to.
  • 100% Satisfaction Guarantee
    Rate the answer you receive.

Ask Rick Your Own Question

Rick
Rick, Factory Authorized Trainer
Category: Small Engine
Satisfied Customers: 8055
Experience:  Outdoor Power Equipment technical trainer since 1990, covering eight states.
20444326
Type Your Small Engine Question Here...
Rick is online now
A new question is answered every 9 seconds

I have an Old Poulan Super 250A chain saw with a Tillotson

Resolved Question:

I have an Old Poulan Super 250A chain saw with a Tillotson carburetor.
I've clean the carburator thorughly and installed a rebuild kit in the carburetor. The carburetor will not pump fuel into engine. You can prime it with fuel or starting fuel and it will run for a few seconds and die. I've used air pressure on the fuel tank to force fuel to the carburetor and started engine that way, but will not continue to run.
Any suggestions.

Thanks,
George Barnett
Submitted: 3 years ago.
Category: Small Engine
Expert:  Rick replied 3 years ago.
Is the in-tank fuel filter in good shape?
Customer: replied 3 years ago.
I replaced it with one from a working tool. Blow breath back through the fuel line indicates it is open.
Expert:  Rick replied 3 years ago.
Did you do a complete cleaning on the carburetor, all the small passages, when you put in the kit? What is the compression reading on the cylinder?
Customer: replied 3 years ago.

I cleaned all the passages with WD 40 and blew out with compressed air. Detected air flow through passages. I have not checked cylinder compression.

 

I engine sounds good when it running.

Expert:  Rick replied 3 years ago.
Does this saw have a pulse passage in the block that may be plugged?
Customer: replied 3 years ago.

No, there is a single fuel line to the carburetor only.

 

What should the cylinder compression be if I can get my a gauge into the plug hole?

Expert:  Rick replied 3 years ago.

Then it has a pulse passage that may be blocked. Be sure and check. Look for a small hole underneath the carburetor that supplies a pulse to operate the fuel pump.

 

A two-cycle should have at least 120 psi.

Customer: replied 3 years ago.
Yes, I've checked to be sure the gasket was not blocking the passage, what additional test can I do to assure it's open to the cylinder?
Expert:  Rick replied 3 years ago.
Can you blow air through it?
Customer: replied 3 years ago.
Yes, it's open.
Expert:  Rick replied 3 years ago.
If you are sure of the lines, the filter, the carburetor rebuild, and the pulse passage, then the compression would be a key thing to check.
Customer: replied 3 years ago.
I couldn't get a real good test, but what I did, indicates very low compression.
Expert:  Rick replied 3 years ago.
That would prevent the fuel pump from operating and make the engine very hard to start. I'd try to get as accurate a reading as possible, but if it's low, you're looking at a piston and rings, plus possibly a cylinder, unfortunately.
Rick, Factory Authorized Trainer
Category: Small Engine
Satisfied Customers: 8055
Experience: Outdoor Power Equipment technical trainer since 1990, covering eight states.
Rick and 3 other Small Engine Specialists are ready to help you

JustAnswer in the News:

 
 
 
Ask-a-doc Web sites: If you've got a quick question, you can try to get an answer from sites that say they have various specialists on hand to give quick answers... Justanswer.com.
JustAnswer.com...has seen a spike since October in legal questions from readers about layoffs, unemployment and severance.
Web sites like justanswer.com/legal
...leave nothing to chance.
Traffic on JustAnswer rose 14 percent...and had nearly 400,000 page views in 30 days...inquiries related to stress, high blood pressure, drinking and heart pain jumped 33 percent.
Tory Johnson, GMA Workplace Contributor, discusses work-from-home jobs, such as JustAnswer in which verified Experts answer people’s questions.
I will tell you that...the things you have to go through to be an Expert are quite rigorous.
 
 
 

What Customers are Saying:

 
 
 
  • You did one super job of explaining to me everything there is to know about this fridge. I'm looking forward to asking you questions in the future. Jimmy Bagley, IA
< Last | Next >
  • You did one super job of explaining to me everything there is to know about this fridge. I'm looking forward to asking you questions in the future. Jimmy Bagley, IA
  • Wonderful service, prompt, efficient, and accurate. Couldn't have asked for more. I cannot thank you enough for your help. Mary C. Freshfield, Liverpool, UK
  • This expert is wonderful. They truly know what they are talking about, and they actually care about you. They really helped put my nerves at ease. Thank you so much!!!! Alex Los Angeles, CA
  • Thank you for all your help. It is nice to know that this service is here for people like myself, who need answers fast and are not sure who to consult. GP Hesperia, CA
  • I couldn't be more satisfied! This is the site I will always come to when I need a second opinion. Justin Kernersville, NC
  • Just let me say that this encounter has been entirely professional and most helpful. I liked that I could ask additional questions and get answered in a very short turn around. Esther Woodstock, NY
  • Thank you so much for taking your time and knowledge to support my concerns. Not only did you answer my questions, you even took it a step further with replying with more pertinent information I needed to know. Robin Elkton, Maryland
 
 
 

Meet The Experts:

 
 
 
  • Curtis B.

    Technician

    Satisfied Customers:

    6989
    have worked on and around most engine models for 35 yrs./Polaris ATV expert
< Last | Next >
  • http://ww2.justanswer.com/uploads/KO/koboma/2012-6-6_20917_DSCF1022.64x64.JPG Curtis B.'s Avatar

    Curtis B.

    Technician

    Satisfied Customers:

    6989
    have worked on and around most engine models for 35 yrs./Polaris ATV expert
  • http://ww2.justanswer.com/uploads/SM/SmEngPro/2012-8-5_3564_Rick1206290005Edit.fullres.logo.scrn.64x64.jpg Rick's Avatar

    Rick

    Factory Authorized Trainer

    Satisfied Customers:

    4126
    Outdoor Power Equipment technical trainer since 1990, covering eight states.
  • http://ww2.justanswer.com/uploads/GI/giftindex/2011-11-19_2715_JamesLWells500.64x64.jpg James W's Avatar

    James W

    Small Engine Troubleshooting Expert

    Satisfied Customers:

    2978
    7 years as Mechanic & Parts Manager for Brother who has Owned Lawn & Garden Repair shop for 35 years
  • http://ww2.justanswer.com/uploads/jonrk/2010-1-5_22551_jon.jpg Jon K.'s Avatar

    Jon K.

    Small Engine Diagnostic Expert

    Satisfied Customers:

    2950
    Gold certified Stihl tech, Service Manager for a rental/repair shop.Certified in most small engines
  • http://ww2.justanswer.com/uploads/MR/mr2cycle/2011-3-12_03458_sears.64x64.jpg Vince O.'s Avatar

    Vince O.

    Small Engine Technician

    Satisfied Customers:

    2374
    Over 30 years experience repairing lawn and garden equipment. Chainsaws, mowers,blowers and trimmers
  • http://ww2.justanswer.com/uploads/rheisnger/2010-12-31_010856_41385_100001225699183_7012_q.jpg RUSS's Avatar

    RUSS

    SERVICE TECHNICIAN

    Satisfied Customers:

    1723
    28 YEAR SERVICE TECHNICIAN
  • http://ww2.justanswer.com/uploads/BriggsEngines/2010-02-26_230200_n1834842973_4823.jpg CJBennett's Avatar

    CJBennett

    Small Engine Technician

    Satisfied Customers:

    623
    Briggs and Stratton Master Service Tech, Kohler, Tecumseh, Kawasaki certified. 18 years exp.
 
 
 
Chat Now With A Technician
Rick
Rick
Technician
8055 Satisfied Customers
Outdoor Power Equipment technical trainer since 1990, covering eight states.