I have replaced the fuel filter,& gas lines. It will run but unless I keep pumping the triger it will stop. Than after lot of adjustments it will run W/O the air filter ,but whenI I put the air cover on it stops .
I, assume it must NOT be getting air . I don't see any place to check it out.
What can I do??
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Re: MY HOMELITE ST 275
First, check the fuel lines for cracks/breaks. Replace if bad.
If they are
o.k.,then you will need to disassemble the carburetor and spray
with carb.cleaner. Make sure the small screen in the carb. is free of
debris. Use a Den Tek Brush, (http://www.drugstore.com/products/prod.asp?pid=165357&catid=1152), to clean the small portals in carb. These portals can become blocked. Reassemble and start.
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hello sir, my machine will only start when pumping primmer bulb or squirting fluid in the carburetor than stops. the fuel line has broken off, in most small carburetors this is a ongoing problem.old fuel will crystallize when left in tank for a long time.plugging up ports, fuel lines, small screen in carburetor.fuel lines will dissolve clogging carb.this is why it will run when the choke is on creating a vacuum to where there is fuel forced in the carb to rum,also the gas will evaporate leaving the oil behind clogging up carb.the thing to do is remove carb. and clean out,replacing gaskets or fuel line if necessary.use carb cleaner to clean out carb.make sure to make note where fuel line go.the fuel filter broke off of fuel line letting debris get in carb plugging it up.the muffler is known to clog up a lot on these machines where they want run. the compression should be 60 to 120 lbs any thing below 60 is junk. when adjusting the carb screws turn in all the way than turnout 1 1/4 turns turn in slow until machine runs also you need to check for spark by removing plug and grounding against engine to check spark, ok.a new spark plug would be a good ideal too , if you are going to make these repairs use new fuel line and filter,hope this helps,any comments welcome,thank you, 22
You can go to a small engine repair shop, parts shop or look on eBay and they should have the fuel lines you need. Not very expensive, about $1.00/foot for new Tygon lines. You are way overdue for replacing yours. The ethanol in the gas does a job on them.
If you look closely there should be 2 holes in the fuel tank, also if you look inside the fuel tank there should be some remaining pieces of the fuel line and a fuel filter. If this has been sitting for any length of time you will also want to replace the fuel filter.
Now comes the fun... or a challenge
To start with you will need 2 sizes of fuel line ( go to a small engine repair shop) while you are replacing things you may want to buy a new primer bulb also.
to insert the fuel lines into the tank you will have to cut a tapered tail about 2 " long so that you can grab the fuel line with a needle nose and pull them through and out of the tank so that you can trim off the tapered tails. On one install the fuel filter and stick back into the tank, on the other trim the tapered tail off and pull the line back into the tank but leave about 1" sticking through the tank.
Now hook up you fuel lines to the carb and/ or primer bulb
Fill tank half full with fuel ... now test the installation if it doesn't pump fuel but instead you can hear it blow bubbles in the tank it is simple just reverse your lines on the carb / primer bulb
Retest if it works like it should you are ready to attempt to start it... good luck
Take the old piece of fuel line and have the vendor match the size. Buy 1 ft. so that you have a little extra to work with. Cut fuel line at an angle. This will allow for easier insertion into the hole in the gas tank. Feed the line through until you can pull it out of the opening where the gas cap is. Cut the line off square. Attach the fuel filter. Pull the line back through until it rests comfortably on the bottom of the tank. Assemble the trimmer. You will then get a more accurate measurement to the carburetor.
Fuel restriction could be dirty in tank filter, or high idle screw needs to be adjusted. Do this by turning it counter clock wise 1/8 turn at a time start and check for improvement after each adjustment.