I have the same problem with my ut08580. When inspecting the carb, I noticed the diapham was torn. I cut a small amount off the corner of the diaphram and set it in the spot of the tear and put it back together. It worked for now, but I would like to order a new diaphram does anyone know how. I've been searching different parts sites for 3 hrs with no luck. I hope I don't have to buy a new carb.
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Re: new model ut08580 backpack will not start
Check the fuek lines for hole and leaks, check the fuel filter and clean if necessary. remove the carbuerator and inspect the gasket; it should be soft and flexible, if it seems hard or brittle replace it. clean the carb with carb cleaner sray (available at any local auto parts store) and compressed air. make sure you get inside the small fuel rail holes. check the primer bulb for pin holes and seating/sealed properly. if that doesn't work have the carb repaired at a service center or replaced.
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Sounds like it could be a number of faults. 1. Crack in the primer bubble its self, not allowing the creation of pressure or vaccum. 2. The plastic primer base has a valve in it. That could either be blocked or damaged. 3. Blocked up fuel line (not very likely) 4. Hole in the fuel line which is sllowing it to suck air up and not fuel. I\'d be putting my money on 1 or 2.
I assume the new tank came with new fuel lines and filter in it.
First be sure you have all the lines hooked up correctly. There should be a main line from the tank ( has the fuel line on the end of it in the tank) to the fuel pump side of the carb. Then there should be a line leaving the metering side of the carb to the primer bulb then from the primer bulb returning to the tank. When you press the primer bulb you should see it **** the fuel into the carb then from the carb into the primer bulb then back into the tank.
If the fuel lines are all hooked up correctly then you should rebuild the carb.
There is no such thing as a fuel overflow line.
If the unit has a primer bulb then there will be 2 lines in the tank ( 1 is a main fuel line distinguishable by the length of line that extends into the tank with a fuel filter on the end of it, the other is a return line from the primer bulb that terminates just inside the tank usually with a male to male conector.) The main fuel line will go to the carb and another line from the carb will go to the primer bulb. If any of these lines are discolered, fragile or broken then they should be replaced. Generally the smaller diameter line is the main fuel delivery line and the larger diameter line is the primer system.
The order of fuel travel should be:
Fuel filter to fuel hose to Carb's Fuel Supply nipple. (On the main body of the carb)
Primer Plate Nipple on carb to fuel hose to Suction Nipple on Primer Bulb. (It must pull fuel thru the carb, not push)
Pressure Nipple on Primer Bulb to fuel hose to Fuel Tank Return hose.
When correctly installed, the fuel will be PRESSED into the fuel tank via the return hose when primer is pressed in . . . and SUCTIONED out of the tank and into the Carburetor when primer in released.
What does your carburetor look like? Does it have a primer bulb? If so, look in the fuel tank and find the uptake filter, it's a cylindrical looking object connected to a fuel line inside the tank. Trace that line (an easy way I did this was to blow into the fuel lines myself and watch the cylinder, the line that makes it bubble out gas when blowing is the supply line) BE CAREFUL if you do this, you do not want to inadvertantly swallow gas!
Anyways, the line connected to the cylinder is the intake, the other is a return line and needs to be connected to the primer bulb port...from there it's gravy! Hope that helps you!
Hello . After you replace the primer bulb , the left tube on the primer bulb goes to the fuel filter inside the tank and the one on the right is just a fuel return that goes inside the tank . Hope this help