Motor will not stay running unless I keep pressing the primer bulb. As soon as I stop pressing the bulb the engine dies. It seems to be getting enough gas as gas is dripping out around the carburator area.
Hey! had the same problem w/a trimmer not used for 2 yrs. Tried the bulb replacement since I cound see air in the fuel lines. Solved the problem! (Saved the hassle + $$$ of replacing the carb). Thanks a big bunch! Ryobi model 767r 16" 31cc This would probably work on other engines using bulb primer.
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This is a problem with most ryobi tools. From what i've read over time the gas lines shrink and need to be replaced. You'll need to replace both the lines coming from the carb to engine and the one connecting to your primer bulb. I hear there is a kit that contains both the primer bulb and fuel lines for this exact problem.
The line from the fuel tank that has the filter on it goes directly to the carburetor below the primer bulb. One line comes from the carburetor to the primer bulb. The other line goes from the primer bulb to the fuel tank. Primer bulb can be pressed to determine which side is pulling fuel (line from carb) and which is pushing (line to fuel tank).
You can order them directly through Ryobi and pay a small fortune or you can go to any small engine repair shop and purchase the fuel line by the foot. I believe your primer bulb can easily be replaced with what your local shop will have in stock. The parts from your local shop will probably out last the factory parts anyway.
As with all 2 strokes if you have compression and a reasonable spark, you only need fresh fuel with correct oil ratio) and they must go !(as long as you haven't fiddled first and all gaskets are sealing) I start mine by(1) pumping the primer till it is firm,(2) full choke,(3) pull till it kicks ONCE,(4) half choke, pull till it runs,allow to warm up and(5) switch to run (you may need to apply a bit of throttle while pulling as in (4)(or give it a few more pumps if it dies) If all is ok, check that when properly warmed up there is a smooth transition from idle to full revs, if it hesitates it may need the LOW SPEED mixture leaning (clockwise) SLIGHTLY.If it dies the LOW SPEED mixture may need richening(anti-clockwise)(adjust 1/8 turn at a time) Make sure that motor is just peaking at full revs and is on the RICH side of peaking (HIGH SPEED mixture)(this will avoid seizing it Adjust both till it revs cleanly and is JUST rich at full, and idleing nicely and it should start without too much trouble.(If you have fiddled and are lost,-about 2 1/2 turns out from closed on both needles should get you started)
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. also check the primer bulb for pin holes and proper seating/seal. i