Question about Ryobi Snap In Primer Bulb Pump 683974 Blower Trimmer

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After about third pump bulb stays in it's my neighbors line trimer i replaced the gas line. it was not there. i think i ran the line right.

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Check out this sketch. after about third pump bulb stays in it's my - 33ec956.jpg

Posted on May 02, 2010

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Sounds like air in the system, take spark plug out, pump bulb 3 or 4 times, replace spark plug and try to start. Repeat.

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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, @@

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Poulan/Weedeater 1500(150mph)blower. Always cranks easy,ran great for years! I Found "split open" gas line;the larger line , return I think(sucking air). I Replaced both lines. Now "WILL NOT...


If the primer bulb is sticking down then, first try taking the gas cap off and pumping the primer. If this solved your problem, the duckbill valve built into the gas cap needs to be replaced, or you can replace the whole gas cap. If this didn't solve your problem, you have a clog somewhere else in the system or an internal problem with the carb. Try taking a pair of needle nose pliers and pulling both fuel lines out of the tank. Take the fuel "filter" off of the line and try pumping the primer. If it sticks down still, your problem is inside the carb. A rebuild kit would probably fix it if you are confident in tearing down and reassembling the carb, otherwise you can just replace it for about 30 dollars.

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I have a handheld blower/vac: The primer bulb is new and will not pump fuel,not even fill the bulb. I checked the fuel lines to make sure they were correct.(homelite)


I was working on a neighbor's homelite chainsaw and I replaced the primer bulb, it was not intuitive, and I hooked up the lines backwards. Also if you are replacing the primer bulb, maybe you have old fuel lines that are deteriorating and need replaced. Did you check the in tank fuel filter? If it looks dark, it may be time to change it.

I hope this helps get you going again.

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Gas lines fell apart and I have new ones for a ryobi 790r trimer but do not know what line goes where there are 3 hoses could some one show me or tell how to fix this trimmer??? warren9@hotmail.com


Typical fuel line routing is:

One line (the one with the fuel filter in the end of it) comes out of the fuel tank and goes to the bottom fitting on the carburator. The second line comes out of the tank and goes to the bottom fitting on the primer bulb. The third section of line goes from the top fitting on primer bulb to top fitting on the carburator. Hope this helped and best wishes.

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