Question about Ryobi 30 Cubic Centimeter Curved Shaft Gas Trimmer

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Hard to start and when it does it quits presumably after the primer fuel is expended.

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Will most likley need to clean carbarator

Posted on Sep 18, 2009

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My prime bulb looses pressure and first start is hard. I have to remove fuel line from filter and cover with thumb prime re install then first start takes time.


Does the engine run fine after it starts? Most common problem with primer bulb losing prime is an air leak in the fuel line or primer bulb. Air leaks don't always leak fuel. If there is an air leak between the primer bulb and gas tank there is no pressure, only vacuum. If it is not a major leak it might not leak without pressure but it will allow air to enter the fuel line. If it is a very minor air leak it could allow air to replace the liquid in the fuel line over time, but so little air once it is primer again that the fuel pump can over come it with volume of fuel.

Primer bulbs do not stay firm, as they are when initially pumped up, after the engine is running. There are check valves in the primer bulb that hold pressure in the primer bulb and throughout the fuel line to the engine. Once the engine starts the fuel pump creates vacuum drawing fuel into the engine diminishing this pressure and releasing the check valves. At this point the primer bulb is just another segment of fuel hose allowing fuel to pass through it as the fuel pump demands. The primer bulb functions much better when the outlet side is higher than the inlet side. This position makes it easier for the check valves in the primer bulb to seat and release as needed. If the primer bulb is functioning properly and is positioned with the outlet side higher than the inlet it should not be necessary to cover the end of the fuel hose with your thumb to get it to prime.

If the engine is hard to start after being fully primed there could be a problem with the fuel system on the engine. Some engines are hard to prime once air has entered the system, especially fuel injected models.

Dec 19, 2014 | Boating

3 Answers

Craftsman 550


Priming may not be the problem. First try putting some duct tape over the hole in the primer button. then try priming and subsequently starting it. This could indicate a need for a new air filter...I know it doesn't make sense, but it will probably be the answer to your problem. It was with mine although a different type of mower.

Jul 21, 2014 | Mtd 22" Yard Machine Push Mower

1 Answer

My Ryobi 4 cyl 30cc leaf blower just quit starting. Has always started perfectly, but now it just wont start.


replace spark plug.if spark plug okay problem could be carburetor or air leak at fuel lines or check primer bulb for crack which cause air leak.any breaks in fuel line or primer bulb cause air leaks fuel system cause carb not get fuel run engine.

Sep 20, 2013 | Ryobi 30 Cubic Centimeter Curved Shaft Gas...

1 Answer

I have a poulanpro 260 chainsaw when i went to use it ofter 6 months,it would not start.had old stail gas. i change the gas,cleaned the air filter,check and cleaned the spark plug,still not starting. one...


Check the fuel filter, and muffler for plugging. Check the condition of all of the fuel lines. Fix or replace the primer pump. When you get it working right, push the primer quite a number of times to flush all of the old fuel out of the carburetor. Unless the carburetor is in trouble, you should be able to start the engine again. Hope this helps!

Oct 23, 2010 | Poulan Pro 42CC 2 Cycle Chainsaw, 18"

1 Answer

I need a fuel line schematic for a WeedEater brand Featherlite Plus weedeater


Presuming the primer bulb is on top of the carb....Fuel filter line out of gas tank goes to the lower part if carburetor body. The other line (normally larger in size) coming out of the fuel tank goes to the primer bulb outlet on the top of carb.
If the primer/purge bulb is not on the carb, things are a little different. The fuel filter line out of the tank still goes directly to the carb, as the bulb will pull old fuel/air out of the carb allowing fresh fuel to flow in and pushes old fuel/air back to the fuel tank.
Fresh fuel in, old fuel out of the carb...you can hook up a piece of fuel line to the bulb and tell which one is pulling and which one is pushing..or depress it with your fingers on it...either way you can tell.

Jul 04, 2010 | Garden

1 Answer

Both lines came off of the posts on a te 450 trimmer. which line goes where?


I presume you mean fuel lines. The return (without fiilter) line goes nearest the primer bulb. The supply (which has the filter attached inside the tank) goes on the further nozzle from the primer bulb.

Nov 28, 2009 | Poulan/Weed Eater #Wt200 711724 24cc Gas...

1 Answer

I am replacing the fuel tank assy and purge bulb (i.e. primer) on my Sears Craftsman model 358.798940. The original plastic tubing was old and brittle and broke apart while disassembling, so I could not...


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.

Hope this helps,
Dolf-

Oct 16, 2009 | Garden

1 Answer

I had to replace the primer bulb and fuel tubing. The primer bulb just disappeared, presumably blew off. I have installed the new bulb and replaced the fuel tubing, but I need to know where the tubes...


The line with the fuel filter in the end comes out of the tank and it goes to the bottom fitting on the carburator. The other line comes out of the tank and goes to the bottom fitting on the primer bulb, and the third section goes from the top fitting on primer bulb to top fitting on carburator. Got it? lol Hope this helped and best wishes.

Aug 25, 2009 | Garden

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