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Need gas line schematic for ryobi 990r. routing to and from carbuertor, priming bulb and gas tank.

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Posted on Sep 19, 2011

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mitchjl_1692
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SOURCE: Need routing of fuel lines on Ryobi string trimmer Model 725R.

The larger fuel line goes from fuel filter to carbuerator.The smaller line is the return line from the purge bulb tofuel tank. mitchjl_1692

Posted on May 27, 2009

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SOURCE: where do I connect the fuel lines on my ryobi weedeater?

I have Ryobi775r string trimmer with walbro WT526 carb. The fuel lines connect 3 parts eg. gas tank, bulb (mine is a separate bulb not part of carb.) and the carb. The bulb has 2 fittings- a short and a long one. The carb also has 2 fittings- one on top (vertcle) and one on the bottom (L shape). The gas tank has two holes in the bottom one for over flow line and the other for fuel inlet to the carb. This has a filter in the gas tank. Now the connections- connect the long fitting on bulb to the tank. this is the overflow. Connect the short fittin on bulb to the carb top (verticle) fitting. Connect the fuel line (with filter - it is in the tank) streight to the L fitting on the bottom of the carb. Make sure the fuel lines are of right diameter. Too big-and you will have leaks. You are done connecting the fuel lines. just for info. the bulb is there just to pull a vavcume in carb so that the fuel is sucked into the carb and is present there when you start the engine. Hope it helps. Good luck.

Posted on May 10, 2010

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SOURCE: how to route the gas lines on 775r ryobi weed

Ryobi 775r Fuel Line Diagram..

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Posted on Apr 27, 2012

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Priming echo BP251 liaf blower


Hi Norman:
I'd check the routing of the fuel lines.
Tank to carb (this is the line with the filter on it)
carb to bulb (suction side)
bulb to tank (return line)
If the connections appear correct but it does not pull gas, check the filter to make sure it is clean, and you can try reversing the connections on the bulb.
Hope this helps.

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Why won't my chainsaw prime?


if no gas will enter priming bulb at all I see only a few possible things for this
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1 Answer

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The fuel fillter line goes directly to the carb.inlet first
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Has Ryobi RCS 3535A chainsaw a fuel bulb priming


The numbers you supply don't cross to an operators manual but that is typical of Homelite/Ryobi. I'm going to make an educated guess that it does not have a primer system. Other Ryobi saws with primer systems include it in the specification. The 3535A does not. Close scrutiny reveals no primer.
IMO fuel primers on chainsaws are one more source of problems. In the USA ethanol additives attack fuel hoses. Without a primer routing is from the fuel tank directly to the carburetor and much simpler to replace. Primers on chainsaws operate differently than 4 cycle engines too. No fuel is injected into the carburetor or engine, its only purpose is to ensure the carburetor is full of fuel,
Typical Fuel hose routing:
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HTH
Lou

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3 Answers

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The primer bulb sucks fuel from the tank to the carb. When the carb has enough fuel the remainder is sent back to the tank. When you replaced the fuel line did you use the exact length of line and did you re-install the filter. On some of the trimmers the filter is weighted and holds the line in the fuel. Good luck...Lee

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Bottom of the tank one is an overflow, 2 in the top are connected to the bulb
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The fuel line leaks coming out of the plastic fuel tank on my Ryobi Brush Trimmer (990R I think). I am replacing the old plastic fuel lines into the tank but noticed that they are a little loose too. Any...


There is a little white ring that goes over the line and into the opening on the tank. This is what seals the line so the gas won't leak out. They are about $1.00 at any small engine service shop.

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