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What is the fuel line (primer lines included) arrangement on the Ryobi 790R ''ez'' sn: 706131855? I have the Manual for it, but it doesn't show the fuel lines and how they run. Replaced lines (removed all at once), now not sure how they belong.

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Posted on Jan 02, 2017

worldvet
  • 859 Answers

SOURCE: Ryobi Grass Scorpion Petrol lines from tank to primer to carby where to where

Thanks to doityourself.com.

The line off the top of the primer bulb goes to the top of the carburetor.
The line on the bottom of the primer bulb goes to the fitting on the center of the fuel tank and the line off the side of the fuel tank goes to the bottom of the carburetor.


Regards,
Worldvet

Posted on Oct 28, 2008

  • 8 Answers

SOURCE: ryobi 790r i have changed the gas line and the

You cannot flood the engine by pushing the primer bulb too much, unless the hoses are hooked up backwards. The primer does not push gas to the carb, it sucks gas through the carb and returns it to the tank. Top barb on primer is the hose coming from the return side of the carb and the bottom fitting is the hose going to the return fitting on the tank. Look inside tank, it is the one without the filter on it, just a flange with a hole in the center.

If you can see gas and air bubbles moving through the primer and into the tank the hoses are on correctly. If you see bubbles going in the correct direction and then reversing when you remove your finger from the bulb, then the check valves in the primer may be bad. Replace primer.

When you say the primer "gets hard to mash", do you mean it is hard to push in or is it very slow to refill and return to the home position? If it is hard to push in and the bulb is full of gas and the hoses are on correctly then there must be a plug in the line going to the tank or the vent in the gas cap is not working. If it does not return, then it is most likely a plugged filter, plugged line from the tank to the carb, plugged screen inside the carb or a stuck needle valve. The primer is creating a slight vacuum to pull the gas through the carb, which is what the carb does when the engine is running. If there is a full or partial restiction on the supply circuit neither the primer nor the carb can pull enough gas for the engine to run. May need to disassemble carb and clean out any varnish, gunk or plugged ports/jets. Use spray carb cleaner. May want to think about a diaphagm and gasket kit if you do it yourself. If you do not feel confident in taking apart the carb, then take to a repair shop.

Posted on May 23, 2009

#1 Taper
  • 1040 Answers

SOURCE: replacing fuel lines on ryobi 767r trimmer

The longest, and sometimes smaller in diameter of the two fuel lines, goes from the carburetor to the bottom of the tank. Leave enough slack in this line so that the filter that attaches to the end will rest comfortably at the bottom of the tank.

The other fuel line goes from the primer bulb to just inside the tank, (about an inch). make sure that you get the right size fuel lines. The plastic coupling goes on the end of this line, inside the tank. This keeps the line from pulling out of the tank.

(HINT): When feeding the lines through the tank holes, cut the lines at an angle. They will feed much easier into the holes. You can than cut them off square, once you know that you have enough to work with.

If you need further assistance, just let me know.

Jim

Posted on Jul 03, 2009

  • 1 Answer

SOURCE: RYOBI weed eater.hard to start. starts then stops

I have a ryobi doule line bought in 1997..Had same problem put new gas cap on and problem solved..could not get air in....

Posted on Aug 02, 2009

canbruce75
  • 1776 Answers

SOURCE: gas lines fell apart and I have new ones for a

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.

Posted on Sep 30, 2009

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I have a Ryobi 790R "E Z" and need to know how to


It is not too hard. Just make sure to cut the new fuel filter line long enough so that you can get ahold of it inside the fuel tank to install the filter. The fuel return line only has to go into the tank 1/2" or more to do it's job, so lenth is not a problem unless you wish to install one of the little nylon connectors on it's end so it doesn't pull OUT of the tank. That is optional.

The small diameter line out of fuel tank (has filter in-tank on end) connects directly to the side of the carburetor that has the fuel pump....that is the cover without the hole in it. Other larger diameter fuel line out of tank connects to the longer nipple on the external purge/primer bulb. The bulb "pulls" fresh fuel from the fuel tank to the carb and then out of the carb to itself, where it then "pushes" any air/old fuel back into the fuel tank. The remaining larger diameter fuel line in this setup goes from the metering chamber (has cover with writing on it and a vent-hole) side of the carburetor to the smaller nipple on the purge/primer bulb. Again, on the primer bulb, the longer nipple has a line going directly from it to the tank. This is the return line. The shorter nipple on the bub has a line from it going to the metering chamber side of the carb. If the purge/primer bulb is on top of the carb...small line from carb body to small hole in tank with filter. Larger diameter line goes from the bulb on the fuel pump side of the carb to the larger hole in the fuel tank where sometimes the line is held in place with a nylon nipple connector that keeps the line from pulling out of the tank. Otherwise, the line should enter the tank for about 1/2" or so

Jul 19, 2011 | Ryobi Garden

1 Answer

Ryobi cultivator #RY60511A : Need diagram or text to show the fuel lines from the tank to the primer and the carburetor.


here is a manual,Tim:

http://lawnandgarden.manualsonline.com/mdownloads/38dcb043-331f-461b-a08c-072d67fc76c0.pdf

here is a diagram:

http://photos.hobbytalk.com/showphoto.php/photo/34693

in a nutshell:
1 connect top carburetor line to short nipple on primer bulb.
2 bottom carburetor line to fuel line with filter (inside tank).
3 connect remaining fuel line that comes out of fuel tank to the large nipple on primer bulb.

Hopes this helped Tim

May 29, 2011 | Garden

1 Answer

I have a ryobi #790r the gas lines were bad , in replacing them I find an extra hole in the gas tank I can't figure out what came out of it, I found nothing that would indicate something was missing ...


The best way to state my solution is to give you the instructions I made for just replacing the bad fuel lines on a 2-stroke trimmer. Your Ryobi should fit this bill.
The small diameter line out of fuel tank (has filter in-tank on end) connects directly to the side of the carburetor that has the fuel pump....that is the cover without the hole in it. Other larger diameter fuel line out of tank connects to the longer nipple on the external purge/primer bulb. The bulb "pulls" fresh fuel from the fuel tank to the carb and then out of the carb to itself, where it then "pushes" any air/old fuel back into the fuel tank. The remaining larger diameter fuel line in this setup goes from the metering chamber (has cover with writing on it and a vent-hole) side of the carburetor to the smaller nipple on the purge/primer bulb. Again, on the primer bulb, the longer nipple has a line going directly from it to the tank. This is the return line. The shorter nipple on the bub has a line from it going to the metering chamber side of the carb. If the purge/primer bulb is on top of the carb...small line from carb body to small hole in tank with filter. Larger diameter line goes from the bulb on the fuel pump side of the carb to the larger hole in the fuel tank where sometimes the line is held in place with a nylon nipple connector that keeps the line from pulling out of the tank. Otherwise, the line should enter the tank for about 1/2" or so.

May 14, 2011 | Garden

2 Answers

Won't start , can not get primer to work even after replacing primer bulb.


If your fuel filter is clean, and none of the fuel lines are pinched, then you probably need to replace the diaphragms, gaskets, and screen in the carb. Some carbs with the primer bulbs mounted on the carb have a check valve in the primer system. This is the least likely problem, but it is possible that the check valve is defective.

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You have done just about all you can do with this machine give up and buy a new one

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Need a repair manual for a Ryobi 790r fuel line diagram


Here is a page that will take you to a download of the exploded view of the trimmer ..
http://safemanuals.com/user-guide-instructions-owner-manual/RYOBI/790R-SERIALS-810046371-THRU

on the right side there is a place to select the download .

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1 Answer

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:
  • The hose in the tank with the filter on the free end connects directly to the carburetor input connection.
  • If the saw is equipped with a primer bulb, an output line from the carburetor connects to the suction side of the primer (once the bulb is collapsed it draws fuel from the tank through the carburetor to refill as it inflates).
  • The pressure side of the primer returns displaced fuel to the tank as it is depressed.
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HTH
Lou

Nov 14, 2009 | Ryobi 18-inch Electric Chainsaw Chain Saws

1 Answer

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.

Sep 30, 2009 | Garden

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