Question about Ryobi 15" Electric Factory Reconditioned Trimmer (ZRRY41002) - Factory Reconditioned

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Ryobi 790r how do i replace the gas line

I have replaced the filter gas line and i am having a hard time replacing the return gas line. What can i do? I currently have stuck the gas line back through the line and the gas is leaking from the line that needs to be replaced.

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2 Suggested Answers

jakeslimco
  • 56 Answers

SOURCE: Gas leaks

figure out where it's leaking from.. and fix it :/ or provide a little more detail on the issue

Posted on Aug 26, 2009

Testimonial: "You were right, remove cover-more rotted fuel lines, plus finger pump."

rycgl
  • 1545 Answers

SOURCE: 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

Posted on Jul 20, 2011

Testimonial: "The information given was very helpful."

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1 Answer

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

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.

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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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The fuel fillter line goes directly to the carb.inlet first
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1 Answer

Gas line cracked and nipple fell back into tank ..how do I remove gas tank to replace gas line and nipple????..ryobi 725r trimmer


Empty the tank by dumping into a can or something. Shake the trimmer around until the "nipple" falls out. Get a replacement fuel line and follow their instructions. When yoou put the tube back into the tank, have something that you can guide the line through the hole with. I used a small hex wrench. If you cut the tip of the tube at a sharp taper, it will be much easier to start through the hole. You might think of replacing the return line as well. You should not have to remove the tank if you expose the carb and remove the air filter...Good luck...Lee

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1 Answer

I have a 790r. I have worked on small engines a long time. I took the carb apart and cleaned it-it set for 2 years. I reassembled it and now it starts but when I pull the throtle it dies, or won't rev up....


It may not be your carb at all. I had a Stihl that was doing the same thing. I ended up replacing the fuel lines and the filter (in the tank). It ran great after that. Hope it helps!

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I have a ryobi 790r weedeater and i need the gas tank off . How do I do this?


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