Question about Craftsman 25cc Gas Line Trimmer

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The carb has two barbs, top/bottom: what line connects to which?

Which barb does the primer bulb connect to: the top or bottom barb on the carb? Thanx.

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Just put the lines on the barbs and if the bulb does not fill up change it to the other barb

Posted on Jun 23, 2009

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My echo 210 primer bulb does not fill only pressurizes the tank


The fuel line hook up is wrong. Ok, so look at the two nappies on back of the bulb assy. The long nipple is for the fuel return line, (the line without the fuel filter that returns to the tank) the short nipple , that line goes to the fuel barb on the carburetor, on the same side as the bulb assy.. then on the opposite side of the carburetor find the fuel barb, connect the fuel line to that barb and into the tank where the fuel filter is on the end of that,... If you have trouble understanding what I mean, hmu.

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Gas lines on Husqvarna grass trimmer


Sorry do not think you will find a schematic, however this is how it should be, the Mondo has a remote primer, so there are three pipes, a thin pipe with the fuel filter on the end in the tank goes to the carb connection closest to the alluminium pump cover held with a single screw, the other connection on the carb goes to the back of the primer on the shorter of the two conections ( suction side ) the longer connection on the primer ( pressure side ) goes back to the tank, this is the return pipe, so remember the primer pulls fuel from the barb, into the bulb and dumps it back to the tank, it does not push fuel into the carb

Jun 17, 2012 | Garden

1 Answer

I changed the all the fuel lines on the trimmer but now when I go t start it up it will not start. it will crake up like to cycles then shut off.


If this machine has a primer bulb, make sure you have connected the hoses up correctly, the primer pulls fuel from the barb and pushes it back to the tank, it does not push fuel into the carb.

Sep 19, 2011 | Garden

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I need the fuel line routing or diagram for a Poulan Predator 2150 LE. I have parts list but it does not depict the fuel detail I need.


Jimmy there are no Poulan drawings with fuel system detail worth the ink it takes to print them, but that is all there is.
Fuel Line Replacement by SmallEng.com
http://www.youtube.com/watch?v=JrXpU70Hmi0
Routing runs from fuel tank to carburetor, (if equipped) through carburetor to primer bulb (once compressed bulb draws fuel as it returns to normal) , bulb (as it is compressed) returns displaced to fuel tank. HTH
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How far does the return gas line on a ryobi string trimmer extend


There is supposed to be a barb fitting with a flange on top of it that is on the end of the hose, inside the tank. If you do not have that barb in place the gas will start to leak out of the tank in a short time. Barb fitting is designed to have hose stick up about 3/16" into the tank when the hose is properly installed. You put the new hose on the fitting, thread the other end of the hose through the fill opening of the tank and out the hole in the bottom. Pull hose through until barb comes through the hole in the tank and the flange is flush with the inside bottom of the tank. There is supposed to be a plastic ring that fits over the bulge in the hose/barb at the bottom of the tank on the outside. Serves as a retainer for the fitting.

May 19, 2009 | Ryobi Garden

1 Answer

Need to know how fuel system and fuel lines are installed fuel lines dryrotted cant determine where to hook each line can i see a diagram


Line from tank with the filter on it is the supply line and goes to the carb inlet fitting. This is typically on the "bottom" of the carb (with the tank being up) and will usually have a fitting with barbs or a bulge on it to ensure a tight fit. The other fitting on the carb is the return line and is usually a straight tube fitting with no barbs. That line goes the suction side of the primer bulb. The third line goes from the outlet of the primer bulb to the return barb fitting in the bottom of the tank. Fittings have to be removed from tank to properly install the new hoses on them. Remove retainer ring on outside of tank and push fittings into tank, then shake out of the fill opening. More details on proper installation follows.

If yours is like all the Ryobi units that I have seen you just need a piece about 12" long of 1/8 ID fuel line. You can usually order that from parts suppliers or get it at some lawn and garden repairs shops. Hardware stores will not likely have it. There is a fitting with a hose barb on it that fits through the tank. On the outside of the tank on the bottom there will be a round plastic ring, assuming the fitting is still in place and just the hose split at the fitting. Use a knife or thin blade of some type to pry off ring. It is actually around the hose that is over the barb. Keep ring, you will need again. Now push fitting up into the tank. You may have to trim off the hose that is outside the tank on the barb to get it to go into the tank. Shake tank around and get fitting out of tank. You will see there is a piece of hose on it yet. Remove that piece of hose. Now take the new hose and slide it onto the barb. It must go all the way to the top of the barb fitting so that the hose actually goes into the tank through the hole drilled in the tank. The OD of the hose acts as the seal to keep gas from leaking out of the tank. You may need to put some oil of some type (vegetable oil works well) on the barb and inside of hose to help slip it on and use some pliers with smooth or rounded jaws ( no serrations, will damage hose) to get hose on. Thread other end of hose into the fill hole of the tank and out the hole in the bottom of the tank. Hint: Straighten out paper clip or use small wire inserted into the hole from the bottom of the tank up towards the fill opening. Slip tube over that and use the wire to guid the tube directly to the opening. Pull hose through the tank. When fitting with barb and hose over it reached the hole in the tank it will resist being pulled through. Carefully pull firmly on hose to stretch it so the hose/fitting "bulge" pulls into the hole in the tank. Look into tank and see when top flange of fitting is tight against the bottom inside of tank. You should see bottom of barb outside of the tank with the hose on it. Once in place put the plastic retainer ring back over hose and push up to bottom of tank. It should fit snuggly when you get to the "bulge" area. Cut hose length as needed to fit onto straight tube fitting on primer bulb. Should be good to go. You may find that the other hoses are getting bad also and may want to change them at the same time, as they will probably be ready to crack also. You can reuse filter from tank if it is not plugged, just add a new hose as described previously. Otherwise you can order a new filter with the line already on it. That line goes directly to the carb inlet barb. That barb is also hard to push hose on. Third line is from the return side of the carb to the suction side of the primer bulb. That is just a straight piece of 1/8" ID hose and pushes onto straight tube fittings, very easy to get hose on compared to barb fittings.

May 18, 2009 | Ryobi Garden

1 Answer

Replaced new gas line, new primer bulb, new gasoline. need to find out if gas line routing is correct / trimmer will start, but very hard to start, clean air filter. carb never been adjusted since new.


Line from tank with the filter on it is the supply line and goes to the carb inlet fitting. This is typically on the "bottom" of the carb (with the tank being up) and will usually have a fitting with barbs or a bulge on it to ensure a tight fit. The other fitting on the carb is the return line and is usually a straight tube fitting with no barbs. That line goes the suction side of the primer bulb. The third line goes from the outlet of the primer bulb to the return barb fitting in the bottom of the tank. Fittings have to be removed from tank to properly install the new hoses on them. Remove retainer ring on outide of tank and push fittings into tank, then shake out of the fill opening. More details on replacing hoses are listed in another post about Repairing Ryobi trimmer.

Have you checked the spark plug?

May 12, 2009 | Garden

3 Answers

Ryobi 700r 31cc 15" Trimmer


Just break off plastic caps to access the low and high speed jets. They are there because of government regulations to prevent users from adjusting carb in the field. They serve no other purpose.

Supply line with filter is suppose to be one piece from the tank to the carb. If it has a barb coupling in the middle then someone must have tried to patch the line at some point. You can get a replacement line and filter as part #682039 by searching online or ebay. Or you can just order line and reuse filter if it is not plugged. Required line is 3/32 ID x 3/16" OD. Both dimensions are critical. To replace line you have to take retaining ring off the bottom of the fitting on the tank (use a knife or scraper to pry it off the bulge in the hose) and push the filter fitting into the tank. Remove from tank through the fill opening. Remove piece of hose that is still on the barb. Push on new section of hose all the way to the top of the barb and right up to the filter. Put other end of hose through tank fill opening and through hole in bottom of tank. Use a piece of wire or a straightened paper clip to guide it to the hole. Pull hose through until the bulge gets to the opening. Pull hose firmly, but carefully so the hose stretches enough to allow the bulge to go into the hole in the bottom of the tank. Stop when the bottom edge of the filter is about 1/8" from the inside bottom of the tank. You should see enough of the barb end sticking through the tank for the retaining ring to be replaced on the outside bottom of the tank. If not enough exposed, pull hose through a little more. Thread line to carb input and insert. Inlet fitting will have barbs or a bulge on it. The return fitting on the carb is a straight tube with no barbs. The line from that fitting (3/32 x 3/16 also, as all lines are) goes to the top (suction side) of the primer. The other side of the primer has a line that returns to the other opening in the tank.

The return to the tank must have a fitting similar to the filter fitting, but without the filter. It is a barbed fitting with a flange ring on the end that is inside the tank and it has the retaining ring on the outside just line the supply side line. It sounds like you are missing that fitting, because you are describing the hose just being pushed up into the tank. Without that barbed fitting in place the tank will leak gas. The bulge in the line caused by the line fitting over the barbs is what seals the opening. You can order a return line kit 147290 from MTD parts that will have the line, the barb fitting and the retainer ring. In a pinch you could get use an 1/8" hose barb from a hardware store and just arefully pull it through the opening so that the bulge in the barb/hose combination is sealing the tank both inside and out. You can get by without the retaining ring. Otherwise look for a junk IDC/Ryan/Ryobi trimmer to scavange parts off of.

Sounds like you may still have a carb problem to deal with. Did you remove the needle valve to make sure it is not stuck or inlet plugged or restricted? Fuel screen clean? May need a diaphragm and gasket set. Good luck.

Apr 23, 2009 | Ryobi 30 Cubic Centimeter Curved Shaft Gas...

1 Answer

Ryobi 768r fuel line


Line from tank with the filter on it is the supply line and goes to the carb inlet fitting. This is typically on the "bottom" of the carb (with the tank being up) and will usually have a fitting with barbs or a bulge on it to ensure a tight fit. The other fitting on the carb is the return line and is usually a straight tube fitting with no barbs. That line goes the suction side of the primer bulb. The third line goes from the outlet of the primer bulb to the return barb fitting in the bottom of the tank. Fittings have to be removed from tank to properly install the new hoses on them. Remove retainer ring on outide of tank and push fittings into tank, then shake out of the fill opening. More details on replacing hoses are listed in another post about Repairing Ryobi trimmer.

Mar 22, 2009 | Ryobi 30 Cubic Centimeter Curved Shaft Gas...

2 Answers

Ryobi 700r gas trimmer, replace old fuel lines


Line from tank with the filter on it is the supply line and goes to the carb inlet fitting. This is typically on the "bottom" of the carb (with the tank being up) and will usually have a fitting with barbs or a bulge on it to ensure a tight fit. The other fitting on the carb is the return line and is usually a straight tube fitting with no barbs. That line goes the suction side of the primer bulb. The third line goes from the outlet of the primer bulb to the return barb fitting in the bottom of the tank. Fittings have to be removed from tank to properly install the new hoses on them. Remove retainer ring on outide of tank and push fittings into tank, then shake out of the fill opening. More details on replacing hoses are listed in another post about Repairing Ryobi trimmer.

To leemineres, if hoses are on right and unit still stalls after starting initially you probably need to disassemble carb and clean out using spray carb cleaner. May be sticky needle valve, or partially plugged port or jet.Could also be hole in diaphragm. Gasket and diaphragm kit would be good to add when you take apart, even if diaphragm does not have a hole.

Jan 21, 2009 | Ryobi 30 Cubic Centimeter Curved Shaft Gas...

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