I need to know where the gas lines from the connection on the tank go to the connection on the motor and where the line goes from the bulb.
SOURCE: 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.
SOURCE: 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.
SOURCE: after about third pump bulb stays in it's my
Check out this sketch.
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SOURCE: fuel line from inside of tank from primer button
The one line coming from the tank will be the one with the filter in the tank... that goes to the primer bulb and then to the carb. There should be a return line to the tank and that provides the pressure for the system.
Be sure to get proper diameter replacement tubing. You want the fit into the tank to be snug so it doesn't leak.
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