Is the primer bulb on the Ryobi 725r necessary? There was a time when we did not have these primer bulbs. Can i just plug the holes in the tank and bulb and crank as in the old days?
I dont think you should do that since the primer bulb is what gives gas to the carb, on most models.
Testimonial: "There should be a "Maybe" answer to the helpful question because I really don't know if this is helpful or not. There is an additional fuel line that runs from the tank to the carb. I should have asked if the other fuel line feeds the carb before I asked if the bulb is necessary. My thinking was that the priming bulb just primes and that the fuel line feeds the carb once it is cranked."
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.
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
SOURCE: Ryobi 725r 31cc
Ryobi is Japanese for "Piece of ****" My suggestion is to throw it out!
My 767r has had fuel line and carb trouble from day one. I'll never buy another Ryobi or Craftsman tool again.
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
SOURCE: Ryobi 725r Fuel Line replacement
form a gasket silicon gas resistent at any auto parts store about $6
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.
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.
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