I have a ryobi 750r trimmer. the fuel lines were broken off when i got it. i have the new fuel lines and primer bulb, but do not know where yhe lines terminate. wheather the the return line goes to the top or bottom connection on the carb. and where the lines on the primmer bulb connect.
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Re: location of fuel lines, where they terminate.
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.
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.
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not difficult at all to do , first obtain Ryobi primer /fuel line kit from your local distributor , then remove air cleaner cover (pops off with fingers) then drain all gas from fuel tank back into storage tank , locate the two Phillips head screws next to primer bulb and remove them , careful not to drop them !! remove old bulb from ring and replace with new bulb from pkg. then using a clean cloth , carefully wipe out sealing grove where bulb seats down (I guarantee its dirty) when all clean , place bulb down in grove and make sure it seats well then secure with ring and replace screws (don't over tighten) you might as well replace the fuel lines as they come in kit , instructions are on pkg , I do suggest doing one at a time to not forget how they go , and do use the new fuel filter that's inside pkg too
Ryobi makes a neet little fuel line kit for these , and its inexpensive too , it contains a new fuel filter (and tool for installing it) a new primer bulb (change it anyway) and enough of two different fuel line to reach your trimmer's carb , I stock a few of these here and you can buy ne from any roybi dealer , the only tool you need besides your fingers are a pair of scissors and a Phillips screwdriver for taking off the air cleaner to gain access to lines
directions are included on back of package
Petrol lines disintegrate when fuel is stored in the trimmer for long periods of time. These can be obtained from any small tool repair store. Just remove them and install new ones. They just slip through the holes in the tank, re-attach the fuel filter on the supply line. Make sure that the line is long enough so that the filter rests on the back/bottom corner of the tank. Be sure that the lines are attached to the proper ports on the carb>
I don't mean to over simplify this, but are you using fresh gas? Gas string trimmers are extremely ticky when it comes to gas. They like it SUPER fresh. And while the gas and oil mixture should be right, it can be off a little bit and still run. Try draining all of the gas out, and then filling up with fresh mix. This is ALWAYS my first step with string trimmers, and it fixes the problem 75% of the time.
Hope this helps!!