Check the fuel 'pick-up' filter in the tank to be sure it's not clogged or stuck inside where it's not in the fuel mix. check the fuel lines for clogs, debris, or fuel 'shellac-ing'.
if the filter and lines are clear and secure, then check the seating of the fuel bulb. you may have a leak allowing air to be pumped rather than fuel.
The one way or "check valve" in the primer bulb may be gummed up and stuck to the body of the bulb, preventing fuel from entering it. Alternatively the bulb might be cracked preventing it from sucking properly. See my comprehensive troubleshooting guide which covers many issues related to 2 stroke engines
String Trimmer Won Work 2 Stroke Engine and Carburetor Troubleshooting
SOURCE: runs only via primer bulb
You definitely have a fuel problem. But you will have to take the carburetor off and disassemble it. As far as other carburetor parts failing; yes , but it's probably do to old age or much use. You should first take the carb. apart and clean the all ports with a Den Tek Brush, (used for cleaning teeth), they work great for this job. The smallest particle's can keep the carb. from operating properly. Also, check for a small screen that filters the fuel. It sets down in a larger port. It can get clogged as well, or even blocked completely. If after you have done all of this and it still doesn't work, you will need to purchase a carburetor kit for unit. It will come with various gaskets, a screen, and a needle valve. this should definitely solve your problem. You will also want to change your air filter, (if you haven't already), because if it is old and dry rotted, pieces of the filter can get sucked into the carb. that you just spent an hour or so cleaning. You will then have to disassemble carb. and clean again, NOW THAT WOULD STINK!!
Good luck.
SOURCE: primer bulb won't prime
it sounds like the filter on the fule line is cloged try to remove the filter and then try to prime the trimmer. it it does you need to replace the filter. just about any filter that will fit will do.
SOURCE: primer bulb doesn't pump gas
Does the primer bulb pop back out or does it come out slowly? Is the inline hose in good shape or has a crack where it can **** air in? Did you check to see if the diaphgram in the carb is pliable or is it paper-like and needs replaced. Or your carb could be stopped up.
Only one problem..I can't think of any weedtrimmer that has an inline fuel filter. They are usually located in the gas tank.
SOURCE: primer bulb only holds suction, wont move fuel thru line
By "holds suction" this means that you can depress the primer bulb and it remains in the "pressed" position and/or does not reinflate (for lack of a better term)?
You need to determine if a blockage exists in either one of the fuel lines, or with the primer bulb itself.
First, drain your fuel tank. Do this into a clear mason jar or equivalent and inspect your fuel to see if it is full of debris since even very small pieces of grass, dust, dirt, etc... can cause problems. If so, then you need to flush your fuel tank and or lines.
Viewing the backside of the primer bulb, you can see several clear fuel tubing lines that lead from the primer to the carbureator and fuel tank..
Next, carefully remove these using a pair of needle nosed pliers (or by hand is at all possible) being very careful not to crush or tear the tubing.
With the clear tubing removed, if the primer bulb will press in and immediately reinflates back to it's relaxed position, then one or more of your lines are clogged by a small piece of debris. If the primer still does not relax, then it is blocked by a small piece of debris or needs to be replaced (pick one up at Lowes, etc...).
If you determine that your lines may be clogged, then I have had success clearing them with a can of WD-40 by sticking the red nozzle into the clear tubing (attempt to make a seal) and by pressing for a half-second or so. If you get flow, then let it rip for a second, then proceed to rinse your fuel tank again just for good measure (basically until you get nothing but clean gas...no debris).
Put it all back together and let it rip!
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