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). 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. Buy Adefol 20 x Carburetor Primer Bulb with Check Valve for Walbro 188-16 Carb Poulan Craftman 530-035497 Echo STIHL String Trimmer Brush Cutter online at. 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.). 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. 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. If it leaks, note where the leak is: F Step 2-With pressure present from step 1, pump the primer bulb, the pressure should drop. If it holds, the fuel pump components and inlet needle are sealing, go to step 2. 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. Purge Primer Carburetor: F Step 1-Pressure test carb inlet no higher than 10 PSI. If so, then you need to flush your fuel tank and or lines.

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. You need to determine if a blockage exists in either one of the fuel lines, or with the primer bulb itself.įirst, drain your fuel tank. SOURCE: primer bulb only holds suction, wont move fuel thru lineīy '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)?

Prmer bulb stihl check