Join Date: Feb 2011. marbobj. Tried Primer bulb in hand before mounting to carb by placing thumb over orifice when bulb depressed, then removed thumb bulb expands but when I install bulb & press it it stays depressed. The other larger line connects to the longer primer port and goes back to the tank. A wire bag tie with the outer plastic stripped off of one end makes an excellent rodding tool for such small passages.I'm presuming that you replaced that primer bulb when you worked on the carb, but if you didn't and the bulb is a brownish color and kind of stiff when you pump it, it needs replacing also. primer bulb won't fill with gas when pressed. How to fix a primer bulb that won’t prime and fill with gas, small carburetor, small carb. All failing, put it on Ebay. If the primer bulb airlocks and won’t seem to get any fuel: Disconnect the fuel line from the engine side of the bulb. Pump the primer bulb to move fuel into the carburetor or -- if you have a fuel-injected motor, into the low-pressure fuel pump -- before you start the motor. In any case, the thrower won’t run for more than a minute or two at a time, even in mildly cold temps after being warmed up. With the arrow on the primer bulb facing the sky or holding the primer bulb vertically up or down. Hold the primer bulb vertically with the arrow facing the sky and squeeze the primer bulb until it is completely collapsed. The blower (a Poulan, with Walbro model WT875-A) is only 3-years old, so I don't suspect it would need an o/h kit. It pushes air out of the fuel lines and sucks gas into the carburetor. Leave most major carburetor repairs to a professional. Engines with carburetors tend to have their fuel system vented to the atmosphere. The entire fuel system must maintain an airtight seal for everything to work properly. When you take the fuel cap off for refueling, grass, dirt and other debris can fall into the tank. Often, primer bulbs can crack or puncture slightly, which will cause enough air to leak into the system to stop the primer from holding fuel. Mike. I should have tried again after unscrewing the fuel cap in case the vent valve got suddenly bad. Then from the carburetor to the primer and back to the tank. It may not display this or other websites correctly. I hear a little squeak. Craftsman weed eater 358.791010 primer bulb won't pull gas. Inspect the fuel lines for cracks or loose connections. faulty, fuel lines not hooked up properly/pinched. Blame it on the heat! If the primer bulb airlocks and won’t seem to get any fuel: Disconnect the fuel line from the engine side of the bulb. Report This by Manage My ... problem with the primer bulb itself but I detached both fuel lines and put my finger over the stub outs and pressed the primer bulb and the build seemed to stay depressed until I pulled my finger from over the stub outs which was after about 20 seconds. Gas flows through the lines. https://www.hunker.com/12401384/how-to-troubleshoot-a-primer-bulb Any Hints are gratefully appreciated. I have a 2000 20' cobia CC with a 150hp Yamaha. I checked the bulb and it looks ok. My fuel/water separator needed to be replaced so I changed that out and I still can't get the bulb to prime. Gas Snowblower: Won't stay running. The engine probably starts because gas enters the cylinder when you press the primer bulb. Most likely, the gas is getting blocked at the source. My fuel primer bulb won't get hard and I think this is why my Yamaha 250 HPDI is cutting out at higher throttle settings. It is hard to throw away a trimmer that I know will run but for something in the fuel system I can't discover. B. BassHunter0123 Seaman. PROBABLE CAUSE: Faulty fuel filter, faulty carburetor check-valve. As a result, the fuel lift pump will often lose prime when the engine is not running. I replaced the bulb and it will not get hard. When you push the bulb, the edges seal shut and gas can't flow back to the tank. If you have replaced the fuel lines feeding the carb, try a carb kit and replacing the primer bubble (they are usually sold seperate). JavaScript is disabled. Inspect the carburetor mounting gasket seal for tears or improper fit. ... Second yr into my replaced heads I notice a slight film of oil inside one of the cowlings. Bulb is not cracked or broken. Most likely, the gas is getting blocked at the source. Everything looks good and clean and it is only two years old. The primer bulb is attached to the second or purge hose. 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