The Primer Bulb Is Stuck in My Craftsman 32cc Weedwacker. Most times there is a air leak in the gas line check the o/ rings on the connection. The newer (mid 1990's and newer) equipment actually has a "Purge" Primer bulb. Incorrect use of the priming pump may also cause a boat motor to flood. Uncle Knuckle LawnSite Senior Member. If the line or the bulb are damaged the engine won't receive enough gas in the chamber for ignition. The priming bulb is a small rubber button that pumps fuel into the motor when pressed. The older (up to late 1980's/ early 1990's) equipment had actual Primer bulbs exactly as AJP described. The primer bulb on small engines is a small plastic piece that, when pressed down, draws fuel from the fuel reservoir and into the carburetor. You push the bulb and fuel squirts into the venturi. great ⦠Took the old fuel line and bulb off, measured the ends on both sides of the primer bulb, cut it to length. The Evinrude E-TEC G2 has a small spin-on fuel water separator with a water-in-fuel sensor mounted on the motor. will_beames. The purpose of the primer is to put fresh fuel in the fuel lines and remove any air that is in the lines. I just replaced the fuel line on a Johnson outboard motor. Most small engines will not start if the carburetor is dry. A primer bulb that's lost its suppleness doesn't respond as a new one does. I can't get the primer bulb to pick gasoline up from the fuel tank. ... the carbs fill with a water/gas /oil mix. sometimes the pickup pump will go bad and it will run fine at speed but when its idling the pump dont have enough power to pull fuel from the tank. 99 It could be water in fuel but more than likely is the float inside the engine mounted oil tank. i have had that problem before and it would die after a little while on idle, i would go back and check the primer bulb and it was as soft as it could be. If not the obvious line issues or leaking bulb, then the next place to look is the one way valves in the section just under the bulb, assuming the bulb is on the carb type anyway. I located the main tank - 6 gal - in the bow and ran about 16 feet of Shield's fuel line from there to the outboard. Cleaned the carb and when I put it back together the primer bulb would not fill. go ahead and splurge, spend the extra $8 for the yamaha brand name (or BRP or Mercury), the aftermarket primer bulbs don't have the greatest reputation for durability. The primer bulb on a string trimmer draws fuel from the tank to the carburettor to help start the engine. Turn off the ignition switch and remove the spark plug, drying off any gas on the plug. Any leak from the tank to the bulb will not allow it to prime. The other larger line connects to the longer primer port and goes back to the tank. Use primer bulb to fill filter with fuel. If the primer bulb squeezes easily and doesn't feel like it's pumping fuel, it's time to determine what is preventing fuel from getting to the motor. Use a primer bulb whose connections are sized to match your fuel lines. Worked great. 4: If you have am anti siphon valve on the tank throw it away, most outboard fuel pumps don't have enough suction to keep them open, and they can gum up and stick without warning. It generally starts with a partial blockage, where playing around with the fuel hose and pumping the primer bulb will get the motor to start or keep it running. But won't pull it all the way into the fuel line. leave the gas cap lose the vent may be plugged.Does the primer bulb going soft or flat.Next the fuel pump.If older Mercury might have a crank case leak. Pressing the bulb only sends more gas to the carburettor. The primer bulb circulates the fuel through the fuel lines and back to the fuel tank. The fuel should flow from the tank to the carburetor. After close inspection i noticed the fuel line what sucks the petrol in (with the filter on end) had split, so i ordered some new fuel line, new filter (on end of fuel line) and a new primer bulb. When the primer bulb is squeezed, the pressure created closes the inlet valve and opens the outlet valve, allowing fuel in the bulb ⦠If gas is present in the tube, the system may be flooded with gas already. Perfect fit. Like other tools with small gasoline motors, your Craftsman Weedwacker needs help starting -- help ⦠I only use fresh, non-ethanol fuel mix. This will help in ⦠It took about 50 squeezes on the bulb to ⦠Re: Gas primer bulb going flat! pumped it up and it was good the rest of the day. Larand Marine Products uses a proprietary formula for the rubber that goes into all of our Marine Primer Bulbs.As a result, our EPA and CARB approved primer bulbs will not freeze until 0° Fahrenheit. Make sure the outboard is fully primed with fuel. « Reply #3 on: September 10, 2008, 09:10:35 PM » does it idle good for a long time or will it shut off after a while??? Disassembled carb again. Step 2. Then from the carburetor to the primer and back to the tank. 2: the only aftermarket primer bulb I would use is a Sierra (Shields Hose). so, get yourself a new fuel line with a primer bulb. It is easy to flood the units. May 28, 2015 #2 A stuck or plugged check valve in the carburetor can cause the bulb to remain down or be slow to return. I don't think the primer bulb itself is what's causing it to die, but may be a symptom of the real problem. I am using this primer bulb on my 14 foot aluminum fishing boat. Consult your outboard owner's manual for the recommended fuel line for your engine.) This helpful YouTube video by Succstrat explains what might be affecting your ability to get going. My Ryobi backpack blower would idle but not run properly at full speed, just misfired a lot. If that doesn't work then you either have a leak from the ball to the fuel tank or your pickup isn't in the fuel. Between the primer bulb and the carb there is a plastic part that has the tubing sticking out ⦠This small plastic bulb and attached line can get clogged or kinked. Squeeze the primer bulb a couple of times to prime the fuel pump. How to Replace the Primer Bulb on an Outboard Motor With an ... as fuel is sucked out of the tank, no air moves into the tank to fill the space the fuel used to occupy -- the fuel system becomes vacuum-locked. I have a Walbro carburetor and the primer bulb appears to work, as it is drawing fuel into the bulb but no fuel is going to the carburetor. I wonât be discussing that here so if your here for diesel oil filters, this wonât help you. I just put a new carburetor on it but it won't prime & start. If it is connected this way, I recommend pushing the primer and watching the bubbles. thing is, a faulty bulb looks *exactly* the same as a working bulb. 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. 4 years ago. I located the bulb at the outboard engine. Engine rough then primer bulb won't fill. Blower, lawn mower, weed eater, trimmer Very simple process. 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. If the fuel pump isn't primed, the motor may turn over without starting. How to fix a primer bulb that wonât prime and fill with gas, small carburetor, small carb. 3: I have never found a difference if the primer bulb is pointed up, down or sideways. (unless, obviously, it's been cut). Outdoor Gasoline and Electric Powered Equipment and Small Engines - primer bulb doesn't fill - The primer bulb on my Stihl power head (for edger/string trimmer attachments) won't fill⦠Any help on how to get the airlock out or what I should try will be appreciated. The carburetor is a part of the engine that mixes fuel and air together to make a combustion. If this bulb is pressed too many times, it will flood the cylinders to the point where the spark plugs can longer ignite; thus, rendering your engine dead in ⦠it could be a slight crack or weathering in the bulb or the hose. The same goes for fuel lines. I checked the fuel primer bulb and it was fairly hard. This is about: ... Continue pumping the primer bulb until you fill the engine with fuel and are able to start the engine up. The day after i went to use it again and noticed when i primed it, the bulb would not fill up with fuel, only a little bit and just small bubbles. 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