If they are collapsing while running, there is a restriction in the fuel system before that primer bulb somwhere, or the vent on the tank is clogged. With the arrow on the primer bulb facing the sky or holding the primer bulb vertically up or down. Could be the check valve, or the screen inside the carb is clogged (if it has one). MarineEngine.com does not offer troubleshooting assistance or repair advice by email or by telephone. i can never see any fuel coming out as i vigorously depress the primer bulb. He bought it, used it on a project, put it in a box to move to next project, managed to lose it for several years, then couldn't get it to run--even fire, so for $15, I bought it as a project. 03 duramax primer bulb does not stay hard? The fuel simply passes through. Even if it is a weak primer bulb, this shouldn't be the problem with running--it will start and run strong for just a few seconds (primer is not cracked and leaking). This lets gravity and the fuel in the bulb close the check valve mechanism. It does this by pulling fuel through the fuel line. Join Date: Jun 2012; Posts: 645; Share Tweet #2. You may need to fix or … I took carb apart and ck for blockages and reinstalled. -Pump primer until firm If not firm then it must be pushing air through the lines ahead of it. 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. Tags: None. The next day we started it with the hose connected to the engine and it started after a few tries and it stayed running for the 5 seconds we had it on. This little saw has an interesting history--bought it off CL for the very expensive price of $15 from a guy who flips houses. The primer bulb fills and the trimmer starts up 2-3 pulls! I usually recommend the no-cost checks & tests first to rule them out. Air and fuel should leak out as you pump. Join Date: Jun 2012; Posts: 645; Share Tweet #2. I can pump it while at 2000 RPMs and the engine will catch up. Be sure that fuel lines and primer bulb are good. Not get hard. Does the bulb stay full and ... My thinking is if the fuel pump was not working it would not suck gas. Mine did the same thing. Comment . The Primer Bulb Is Stuck in My Craftsman 32cc Weedwacker. Is this a tale-tale the Low Pressure Fuel pump is bad? 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. 1. Thank you for your help. Is primer bulb necessary? Check valves are non-serviceable and replacement of the valve body is the only fix. Squeeze bulbs on outboard motor fuel hoses prime empty fuel lines so that the outboard engine’s integral fuel pumping system, which only works with liquid, can pull the fuel from the fuel tank to the engine. Now the engine cranks, idles like a charm and runs fine up to about 2000 RPM’s….. beyond that it simply is not getting the gas it needs. The bulb will not get firm and the filter doesn't completely fill. 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 should never need to use the primer bulb unless you run the fuel tank dry or let the boat sit up several months. 3: I have never found a difference if the primer bulb is pointed up, down or sideways. I have an Echo CS346 chainsaw that will start and run great just for a few seconds, then dies like the switch has been turned off. Hopefully today I can take a look at it--will remove filter 1st and try. One shows the primer bulb pushed and the red is … Your string trimmer (also known as a weed wacker or weed eater) draws fuel from the tank to the carburetor via the primer. Trying to fix a 2 cycle grass trimmer/edger. Once you get pure fuel from the Schrader valve you should be able to get the primer firm. Your order may be eligible for Ship to Home, and shipping is free on all online orders of $35.00+. Should primer bulb outboard stay hard? Popped a new pump in and it ran great. Check this web site and look at the illustrations. There is a new primer bulb coming in the kit I … ok i have a junky lowes special chainsaw with primer button. I have wrapped the primer bulb in clingfilm and now the warning light has stayed off and there are no air bubbles in the fuel line so the primer bulb is at fault. 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. (This is extremely important, DON’T hold the primer bulb horizontally.) - 2003 Chevrolet Silverado 2500HD. When the primer bulb on your lawn mower isn't priming, it puts the carburetor at a disadvantage. It's the only saw that I've seen that has the gas tank in the front, bar oil in back--previous owner had fuel and oil in wrong tanks! It does move the gas and once started the trimmer runs just fine. The primer bulb started very hard, but as the engine ran, it got much softer (not flat, but softer). Pump the bulb until it is firm to the touch. wasn’t hardto do. Still no go. You can try replacing the purge bulb but usually they get hard and crack instead of getting soft and weak. If not, the bulb may be damaged. Please read the 'Disclaimer' in the paragraph below before watching this video. Topic: Primer bulb won't stay hard (i.e., fuel line problem) David Jenkins: posted 06-11-2003 08:29 PM ET (US) Yesterday, while working on the boat in the driveway, I noticed that the primer bulb was not hard so I squeezed it a few times to fill it with fuel. I ca n't get the airlock out or what i should try will be.. 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