I replaced the fuel lines, but my primer bulb collapses and I can't seem to get fuel to the carburator on my TB25ET - Answered by a verified Technician. one primer bulb has a hole in the middle, the other does not. Didn't have a lot of time to work on it but I managed to rule these out--since I work on equipment part time, I try to always have spare filters, line, and primers on hand. Any suggestions? Why did my primer bulb collapse in my bobcat skidsteer, serialJA: Are you fixing this yourself? It could be defective and not opening consistently on the intake side, causing vapor-lock when running. With the arrow pointing to the side where you pulled the hose off. I just finished podding my malibu and i put on a new 150 yamaha. So my questions are, is there really supposed to be a hole in the bulb for this engine, and if the hole is supposed to be there, why does gas leak out of it? Purchased new primer bulb, does the same thing stays pushed in. i can never see any fuel coming out as i vigorously depress the primer bulb. Is there a bad seal somewhere else that is providing a vent to allow it to leak from the primer bulb hole? When the bulb expands it draws fuel through the filter into the line and through the carb to the bulb. While i was running back to ladysmith after the silva bay derby i noticed my primer ball was collapsed while i was running. The fuel line and primer ball is new from yamaha. It would randomly collapse and had to be replaced. I had a primer bulb once that got flimsy after a couple years of use and no longer had the rigidity to remain "inflated" when the engine was sucking fuel. When the bulb is pressed fuel is forced from the bulb to the return line to the tank. If not, I'd replace the primer bulb. What have you tried so - Answered by a verified Mechanic. It was not fuel filter, line, or primer! I have to loosen the water Separater and the bulb reinflates and she runs great for another 15 to 30 min untill the bulb collapses again. We use cookies to give you the best possible experience on our website. They only lasted 2-3 days on a kicker motor. New of these 3 didn't change anything. I'm new to outboards. Hold the primer bulb vertically with the arrow facing the sky and squeeze the primer bulb until it is completely collapsed. I am having primer bulbs problems of my own. If the bulb stays collapsed it usually means there is a restriction between the fuelfilter, line out to the carb, or the carb itself. I have a Merc 80 Hp (1983ish) The motor runs great except while running at speed (3800 to 4200rpm) the primer bulb collapses and shuts down the fuel. Source(s): primer bulb weed eater prime stays pushed in: https://biturl.im/0TKkk We use cookies to give you the best possible experience on our website. Replaced and have a second flat bulb (within 3 days). I have gone thru 2 bad primer bulbs in a row within 2 weeks. Any ideas … i have 2 mowers with identical briggs 6.5 hp engines- both model 123K02. is this how the float bowl vents? they have the primer bulb mounted on the side of the rear housing that holds the air cleaner. Looks like i'm having the exact same problem as you FB. I had a brand new Moeller bulbs (3/8" line) go flat, I subsequently replaced and found that the check valve side was leaky. If the primer bulb airlocks and won’t seem to get any fuel: Disconnect the fuel line from the engine side of the bulb. I am thinking of replacing the fuel lines, Bulb and water separator. Primer bulb vertically with the arrow facing the sky and squeeze the primer.... Skidsteer, serialJA: Are you fixing this yourself could be defective not. Return line to the side where you pulled the hose off to allow to! I put on a new 150 yamaha somewhere else that is providing vent. 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