While i was running back to ladysmith after the silva bay derby i noticed my primer ball was collapsed while i was running. It would randomly collapse and had to be replaced. What have you tried so - Answered by a verified Mechanic. I had a brand new Moeller bulbs (3/8" line) go flat, I subsequently replaced and found that the check valve side was leaky. I just finished podding my malibu and i put on a new 150 yamaha. When the bulb is pressed fuel is forced from the bulb to the return line to the tank. They only lasted 2-3 days on a kicker motor. 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. We use cookies to give you the best possible experience on our website. It could be defective and not opening consistently on the intake side, causing vapor-lock when running. I am having primer bulbs problems of my own. It was not fuel filter, line, or primer! When the bulb expands it draws fuel through the filter into the line and through the carb to the bulb. i can never see any fuel coming out as i vigorously depress the primer bulb. We use cookies to give you the best possible experience on our website. 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. Any suggestions? Any ideas … Source(s): primer bulb weed eater prime stays pushed in: https://biturl.im/0TKkk 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? If not, I'd replace the primer bulb. is this how the float bowl vents? With the arrow pointing to the side where you pulled the hose off. Is there a bad seal somewhere else that is providing a vent to allow it to leak from the primer bulb hole? I have gone thru 2 bad primer bulbs in a row within 2 weeks. 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. one primer bulb has a hole in the middle, the other does not. Why did my primer bulb collapse in my bobcat skidsteer, serialJA: Are you fixing this yourself? If the bulb stays collapsed it usually means there is a restriction between the fuelfilter, line out to the carb, or the carb itself. Purchased new primer bulb, does the same thing stays pushed in. 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. I'm new to outboards. they have the primer bulb mounted on the side of the rear housing that holds the air cleaner. Hold the primer bulb vertically with the arrow facing the sky and squeeze the primer bulb until it is completely collapsed. I am thinking of replacing the fuel lines, Bulb and water separator. If the primer bulb airlocks and won’t seem to get any fuel: Disconnect the fuel line from the engine side of the bulb. The fuel line and primer ball is new from yamaha. Replaced and have a second flat bulb (within 3 days). New of these 3 didn't change anything. 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. Looks like i'm having the exact same problem as you FB. i have 2 mowers with identical briggs 6.5 hp engines- both model 123K02. Back to ladysmith after the silva bay derby i noticed my primer ball is from! I 'm having the exact same problem as you FB defective and not opening consistently on the intake side causing... Serialja: Are you fixing this yourself line and primer ball was collapsed while i was.! Model 123K02 it would randomly collapse and had to be replaced source ( s ): primer has... Carb to the side of the rear housing that holds the air cleaner see. 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