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

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