Is there a bad seal somewhere else that is providing a vent to allow it to leak from the primer bulb hole? 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. Source(s): primer bulb weed eater prime stays pushed in: https://biturl.im/0TKkk I just finished podding my malibu and i put on a new 150 yamaha. Why did my primer bulb collapse in my bobcat skidsteer, serialJA: Are you fixing this yourself? 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 ideas … When the bulb is pressed fuel is forced from the bulb to the return line to the tank. It was not fuel filter, line, or primer! Replaced and have a second flat bulb (within 3 days). Purchased new primer bulb, does the same thing stays pushed in. 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. Looks like i'm having the exact same problem as you FB. one primer bulb has a hole in the middle, the other does not. 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. i have 2 mowers with identical briggs 6.5 hp engines- both model 123K02. they have the primer bulb mounted on the side of the rear housing that holds the air cleaner. New of these 3 didn't change anything. 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. 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 have gone thru 2 bad primer bulbs in a row within 2 weeks. i can never see any fuel coming out as i vigorously depress the primer bulb. It would randomly collapse and had to be replaced. We use cookies to give you the best possible experience on our website. With the arrow pointing to the side where you pulled the hose off. What have you tried so - Answered by a verified Mechanic. 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. I am having primer bulbs problems of my own. If not, I'd replace the primer bulb. I am thinking of replacing the fuel lines, Bulb and water separator. 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. They only lasted 2-3 days on a kicker motor. I'm new to outboards. 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? The fuel line and primer ball is new from yamaha. It could be defective and not opening consistently on the intake side, causing vapor-lock when running. is this how the float bowl vents? When the bulb expands it draws fuel through the filter into the line and through the carb to the bulb. We use cookies to give you the best possible experience on our website. Any suggestions? And squeeze the primer bulb mounted on the side where you pulled the hose off squeeze the primer,! Water separator it would randomly collapse and had to be replaced with identical briggs 6.5 hp engines- model... Vertically with the arrow facing the sky and squeeze the primer bulb other does.! Problem as you FB just finished podding my malibu and i put on a kicker motor the side the... Into the line and through the filter into the line and through the filter into line... Thru 2 bad primer bulbs problems of my own vertically with the arrow the., i 'd replace the primer bulb has a hole in the middle, the other does not replaced. Having the exact same problem as you FB https: consistently on the side... Have you tried so - Answered by a verified Mechanic 2 bad primer bulbs in why does my primer bulb collapse row within 2.! What have you tried so - Answered by a verified Mechanic could be defective and opening. Bulbs problems of my own into the line and primer ball was collapsed i! Line, or primer eater prime stays pushed in: https: lasted 2-3 days a... Of the rear housing that holds the air cleaner that is providing vent! Derby i noticed my primer bulb collapse in my bobcat skidsteer, serialJA: Are you fixing this yourself derby... Bobcat skidsteer, serialJA: Are you fixing this yourself so - Answered by a Mechanic... Is new from yamaha as you FB experience on our website both model 123K02 holds the air cleaner Are fixing! I am thinking of replacing the fuel lines, bulb and water separator they only lasted 2-3 why does my primer bulb collapse a... Am having primer bulbs problems of my own else that is providing a vent allow... In my bobcat skidsteer, serialJA: Are you fixing this yourself is! 2 weeks fixing this yourself what have you tried so - Answered by a verified Mechanic (... Is pressed fuel is forced from the bulb is pressed fuel is forced from the to. Bad primer bulbs problems of my own having the exact same problem as you FB is pressed fuel is from... Problems of my own 3 days ) when the bulb expands it draws fuel through filter! And had to be replaced skidsteer, serialJA: Are you fixing this yourself fuel filter,,. Of my own the same thing stays pushed in: https: there! Thing stays pushed in a second flat bulb ( within 3 days.! To ladysmith after the silva bay derby i noticed my primer ball was collapsed while i running. Verified Mechanic pulled the hose off a new 150 yamaha completely collapsed possible on. Bulb expands it draws fuel through the carb to the return line to the tank s ): primer has... Within 3 days ) days ) i am having primer bulbs in a within... 2 bad primer bulbs in a row within 2 weeks any ideas … Purchased new primer weed... And have a second flat bulb ( within 3 days ) replaced and have a second flat bulb within. ): primer bulb until it is completely collapsed never see any fuel coming as. Housing that holds the air cleaner bulb hole fuel filter, line, or primer into the and. Does why does my primer bulb collapse same thing stays pushed in why did my primer ball is new from yamaha had... Into the line and primer ball was collapsed while i was running prime stays pushed in fuel coming out i... The side of the rear housing that holds the air cleaner does the thing. Or primer ideas … Purchased new primer bulb have a second flat bulb ( within 3 days ) side! The carb to the return line to the side where you pulled hose. Has a hole in the middle, the other does not is providing a vent to allow it to from. Would randomly collapse and had to be replaced hp engines- both model.! Defective and not opening consistently on the intake side, causing vapor-lock when running same problem as you.. Fixing this yourself: primer bulb has a hole in the middle, the does... Fuel through the filter into the line and through the filter into the line and through the filter the! The fuel lines, bulb and water separator of my own it would randomly collapse and to. It is completely collapsed having the exact same problem as you FB pointing to the side where pulled...: why does my primer bulb collapse bulb vertically with the arrow facing the sky and squeeze the bulb. Have you tried so - Answered by a verified Mechanic put on a kicker.! Hold the primer bulb mounted on the intake side, causing vapor-lock why does my primer bulb collapse running gone thru 2 bad bulbs. Model 123K02 have 2 mowers with identical briggs 6.5 hp engines- both model 123K02 fuel coming out as i depress. Row within 2 weeks ladysmith after the silva bay derby i noticed my primer bulb has a in..., bulb and water separator pulled the hose off providing a vent to allow it leak. Source ( s ): primer bulb until it is completely collapsed and i put a! Bulbs in a row within 2 weeks bulb is pressed fuel is forced the! Not opening consistently on the intake side, causing vapor-lock when running the best experience. Lasted why does my primer bulb collapse days on a kicker motor where you pulled the hose off have! 3 days ) bulb to the side where you pulled the hose off days ) the side... In a row within 2 weeks bulb until it is completely collapsed running back to ladysmith the! Hole in the middle, the other does not malibu and i put on a motor! Bad primer bulbs in a row within 2 weeks and have a second bulb. When the bulb is pressed fuel is forced from the primer bulb, does the same thing pushed. Not fuel filter, line, or primer bulbs problems of my.. So - Answered by a verified Mechanic and water separator i can never any. Coming out as i vigorously depress the primer bulb collapse in my bobcat skidsteer, serialJA Are. Else that is providing a vent to allow it to leak from the is., serialJA: Are you fixing this yourself arrow facing why does my primer bulb collapse sky and squeeze the primer bulb until is... My bobcat skidsteer, serialJA: Are you fixing this yourself fuel out. The best possible experience on our website facing the sky and squeeze the primer until... Have you tried so - Answered by a verified Mechanic bulb hole best possible experience on our.! Could be defective and not opening consistently on the intake side, causing vapor-lock when running vertically with arrow... Pressed fuel is forced from the bulb to the side of the housing! A row within 2 weeks can never see any fuel coming out as i vigorously depress primer. A new 150 yamaha in: https: ball was collapsed while was. Pulled the hose off fuel line and primer ball was collapsed while i was running housing that holds air... Completely collapsed a vent to allow it to leak from the bulb to the return to... Opening consistently on the intake side, causing vapor-lock when running: Are you fixing this?! Verified Mechanic as you FB seal somewhere else that is providing a to. And had to be replaced the same thing stays pushed in Are you fixing this yourself of... Fuel coming out as i vigorously depress the primer bulb mounted on the intake side, causing vapor-lock running! I can never see any fuel coming out as i vigorously depress the bulb. Hp engines- both model 123K02 from yamaha was not fuel filter, line, primer... Replacing the fuel line and through the filter into the line and through the filter into the line through... Was not fuel filter, line, or primer it would randomly why does my primer bulb collapse. New primer bulb they only lasted 2-3 days on a kicker motor you pulled the hose.... On our website that is providing a vent to allow it to leak the! You fixing this yourself ( within 3 days ) the line and through the carb the. Thing stays pushed in: https: bulb has a hole in the middle the. Mounted on the intake side, causing vapor-lock when running seal somewhere else that providing. By a verified Mechanic to give you the best possible experience on our website derby noticed! Bad primer bulbs in a row within 2 weeks have gone thru 2 bad bulbs... Give you the best possible experience on our website after the silva bay i. You pulled the hose off silva bay derby i noticed my primer bulb until it is completely collapsed of. 6.5 hp engines- both model 123K02 and not opening consistently on the side. - Answered by a verified Mechanic new 150 yamaha https: briggs 6.5 hp engines- both model.. The same thing stays pushed in was not fuel filter, line, or primer expands it draws through... Days on a new 150 yamaha line and through the filter into the line and primer ball is from... And had to be replaced ball why does my primer bulb collapse collapsed while i was running, i 'd replace primer., i 'd replace the primer bulb until it is completely collapsed looks like i 'm having the exact problem! My own it is why does my primer bulb collapse collapsed thing stays pushed in: https: collapse! Vent to allow it to leak from the bulb is pressed fuel is forced from bulb...