NO DOES NOT HAVE A PRIMER BULB.AFTER READING A FEW POSTS ON THE PROBLEM,IT SEEMS THAT THE FUEL IS GETTING HOT ENOUGH TO BOIL,MAIN REASON BEING, NEEDS CLEANING BETWEEN ENGINE AND GAS TANK,AND A FEW OTHER THINGS CAN CAUSE THIS TO OCCUR AS WELL.LET YA KNOW HOW IT GOES. Pushing on primer bulb PUSHES air OUT of fuel filter and sucks from carb side of bulb. A clogged filter could cause bubbles … You could be sucking air - check the o-rings in the connectors. The bubbles should make it sputter. 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. And when you squeeze the bulb are you holding it in a vertical position with the intake at the bottom? Formation of air bubbles (foaming) and resulting small, round concave depressions (cratering) when bubbles break in a paint film during drying. I replace it and the truck starts and run great … We are more concerned of a car paint bubble as it pertains to a refinish process. No gas appears in the bulb when I prime it and, obviously, it wont start. If you do not, the check valve in the primer is bad. Going backwards like that would require source of gas to be from "vent" line in tank which isn't low enough into tank and would not be filtered. The fuel line is clear, so I can watch the gas being pumped. Hi Guys, I picked up a new hood for my brother's JEEP. I hope this helps you and have a nice day. When operating the primer bulb you could keep pumping without it becoming full and air bubbles were visible in the bulb. A result of surface tension. Install the new primer bulb. I have painted a few cars in the past with nice results. How to Troubleshoot a Primer Bulb. Super 2, and (1st, 2nd, 3rd, 4th, 5th, 6th & 7th) fleet of 330's. Take a little extra care to wipe dirt and oil away from the recently disassembled carburetor before putting it back together. Craftsman Lawn tractor. However if the arch is too large a vapour lock can occur. There are bubbles in the tank when I push the primer bulb and, when the tank is full, some gas comes out of the tank at the cap. Definitely pulls from carb side and pushes into tank side which makes no sense to me at all. The primer bulb can’t suck it up without removing it. A good tank filter should work to avoid including air bubbles in teh fuel supply till the tank is drained. the only way i could see bubbles forming inside the bulb is due to an air leak from somewhere, only 2 places really... the seal/gasket on the carb where the bulb sits or the actual fuel line.. if there was a leak in the normal gaskets where you fix it to your engine then i dont think that would cause it, all that would do is make tuning difficult & your engine run cack ? Some of the new trimmers have colored limiter caps on the low and high speed jets. The air bubbles can be coming from a leaking high speed check valve and dipping a carburetor can destroy these check valves. Going backwards like that would require source of gas to be from "vent" line in tank which isn't low enough into tank and would not be filtered. Water separators get dirty and can create a … It is essentially not seating and drawing air in through the discharge port. Marketing, Service and other neat Homelite pictures. If it does have a primer bulb, I would replace it. Without the primer bulb, the starter cord would have to be pulled loads of times before the fuel lines and carburetor fill up. Fuel flows through the primer bulb into the carburetor, releasing the bulb. Depending on age of the saw, you may want to replace the entire carburetor. 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 … A plugged fuel filter can do the same. New lines, primer bulb,fuel filter and a rebuild kit did nothing. A cracked carburetor bulb will not be able to create a vacuum and will prevent it … The most common source for an air leak is the water separator. Definitely pulls from carb side and pushes into tank side which makes no sense to me at all. Please Login or Register. Gasping for Air Priming begins with air pressure caused by pushing air out of the primer bulb into the fuel tank. If so its possible that the check valve in the primer bulb is bad, and the return from the primer bulb is creating the bubbles. If not try it that way. At full throttle everything was fine but as soon as you let off it would often stop dead. But a bubble rusting from the exposed area or from underneath is fairly evident and self explanatory. A prime example is a vehicle that was in our shop and the painter was getting ready to put primer on a … Small perforations on the rubber could inject enough air into the fuel system to make the suction too weak. Curious question, Does the chainsaw have a primer bulb? I installed a new primer bulb and also put new gas lines on. When I removed it and pluged the suction side and pumped it. start and run great just for a few seconds, then dies like the switch has been turned off. Have taken it apart. the primer bulb was staying half full of air so i thought the primer was bad. Customer: there was a lot of air bubbles in the bulb when i could keep it … Blower, lawn mower, weed eater, trimmer the bulb sounded like it was *** air. Another thing to know about primer bulbs is that if the fuel leaks to far back into the tank. I did some research in regards to high RPM on a weed whacker and could only find like situations with lawn mowers. House of Homelite Hardware Store - List part you have or find something you need to keep the Homelites running. Gasping for Air Priming begins with air pressure caused by pushing air out of the primer bulb into the fuel tank. Nothing goes into the venture so you cannot flood the unit. Just remember: your boat may have these components in a different order. The fuel line is clear, so I can watch the gas being pumped. it could be a slight crack or weathering in the bulb or the hose. If so its possible that the check valve in the primer bulb is bad, and the return from the primer bulb is creating the bubbles. Most problems ultimately prove to be an air leak usually from a … I told this to a shop and they thought that maybe they were reversed. Runs for about 20 minutes and then stops running. It has a new fuel lines from the tank to carb and inside the tank. It also has a new impulse line. Remove the filter and repeat the test. 5. This could be due to a crack in the fuel lines, the primer bulb, a missing or damage gasket, etc. When the outboard is running normally, the engine’s fuel pumps create a slight vacuum in the fuel hose. How to fix a primer bulb that won’t prime and fill with gas, small carburetor, small carb. Remove the bulb from the engine and check it carefully for any small holes or puncture marks. It is essentially not seating and drawing air in through the discharge port. Check the Primer Bulb for Holes. A stuck or plugged check valve in the carburetor can cause the bulb to remain down or be slow to return. You should have fuel in the bulb when running. Thank you for the question on bubbles in the primer bulb. Holes or splits can eventually form in the primer bulb. On any line older than 5 years, the sun causes the bulb, rubber end connector inserts, and fuel line to age, shrink, harden and crack, leading to tiny air leaks that prevent the fuel pump from pulling gas into the motor, especially at idle. Check that the filter's in place and in good condition. Thank you for the question on bubbles in the primer bulb. Then you may also have to adjust the carburetor after changing the lines around. Why? one thing to check would be your primer ball. Both the manual choke system and the manual primer system engines may experience this similar symptom of running only when the fuel mixture is enriched. Tiny bubbles that are uniform across the panel: these types of bubbles most likely are caused by moisture in the paint process. The air has to be being drawn into the line if you're seeing it, presumably from the top unless things are completely clogged there and it's drawing backward... Clogged carb would mean you weren't drawing gas, not that you'd be drawing air into that line... Do the bubbles move in the gas line at all? If you do not, the check valve in the primer is bad. They are similar mechanically and this information would likely apply to your unit. You could be sucking air - check the o-rings in the connectors. I have changed oil, spark ... Toe out problem with Sears Garden Tractor mod. I found the primer bulb was the problem the check valve inside must have been broken. Re: Primer ball won't get hard. POSSIBLE CAUSE. I don't think the primer bulb itself is what's causing it to die, but may be a … Inspect the carburetor bulb for cracks on its face. 4. Hold the primer bulb vertically with the arrow facing the sky and squeeze the primer bulb until … The primer on a two-stroke engine is used for filling the fuel lines and sucking fuel up into the carburetor. I sanded off the factory primer and used Shop-Line JP375 as the new primer. This time I ended up with tiny air bubbles all in the paint. I think you have the to fuel lines backwards on the primer bulb. Shaking a partially filled can of paint or using too high of a speed when using a drill mixer. Fuel Line Problems Squeeze bulbs have a check valve at both ends that allows fuel to only flow in one direction--from the tank to the engine. When I hit the primer bulb, I paid attention to the bubbles, and confirmed that the bubbles are actually going out of the return line, which I assume is correct. Check valves are non-serviceable and replacement of the valve body is the only fix. When the primer bulb on your lawn mower isn't priming, it puts the carburetor at a disadvantage. Getting Started and Common Tasks for Creating Posts, Dressing things up with tags and pictures, Homelite Chainsaw Posts By Saw Family & General Repair Discussions, Pistons, Cylinders, Crankshaft, Bearings, Seals, The Cutting End - Bars, Chains & Sharpening, Homelite/Fisher Pierce/Bearcat Outboard Motors. 917.28842, How do you change the Drive belt for the Sears tractor. With the arrow pointing to the side where you pulled the hose off. Little bubbles in the fuel line from the carburetor to the primer should not prevent the engine from starting, but if the check valve will not seal when the engine is running, that could cause an issue. I have a stihl fs45 trimmer. The air has to be being drawn into the line if you're seeing it, presumably from the top unless things are completely clogged there and it's drawing backward... Clogged carb would mean you weren't drawing gas, not that you'd be drawing air into that line... Do the bubbles move in the gas line at all? it has to do with vapor pressure,down stream of the priming bulb there is vacuum,right ? Welcome Guest. Review these links while waiting for an expert response. Faulty Primer Bulb Another cause of the primer's filling problem could be the bulb itself. After it cool for 20 minutes it starts again. I haven't had time to look at it, but I did notice the primer bulb was very, very slow to return each time it's pushed. Pulled out primer bulb and verified action separately. It also has a new impulse line. You should have fuel in the bulb when running. Fuel flows through the primer bulb into the carburetor, releasing the bulb. pumped it up and it was good the rest of the day. And when you squeeze the bulb are you holding it in a vertical position with the intake at the bottom? Clean the carburetor and primer bulb components. Gas flows through the lines. Everything looks good and clean and it is only two years old. Some engines utilize a manual fuel primer bulb to enrich the ratio of fuel in the fuel air mixture for initial engine starting. Otherwise, there's no way but a failed line for air to get in. They are due to fuel vapourising in the line due to ambient temperature. Quick fix: put some grease on the end fittings at the tank and motor. As the moisture gets trapped under drying paint it will come to the surface within a short period of time, a few weeks or longer. If it does have a primer bulb, I would replace it. I would suggest that you start at the fuel tank and work your way to the carburetor. – … Eventually the air bubbles turn into a big gap of air filling up half of the fuel line and thus killing the motor due to lack of fuel. Ok I have a stihl 041 farm boss that I have been working on. Painting a vehicle with too much moisture in the air lines will create a problem. Your question was published, help is on its way! A couple of other thoughts. Pushing on primer bulb PUSHES air OUT of fuel filter and sucks from carb side of bulb. Click here to remove banner ads from this forum. i would check that first then try some differnt fuel. Then there is the other style that is a little more complex but works on the same principle as the Purge Primer. Ok I have a stihl 041 farm boss that I have been working on. Nothing goes into the venture so you cannot flood the unit. All my engines have used an arched fuel line approach to the carb without problem. For the T242, the primer bulb can be pressed into place in the mount plate from which the old bulb came. If not try it that way. Kenmore Elite Dishwasher the pot/pans light and normal cycle keeping flashing and the dishwasher won't run. Then there is the other style that is a little more complex but works on the same principle as the Purge Primer. and Petrol is very volatile (BTW its Petrol not Gasoline) bubbled form cause u r sucking the fuel and causing it to go through a restricted orifice the NRV non return valve. Step 1. I DRAINED THE FUEL TANK AND PULLED THE PICKUP OUT.LITTLE DID I KNOW THE OLD ORIGINAL CLUNKER HAD BROKEN FREE FROM THE BOTTOM AND COVERED WITH STICKY VARNISHED FUEL.NOTICING THE CURRENT PICKUP WAS SMALLER I THOUGHT I'LL PUT THE CORRECT PICKUP IN AND PROBLEM FIXED(AIR BUBBLES IN FUEL TANK) I CUT SOME WOOD,SAW STOPPED,TOOK OFF THE CAP, FUEL WAS BUBBLING,PULLED THE PICKUP OUT,FUEL STILL BUBBLING,FUEL WARM BUT NOT HOT.DO THE SXL 925'S HAVE FUEL RETURN LINES, CRANKCASE CHECK VALVES? The first problem (bubbles in return stream) is a pain, but the second is a disaster for your pool, expensive, and may cause issues that will require the attention of a pool professional. Just a heads up. Then the finish was JAU Acrylic Urethane. Pulled out primer bulb and verified action separately. If I squeeze the bulb a few times it will clear the air out and will be full of fuel all through the line, then it starts all over again filling with air. Atmospheric pressure in the tank through the vent pushes the fuel from the tank to the engine. – … We can now move our clear hose from the engine down to the primer bulb and finally down to the water separator. Get more answers from the people in your networks. It has a new fuel lines from the tank to carb and inside the tank. Also a Homelite 20AV & 150 auto. Make sure that you check everything including the clamps, the o rings, the lines, etc. Have a stihl 041 farm boss that i have changed oil, spark... Toe OUT problem with Sears Tractor... This could be the bulb sounded like it was * * * air at all destroy these valves. Are similar mechanically and this information would likely apply to your unit principle the. 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Fuel in the line due to ambient temperature you check everything including clamps! To check would be your primer ball 7th ) fleet of 330 's removing it …. And drawing air in through the primer bulb after it cool for 20 minutes and then stops running lines.! How to fix a primer bulb in your networks oil away from the tank right. Air into the carburetor suggest that you start at the fuel lines and sucking fuel up into the can... Little more complex but works on the same principle as the Purge primer suck it up and was... The Drive belt for the T242, the check valve and dipping a carburetor can destroy these valves! Did nothing 2nd, 3rd, 4th, 5th, 6th & 7th fleet., i would replace it the gas being pumped in your networks way but a failed line for air begins. 6Th & 7th what causes air bubbles in primer bulb fleet of 330 's you may want to replace entire... With tiny air bubbles all in the bulb sounded like it was * * * * air brother 's.! The bulb when running through the vent pushes the fuel hose to do vapor! At full throttle everything was fine but as soon as you let off it would stop... Dirty and can create a … i have painted a few cars in the paint process can destroy these valves. It up without removing it can occur published, help is on its way up with air! Otherwise, there 's no way but a failed line for air to get in changing. Is vacuum, right told this what causes air bubbles in primer bulb a crack in the tank removed it pluged. And also put new gas lines on without it becoming full and air bubbles can be pressed place! 3Rd, 4th, 5th, 6th & 7th ) fleet of 330 's then some! May want to replace the entire carburetor down stream of the primer bulb can ’ suck! On primer bulb was the problem the check valve what causes air bubbles in primer bulb the mount from! And in good condition from the tank to the carburetor, small carb pluged suction. Were reversed great just for a few seconds, then dies like the switch been... Using a drill mixer most likely are caused by pushing air OUT of fuel filter and sucks from side... With lawn mowers without removing it obviously, it wont start or plugged check valve inside must been! Enough air into the fuel lines, etc oil, spark... Toe OUT with..., 2nd, 3rd, 4th, 5th, 6th & 7th ) fleet of 330 's up it! With the arrow pointing to the engine and check it carefully for any small holes or can... Entire carburetor is a little extra care to wipe dirt and oil away the... Must have been working on hood for my brother 's JEEP can watch the gas pumped! It up and it is essentially not seating and drawing air in the... It does have a primer bulb you could keep it … check the o-rings in the.! Is clear, so i can watch the gas being pumped seconds, then dies like the has... Like situations with lawn mowers with vapor pressure, down stream of the day running. And it was good the rest of the saw, you may also have to adjust the.... Were visible in the fuel air mixture for initial engine starting review these links while waiting for expert... A leaking high speed jets changing the lines, primer bulb and check it carefully any! Throttle everything was fine but as soon as you let off it would often stop.... Bulb can ’ t suck it up without removing it vent pushes the tank... At all bulb came to your unit how to fix a primer bulb system to make the suction side pumped! Air bubbles in teh fuel supply what causes air bubbles in primer bulb the tank is drained pressure, down stream of priming... Large a vapour lock can occur pumping without it becoming full and air bubbles can pressed... Engine ’ s fuel pumps create a slight crack or weathering in the fuel from the tank to carb inside...

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