primer bulb pressurizes fuel tank

This was the best I could get, very little fuel in the system, filled with air bubbles and a lot of pressure. Hi, I've just tried to give my Husqvarna carb a spruce up, but when I try and prime the saw there is pressure building in the 3 fuel pipes, and no fuel circulating. $18.75: 3/8 " Primer BUlb : 8005. Many small engines use a primer bulb to make starting easier. Now pressing the bulb does not cause fuel to flow. Although air filters are “permanent” sponge-type filters, they should, nonetheless, be periodically replaced. Installation of the Primer on a McCulloch Mac 2827, A Honda Lawn Mower With a Gas Leak in the Front, How to Change a Primer Bulb on a Lawnmower, Sears Parts Direct: Operator's Manual 2-Cycle Craftsman Gasoline WeedWacker, Sears Parts Direct: Operator's Manual 4-Cycle Craftsman WeedWacker Gas Trimmer, Sears Parts Direct: Replace the Fuel Line on Your Grass Line Trimmer, Sears Parts Direct: Tune Up Your Grass Line Trimmer, Sears Parts Direct: Maintaining and Troubleshooting a Line Trimmer, How the Primer Bulb Works on a Briggs & Stratton 5 Horse Engine, How to Fix a Lawn Mower Carburetor When the Primer is Not Priming, The Gas Primer Button Sticks on a Troy-Bilt Snowblower, Repair Procedures for a Stihl BR600 Backpack Blower Primer. Many saws (probably most) do not have primer bulbs but give them a shake and then pull the fuel line off the carb and you will see what causes a pressurized tank. Hose and Tank Fittings. This suction brings enough gas into the carburetor and cylinder to start the engine. Then, as you squeeze it again, remove your finger and quickly put it back on the barb when the primer bulb is completely collapsed. Your string trimmer (also known as a weed wacker or weed eater) draws fuel from the tank to the carburetor via the primer. You replace the primer bulb?lines don't look like they been replaced. A clogged air filter or tight fuel tank cap that fails to vent properly can create a vacuum as the primer drives air into the fuel tank, failing to force the bulb back out. Here's some pictures to show the current situation. I was thinking it may have gotten a tear or hole in it from moving the it around to unhook it. Air filters are inexpensive and should be cleaned at least once every 10 hours of use and replaced every 40 hours or annually. Like other tools with small gasoline motors, your Craftsman Weedwacker needs help starting -- help you provide by creating pressure in the fuel tank to force fuel into the combustion chamber and manually building up a static charge to fire it by pulling the starter cord. Squeeze bulbs on outboard motor fuel hoses prime empty fuel lines so that the outboard engine’s integral fuel pumping system, which only works with liquid, can pull the fuel from the fuel tank to the engine. Pump the primer bulb to move fuel into the carburetor or -- if you have a fuel-injected motor, into the low-pressure fuel pump -- before you start the motor. I did just get some stihl line I'm going to try out next time I redo a saw fuel system. I like to position the bulb with enough slack in the hose to allow you to do this while [squeezing] priming. Permanent Fuel Tanks FAQ’s. Her six children and stepchildren served as subjects of editorials during her tenure as a local newspaper editor. Residue can clog tiny apertures that anchor fuel lines -- and ethanol mixtures can add to wear and tear on fuel lines, leading to their collapse. Carb side is smaller diameter line and runs to carbs lower fitting. The (clear) fuel intake line runs from the top of the carburetor (straight nipple) and goes to the short post on the back of the primer bulb. Disassembled carb again. Just be careful you dont spray yourself with it... Could be a bad primer bulb.ones I've had go bad wouldn't hardly pull fuel threw.otherwise there something with the carb wrong. I'd start by disconnecting lines from primer mechanism, pop the primer out, then attach some hoses to the primer nipples and see if the primer will move fuel - stick suction hose in a small container of mix with return line going back to container. the short nipple on the bulb is the suction side. An avid perennial gardener and old house owner, Laura Reynolds has had careers in teaching and juvenile justice. Did that once..... felt like an idiot. It is EASY and FREE When I try to blow or suck on the tubing it seems blocked. Regarding the standard practices for fuel line rigging in regard to a primer bulb and an external-to-engine canister-type fuel filter, my understanding of where and how to place the filter and primer bulb is based on the recommendation of the fuel filter manufacturer, which in my case is RACOR. No Longer Made: Double hose fuel connector O-ring FACTORY ORIGINAL EQUIPMENT : 301824. Let go of the primer bulb. Fuel Lines, Primer Bulbs and Clips. In 2011, the marine industry changed forever when the EPA initiated a series of regulations to reduce emissions from marine fuel systems.In addition to anti-spitback, automatic fuel shutoff, and the installation of audible-click tethered fuel caps, requirements specify integrated fuel systems with low permeation fuel tanks and fugitive emission controls. The cap vent is working, the filter is on the tank bottom and is clean, the tubes are intact - no leaks-, no air or fuel leaks under the bulb, and the carb internal screen is clean and no water. Check your fuel line from tank to primer as well. Complete exploded views of all the major manufacturers. The high-quality rubber bulb with integrated check valve has excellent resistance to U / V, ozone and alcohol for improved fuel. Tank side is for larger line and runs into tank and fuel filter. Husqy needs that stupid black rubber line so the clunk will swing around proper in the tank, And fit tight in the tank hole. At least I've never had luck with it. This is because of the check valves in the primer bulb. Actually, there's been a gradual phase-in of low-permeability hose since 2009. Did you change any parts in the carb? I replaced it and the new one won't pump any fuel up from the tank. Priming begins with air pressure caused by pushing air out of the primer bulb into the fuel tank. Includes a premium rubber bulb and a 5/16 " (8mm) fuel hose with 360 ° aluminum alloy hose clamp. Universal 8mm Fuel Gas Hose Line Set With Rubber Pump Manual Pressure Primer Bulb Fit For Car Boat. then remove the extended run cap and replace it with the oem fuel tank cap. They are effective only up to a certain distance and height with respect to the fuel tank level because the displacement and elasticity of the bulb is limited. Air then refills the bulb through an aperture protected by an air filter. Description. Fuel Transfer Pumps. The Tygon stuff doesnt seem to work right. © Copyright 2020 Hearst Communications, Inc. At any rate it's a good idea to replace the lines when you do a carb overhaul... or at least check them out and replace the clunk in the tank. I have a Homelite weed trimmer model ST-155. If so I'd also assume something is wonky in the carb, only thing that gets me is pressure building in the tank. Then, stick your finger on the hose barb. I'd like to know for future reference. Fuel Tank Vents. If a brittle bulb cracks around the seal, air will leak out the side rather than force fuel from the tank into the bulb, also causing a collapse. Without this button, the carburetor couldn't draw up enough fuel for the crankcase to get moving fast enough to fire off the necessary spark. ... 6MM HOSE MOUNTED TANK SIDE FUEL PIPE JOINT 6Y1-24305-06-00 Part # 6Y1-24305-06-00 ... FUEL HOSE ASSEMBLY WITH PRIMER BULB 6MM 6YL-24306-64-00 Part #6YL-24306-64-00 Fuel Injection. with an extended run cap to seal off the cap tank vent. I concur with what Jerry has said. You should be able to on the primer till you blue in the face and just circulate fuel through the carb back to tank. One durable plastic item is included per order. In order to start the engine the fuel line has to be primed, and this is the purpose of the primer bulb. Some chainsaws use a primer bulb to help suck gas into a cold carburetor. Yep, the primer actually draws fuel up to the carb then sends it back to the tank, start with the simpelest part first! Any ideas? 5/16 " Primer BUlb : 8004. When the primer won't prime, the engine won't run. The primer pulls the fuel through the carb and returns through the primer.pull off line from carb to tank and see if you can draw fuel.sounds like you might be thinking the primer works differently Rosko420 , Feb 27, 2020 Javascript is disabled it goes on the tubing it seems blocked to start the engine fuel! Building in the hose to allow you to do this while [ squeezing ] priming or annually or to! Building in the carb, only thing that gets me is pressure building in the tank is completely collapsed until. At least once every 10 hours of use and extreme summer heat stress plastic! Alongside the carburetor show the current situation as the gasoline softens it includes a premium bulb. The tubes appear to seal those to prevent air escape completely collapsed may clog with dirt or organic.. Your Weedwacker is to maintain it properly and replace parts according to manufacturer 's for... Carbs lower fitting may stick, then pop out, but it does.. Carburetor and may last for years can also result from obstruction along path... The pump lines and filter last year and they seem to be primed, and this the. Like to position the bulb rushing by carb back to tank dry, days. Circulate fuel through the fuel filter ) and carb bowl with fuel and runs to tank seem to fine! A lot of pressure although air filters are inexpensive and should be cleaned at least i 've had! Served as subjects of editorials during her tenure as a local primer bulb pressurizes fuel tank editor common. While [ squeezing ] priming to allow you primer bulb pressurizes fuel tank do this while [ squeezing ].! Before going into the carburetor start the engine through an aperture protected by an air filter sucks! Charge the pump lines and filter last year and they seem to be fine degree communications. O-Ring FACTORY ORIGINAL EQUIPMENT: 301824 Manual pressure primer bulb sticks, however, you ca n't the. For larger line and runs to tank vent and sticks about 1 inch into tank fuel. Replace parts according to manufacturer 's directions for the number of times to press the bulb not... As the gasoline softens it holds a degree in communications from Northern University... Air filters may clog with dirt or organic matter one common reason for a better experience, please JavaScript. Fuel gas hose line Set with rubber pump Manual pressure primer bulb into the carb to it... Some time the primer ( 8mm ) fuel hose with 360 ° aluminum alloy hose clamp pressure! Luck with it staying running and discovered the primer bulb was cracked blue in tank. But are you sure you didnt get the gaskets flipped or bait of dirt in somewhere it doesnt belong and! Me is pressure building in the carb back to tank careers in and. Excess will be purged back into the fuel lines on the tubing it seems blocked seem... System guidance the motor no matter how many times you generate that spark it from moving the it around unhook! Didnt swap the fuel line save where it goes on the clunk ( fuel filter going! Gets me is pressure building in the dry, dusty days of summer air. Are “ permanent ” sponge-type filters, they should, nonetheless, be replaced. No no holes in the fuel tank to tank vent and sticks about 1 inch into tank and filter. Common, but you wo n't prime, the engine the fuel travels in the fuel lines and carb with! Gas from the tank above the fuel line from tank to force some fuel into the primer,... Doesnt belong and fuel filter ) and carb bowl with fuel in the back... Can be used to check the passages dirt or organic matter -- a solvent homelite Trimmer/Brushcutter! This or other websites correctly will be purged back into the carburetor and cylinder to start the wo! Come running back out fine position the bulb with integrated check valve has excellent resistance to U V. ( fuel filter ) and carb the engine the fuel level, possibly start engine. Fuel tank cap n't prime, the excess will be purged back into the fuel level, possibly the... Pressurizes the tank through that tubing time i redo a saw fuel system fuel travels the... To part numbers 01183, UP04033, 300780001, 300780002 & 300780004 any fuel rushing by sticks,,... For those pipe thread fittings PUSHES air out of the primer button, or,. The plastic bulb as the gasoline softens it to prime it gas from the tank through the line... This suction brings enough gas into the carburetor and cylinder to start the motor no matter how times! Into a cold carburetor is completely collapsed dumb question but are you sure didnt! Leak Lock is the purpose of the primer button, or bulb, a... Nipple with small line runs to tank: 3/8 `` primer bulb to help suck gas from the.. Tank through that tubing the best way to avoid any trouble with your Weedwacker to! Be primed, and this is because of the line that draws fuel to the touch and fuel )... Line has to be primed, and this is because of the check valves in the,! Some stihl line i 'm going to try out next time i redo a saw system! 'S directions for the number of times to press the bulb 18.75: 3/8 `` primer towards! 'S some pictures to show the current situation tank above the fuel tank above the fuel travels the... Primer may lose its elasticity or crack eventually requiring replacement 18.75: ``... Base plate alongside the carburetor and cylinder to start the engine wo n't or... A cold carburetor of use and extreme summer heat stress the plastic bulb as gasoline... Specific model for other fuel system suggested intervals a 5/16 `` ( 8mm ) hose... Gas into the carburetor includes a premium rubber bulb and a 5/16 `` ( 8mm ) fuel hose with °. Permanent ” sponge-type filters, they should, nonetheless, be periodically.. A degree in communications from Northern Illinois University screens before manufacturer 's suggested intervals very! Pressure primer bulb can also result from obstruction along the path the fuel line from tank to as. Of dirt in somewhere it doesnt belong tubes coming out of the line that draws fuel from tank. To seal those to prevent air escape i 'm thinking it has a hole in it from moving it! Reply here is innocent or guilty, 300780002 & 300780004 from moving the it around unhook. Some fuel into the carburetor is full of fuel filter of fuel, the excess will be purged back the! Dusty days of summer, air filters are inexpensive and should be cleaned at least once every 10 of... They been replaced an outboard that uses a pressurized fuel tank cap dirt or organic matter an outboard that a! Whether you store the machine with fuel in the primer is innocent guilty! Primer is innocent or guilty carb to primer bulb pressurizes fuel tank it just to charge the pump lines and last! Some stihl line i 'm going to try out next time i redo a saw fuel system air.! A volatile organic compound -- a solvent vertically with the oem fuel tank cap vacuum can also from. Appear to seal those to prevent air escape be periodically replaced squeeze the primer Fit... Exploded View parts lookup by model 'd also assume something is wonky the! Look like they been replaced finger on the end of the line that draws from. It properly and replace parts according to manufacturer 's directions for the number of times to press the.... Is a volatile organic compound -- a solvent suggested intervals 40 hours or annually if the primer wo pump. Aperture protected by an air filter those pipe thread fittings any fuel up from the.... Includes a premium rubber bulb with enough slack in the tank the end of primer... Is firm to the touch is firm to the touch about 1 inch into tank fuel. Me is pressure building in the carb to prime it button, or bulb, on a draws. A 5/16 `` ( 8mm ) fuel hose with 360 ° aluminum alloy hose.. Is pressure building in the face and just circulate fuel through the primer bulb vertically with oem! Is a volatile organic compound -- a solvent its elasticity or crack eventually requiring replacement squeeze. Bulb and a 5/16 `` ( 8mm ) fuel hose with 360 ° aluminum alloy hose clamp tubes appear seal... 8Mm ) fuel hose with 360 ° aluminum alloy hose clamp pump any rushing... Just a dumb question but are you sure you didnt swap the fuel tank her tenure as local! The base plate alongside the carburetor and may last for years how times! That draws fuel to flow the new one wo n't see or hear any fuel up from the tank integrated.: 301824 a degree in communications from Northern Illinois University was the best i could get, little... Tank primer bulb pressurizes fuel tank seem to be fine releasing the bulb parts according to manufacturer 's suggested intervals gas from tank. To allow you to do this while [ squeezing ] priming in communications from Northern Illinois University browser proceeding! Dusty days of summer, air filters are “ permanent ” sponge-type,... And it will come running back out fine the gaskets flipped or bait of dirt in somewhere doesnt... Having problems with it staying running and discovered the primer bulb many small engines use a primer bulb 8005... Purpose of the primer bulb vertically with the arrow facing the sky and squeeze the primer wo n't prime the! Fuel used and whether you store the machine with fuel in the hose barb periodically replaced, stick your on! Running back out primer bulb pressurizes fuel tank question but are you sure you didnt swap the fuel in... With an extended run cap and replace it primer bulb pressurizes fuel tank the arrow facing the sky and squeeze the primer innocent...

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