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. Check your fuel line from tank to primer as well. This prevents fuel from being forced through the fuel line by pressure in the tank … JavaScript is disabled. The Fuel Demand Valve (FDV) installs on the fuel hose between the fuel tank and primer bulb, and prevents fuel from flowing unless there is demand from the engine. Fuel Pressure Regulator. Package Inlcude: 4X Primer Bulb Fits the following models: Refer to part numbers 01183, UP04033, 300780001, 300780002 & 300780004. Primer bulb is marked tank and carb side. Intake Manifold. Hose and Tank Fittings. Tank side is for larger line and runs into tank and fuel filter. One durable plastic item is included per order. Portable Fuel Tanks, Funnels and Straps. It is EASY and FREE It pressurizes the tank to force some fuel into the carb to prime it. Depending on how often the little machine starts and its age, the inside of the bulb will eventually get gooey, causing it to stick. You should be able to on the primer till you blue in the face and just circulate fuel through the carb back to tank. Universal 8mm Fuel Gas Hose Line Set With Rubber Pump Manual Pressure Primer Bulb Fit For Car Boat. Also have huge pressure in the tank too. with an extended run cap to seal off the cap tank vent. Primer bulbs attach with two screws on the base plate alongside the carburetor and may last for years. 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. Water Separator. TIHOOD Fuel Line Assembly, 5/16" Hose Line Marine Outboard Boat Motor RVs Fuel Assembly with Primer Bulb Steel Hose Clamps 6FT (5/16"-Rubber) 4.1 out of 5 stars 268 $13.98 $ 13 . 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. You replace the primer bulb?lines don't look like they been replaced. If so I'd also assume something is wonky in the carb, only thing that gets me is pressure building in the tank. ... for an outboard that uses a pressurized fuel tank? Some chainsaws use a primer bulb to help suck gas into a cold carburetor. 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. ... 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 flows through the primer bulb into the carburetor, releasing the bulb. The primer bulb is only a " manual fuel pump " ----It is used to fill the carburetors.----------That saves the battery by not having to crank for a longer time waiting for the pump on the motor to do this.----Or it saves one from getting " popeye arms " on a manual start motor.----- … An avid perennial gardener and old house owner, Laura Reynolds has had careers in teaching and juvenile justice. Disassembled carb again. the short nipple on the bulb is the suction side. 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 can blow into the fuel line and it will come running back out fine. Fuel Tanks. 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. Just a dumb question but are you sure you didnt swap the fuel lines on the back of the primer? The only time a primer bulb will pressurize a tank is if there is a defect and and the bulb is just sucking air and no fuel is being removed from the tank. I did just get some stihl line I'm going to try out next time I redo a saw fuel system. Between the primer bulb and the carb there is a plastic part that has the tubing sticking out where the fuel line from the tank connects to. then remove the extended run cap and replace it with the oem fuel tank cap. Repeated use and extreme summer heat stress the plastic bulb as the gasoline softens it. Her six children and stepchildren served as subjects of editorials during her tenure as a local newspaper editor. Let go of the primer bulb. I like to position the bulb with enough slack in the hose to allow you to do this while [squeezing] priming. That should let you know if the primer is innocent or guilty. Fuel flows through the primer bulb into the carburetor, releasing the bulb. For a better experience, please enable JavaScript in your browser before proceeding. This is because of the check valves in the primer bulb. 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. Primer bulbs work by creating a vacuum that sucks fuel from the tank and adds pressure to force it into the carburetor. Here's some pictures to show the current situation. Actually, there's been a gradual phase-in of low-permeability hose since 2009. 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. I have a Homelite weed trimmer model ST-155. The tank has no cracks, only the tube holes and the tubes appear to seal those to prevent air escape. This is an old 3-prong fitting for a Johnson/Evinrude metal tank that included a line for pressure and a separate line for fuel… 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. It is not common, but it does happen. This pump has limited capacity to lift fuel from the fuel tank, and it only begins to function with much efficiency after the engine is running. Leak Lock is the thread sealant for those pipe thread fittings. Fuel Tank Senders. Air filters are inexpensive and should be cleaned at least once every 10 hours of use and replaced every 40 hours or annually. You are using an out of date browser. 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. No Longer Made: Double hose fuel connector O-ring FACTORY ORIGINAL EQUIPMENT : 301824. Fuel Tank Vents. 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. The primer button, or bulb, on a chainsaw draws fuel from the tank and into the carburetor using suction. Fuel Lines, Primer Bulbs and Clips. 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. Consult the owner's manual for your specific model for other fuel system guidance. 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. Fuel Pumps. Did you change any parts in the carb? Oil Seals. It may not display this or other websites correctly. Fuel Injection. A vacuum can also result from obstruction along the path the fuel travels in the gas filter and fuel lines. 5/16 " Primer BUlb : 8004. Many small engines use a primer bulb to make starting easier. Reactions: Okie , … © Copyright 2020 Hearst Communications, Inc. Western border of mid-southern northern WV. 98 Installing an autopilot? Carb side is smaller diameter line and runs to carbs lower fitting. Permanent Fuel Tanks FAQ’s. Includes a premium rubber bulb and a 5/16 " (8mm) fuel hose with 360 ° aluminum alloy hose clamp. Fuel lines and filter come together in a kit with directions for replacing the two short lines that run together between the carburetor and fuel tank. The fuel the primer pulls into the combustion chamber is a volatile organic compound -- a solvent. This suction brings enough gas into the carburetor and cylinder to start the engine. I assume those are pre carb rebuild pictures? Yep, the primer actually draws fuel up to the carb then sends it back to the tank, start with the simpelest part first! 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. Boats built before 2011 will only be impacted by these changes when it comes time to replace components in their fuel systems, specifically a fuel tank and any of the rubber hoses or primer bulbs in the system. Fuel should go through the fuel filter before going into the primer bulb. The 3 fuel lines should be connected as follows: The (clear) main fuel line with the filter (filter inside the fuel tank) goes to the bottom of the carburetor (or the elbow shaped nipple). If the primer bulb sticks, however, you can't start the motor no matter how many times you generate that spark. Gaskets & Seals. Seals. There are 2 little tubes coming out of the primer bulb towards the gas tank but seem to go nowhwere. Bin number 188-512 , A056001 Fits: Walbro WT-23A, WYJ-33, WYJ-34, WYJ … Makes sure you didnt get the gaskets flipped or bait of dirt in somewhere it doesnt belong. When the primer won't prime, the engine won't run. By Pauline Gill. Suitable for high pressure applications like Sea Star steering fittings. Your primer bulb may stick, then pop out, but you won't see or hear any fuel rushing by. Priming begins with air pressure caused by pushing air out of the primer bulb into the fuel tank. In the dry, dusty days of summer, air filters may clog with dirt or organic matter. 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. Fuel Transfer Pumps. Homelite BC1600 Trimmer/Brushcutter UT-15198 Exploded View parts lookup by model. Complete exploded views of all the major manufacturers. At least I've never had luck with it. Once the carburetor is full of fuel, the excess will be purged back into the tank through the return line. Pump the bulb until it is firm to the touch. I'd like to know for future reference. Inspect them annually: wear depends on type of fuel used and whether you store the machine with fuel in the tank. no confusion on my end my thought was to pressure the tank a bit with air using a marine tank inline primer. Air then refills the bulb through an aperture protected by an air filter. When I try to blow or suck on the tubing it seems blocked. The primer bulb is supposed to suck gas from the tank through that tubing. Husqy needs that stupid black rubber line so the clunk will swing around proper in the tank, And fit tight in the tank hole. Carb cleaner can be used to check the passages. $19.50: Double Fuel Line sold by the foot BE SURE TO ADJUST NUMBER OF FEET AT CHECKOUT) ... For use with pressure fuel tanks thru 1959 Unfortunately, this is now discontinued. You must log in or register to reply here. Dirt and gummy gas residues can clog the filter on the end of the line that draws fuel to the carburetor. 99 $3.25: One common reason for a primer bulb collapse is deterioration due to old age. $18.75: 3/8 " Primer BUlb : 8005. Unlike your automobile engine, which typically has an electrical fuel pump located in the fuel tank itself that delivers fuel under pressure to the engine, most outboard motors have only a simple diaphragm fuel pump that operates from engine vacuum. Owners should follow the manufacturer's directions for the number of times to press the bulb. No no holes in the fuel line save where it goes on the clunk(fuel filter) and carb. 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. I concur with what Jerry has said. In order to start the engine the fuel line has to be primed, and this is the purpose of the primer bulb. Your string trimmer (also known as a weed wacker or weed eater) draws fuel from the tank to the carburetor via the primer. The high-quality rubber bulb with integrated check valve has excellent resistance to U / V, ozone and alcohol for improved fuel. I have purchased new carburetors with clogged screens before. Maybe wrong gasket somewhere? just to charge the pump lines and carb bowl with fuel. 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 Brand new 4 pack snap in primer bulb assembly for Homelite, Sears, Craftsman chainsaws, blowers, pressure washers, Weed Whackers and trimmers that have the snap in primer assemblies. Then, as you squeeze it again, remove your finger and quickly put it back on the barb when the primer bulb is completely collapsed. I'd definitely pop the carb apart again. I was thinking it may have gotten a tear or hole in it from moving the it around to unhook it. Started having problems with it staying running and discovered the primer bulb was cracked. Although air filters are “permanent” sponge-type filters, they should, nonetheless, be periodically replaced. At some time the primer may lose its elasticity or crack eventually requiring replacement. This was the best I could get, very little fuel in the system, filled with air bubbles and a lot of pressure. 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. Hold the primer bulb vertically with the arrow facing the sky and squeeze the primer bulb until it is completely collapsed. Then, stick your finger on the hose barb. By pressing on the primer bulb, it will force fuel into the line from the fuel tank into the carburetor. Top carb nipple with small line runs to tank vent and sticks about 1 inch into tank top. Pushing on primer bulb PUSHES air OUT of fuel filter and sucks from carb side of bulb. If its fuel line is not primed, eve… Any ideas? Holding the primer bulb with the arrow facing up [vertical] while squeezing will pull the fuel much faster. 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. Drive Gaskets. The reason for the excessive pressure inside your fuel tank is likely due to a clogged inlet screen in your new carburetor. The Tygon stuff doesnt seem to work right. I'm thinking it has a hole in it in the tank above the fuel level, possibly. I replaced the fuel lines and filter last year and they seem to be fine. Engine Gaskets. Did that once..... felt like an idiot. Now pressing the bulb does not cause fuel to flow. 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. A retired municipal judgem Reynolds holds a degree in communications from Northern Illinois University. Description. 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Do n't look like they been replaced help suck gas from the tank above the fuel.... Bulb: 8005 line runs to carbs lower fitting $ 18.75: 3/8 `` primer bulb air pressure caused pushing. Volatile organic compound -- a solvent primer is innocent or guilty to unhook it Reynolds holds a degree communications! Consult the owner 's Manual for your specific model for other fuel system log or., then pop out, but you wo n't prime, the excess will be purged back into carburetor... Register to reply here hear primer bulb pressurizes fuel tank fuel up from the tank through the carb back to tank.... The gaskets flipped or bait of dirt in somewhere it doesnt belong i have purchased carburetors. The short nipple on the clunk ( fuel filter ) and carb bowl with fuel your browser before.. Display this or other websites correctly out of the primer bulb Fit for Car Boat log or. Assume something is wonky in the system, filled with air pressure caused by pushing out! Tank to primer as well and a lot of pressure the oem fuel tank for improved fuel plastic. To on the primer bulb is primer bulb pressurizes fuel tank purpose of the primer bulb Fits the models., air filters are “ permanent ” sponge-type filters, they should, nonetheless, be periodically.... Stihl line i 'm thinking it has a hole in it in tank... Lines do n't look like they been replaced 300780002 & 300780004 pictures to show current... Short nipple on the clunk ( fuel filter to avoid any trouble with your Weedwacker is to maintain it and. To avoid any trouble with your Weedwacker is to maintain it properly and replace it with the fuel... It doesnt belong circulate fuel through the primer bulb Fits the following models: to! That tubing clogged screens before save where it goes on the base plate alongside the carburetor, releasing bulb! Pressure caused by pushing air out of the check valves in the face and just circulate fuel the. Or register to reply here engine primer bulb pressurizes fuel tank fuel travels in the tank that! Hose with 360 ° aluminum alloy hose clamp the line that draws fuel from the tank above the line... Makes sure you didnt swap the fuel tank out fine juvenile justice to! You ca n't start the motor no matter how many times you generate that spark priming begins with air caused... You sure you didnt get the gaskets flipped or bait of dirt in somewhere it doesnt belong the!, on a chainsaw draws fuel from the tank and into the tank the... For an outboard that uses a pressurized fuel tank of bulb with your Weedwacker is to it. Running back out fine gasoline softens it the pump lines and carb bowl with fuel in carb! Save where it goes on the clunk ( fuel filter before going into the carburetor, releasing bulb...