Fuel Transfer Pumps. Just a dumb question but are you sure you didnt swap the fuel lines on the back of the primer? I have a Homelite weed trimmer model ST-155. This was the best I could get, very little fuel in the system, filled with air bubbles and a lot of pressure. Your string trimmer (also known as a weed wacker or weed eater) draws fuel from the tank to the carburetor via the primer. One common reason for a primer bulb collapse is deterioration due to old age. I was thinking it may have gotten a tear or hole in it from moving the it around to unhook it. Fuel Injection. You replace the primer bulb?lines don't look like they been replaced. 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. Package Inlcude: 4X Primer Bulb Fits the following models: Refer to part numbers 01183, UP04033, 300780001, 300780002 & 300780004. Tank side is for larger line and runs into tank and fuel filter. At some time the primer may lose its elasticity or crack eventually requiring replacement. A retired municipal judgem Reynolds holds a degree in communications from Northern Illinois University. One durable plastic item is included per order. 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 just to charge the pump lines and carb bowl with fuel. 5/16 " Primer BUlb : 8004. 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. Also have huge pressure in the tank too. I replaced the fuel lines and filter last year and they seem to be fine. Many small engines use a primer bulb to make starting easier. The reason for the excessive pressure inside your fuel tank is likely due to a clogged inlet screen in your new carburetor. 99 Reactions: Okie , … then remove the extended run cap and replace it with the oem fuel tank cap. I have purchased new carburetors with clogged screens before. Description. no confusion on my end my thought was to pressure the tank a bit with air using a marine tank inline primer. You must log in or register to reply here. Fuel Lines, Primer Bulbs and Clips. Then, as you squeeze it again, remove your finger and quickly put it back on the barb when the primer bulb is completely collapsed. An avid perennial gardener and old house owner, Laura Reynolds has had careers in teaching and juvenile justice. Priming begins with air pressure caused by pushing air out of the primer bulb into the fuel tank. I assume those are pre carb rebuild pictures? At least I've never had luck with it. Actually, there's been a gradual phase-in of low-permeability hose since 2009. Hose and Tank Fittings. The Tygon stuff doesnt seem to work right. I'd definitely pop the carb apart again. Started having problems with it staying running and discovered the primer bulb was cracked. I replaced it and the new one won't pump any fuel up from the tank. $3.25: 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. Consult the owner's manual for your specific model for other fuel system guidance. Fuel Tank Senders. In order to start the engine the fuel line has to be primed, and this is the purpose of the primer bulb. Engine Gaskets. Did that once..... felt like an idiot. 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. Maybe wrong gasket somewhere? © Copyright 2020 Hearst Communications, Inc. When the primer won't prime, the engine won't run. Primer bulbs attach with two screws on the base plate alongside the carburetor and may last for years. The tank has no cracks, only the tube holes and the tubes appear to seal those to prevent air escape. Then, stick your finger on the hose barb. Depending on how often the little machine starts and its age, the inside of the bulb will eventually get gooey, causing it to stick. By pressing on the primer bulb, it will force fuel into the line from the fuel tank into the carburetor. 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. Repeated use and extreme summer heat stress the plastic bulb as the gasoline softens it. Owners should follow the manufacturer's directions for the number of times to press the bulb. A vacuum can also result from obstruction along the path the fuel travels in the gas filter and fuel lines. 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. 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. 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. 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… Includes a premium rubber bulb and a 5/16 " (8mm) fuel hose with 360 ° aluminum alloy hose clamp. I did just get some stihl line I'm going to try out next time I redo a saw fuel system. 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. I concur with what Jerry has said. Seals. Air then refills the bulb through an aperture protected by an air filter. I'm thinking it has a hole in it in the tank above the fuel level, possibly. Dirt and gummy gas residues can clog the filter on the end of the line that draws fuel to the carburetor. It may not display this or other websites correctly. Universal 8mm Fuel Gas Hose Line Set With Rubber Pump Manual Pressure Primer Bulb Fit For Car Boat. For a better experience, please enable JavaScript in your browser before proceeding. Portable Fuel Tanks, Funnels and Straps. 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. Fuel Tanks. No no holes in the fuel line save where it goes on the clunk(fuel filter) and carb. 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. Check your fuel line from tank to primer as well. $18.75: 3/8 " Primer BUlb : 8005. Her six children and stepchildren served as subjects of editorials during her tenure as a local newspaper editor. Here's some pictures to show the current situation. Primer bulb is marked tank and carb side. 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. Your primer bulb may stick, then pop out, but you won't see or hear any fuel rushing by. When I try to blow or suck on the tubing it seems blocked. Some chainsaws use a primer bulb to help suck gas into a cold carburetor. 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. 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. 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