t the fuel Primer/Bulb does not fill. There seems to be be an air bubble that does not want to feed through. Where the fuel lines goes into the holes in the tank, does the intake and overflow fuel lines both be submerged under the fuel level, or is there a possibility that there are an air leak somewhere?

Experienced gardeners share their insights in answering this question :
No, the overflow line does not need to be submerged. first make sure that the hose connections are tight and the “O” ring or gasket inside the gas cap is not damaged or missing. when replacing both lines at once, its easy to get them mixed up, so make sure they’re not. remove the carbuerator and inspect the gasket; it should be soft and flexible, if its hard or brittle it needs replaced. it doesn’t take much to clog it, so spray carb cleaner, available at local auto parts store, inside the fuel rails and blow out with compressed air. there might also be a pin hole or bad seal in the primer bulb and need to be replaced.

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Remove the air filter and spray carburetor cleaner into the intake. Let it sit for several minutes to help loosen and dissolve varnish. Replace the filter and try starting the trimmer. If this doesn`t solve the problem, consider disassembling the carburetor to give it a more thorough cleaning.
Checking the Fuel Mix

The most common problem with a strimmer not starting is that there`s a problem with the fuel mix. Double check that you`ve used 40 parts fresh unleaded petrol to 1 part 2-stroke oil (40:1). Check the petrol you`ve used isn`t stale.

If petrol is coming out of your primer bulb, this means that it is backing up in your carburettor and flowing out of the primer tube. The float-valve in your carburettor has most likely got stuck and just needs to be adjusted.
When the outboard is sucking fuel out of the tank, it creates a vacuum. Sounds like something was blocking air from entering the vacuum that`s created. Maybe the rough waves got water and debris into your fuel tank vent and the vacuum sucked all of the air out collapsing the bulb.
ANSWER: The primer bulb, which is located in the fuel line between the gas tank and the engine, is used to fill the carburetor with fuel when the engine is started cold.
If the annealing time is too short, primers do not have enough time to bind to the template. Use an annealing time of at least 30 sec. If the annealing temperature is too high, primers are unable to bind to the template. The rule of thumb is to use an annealing temperature that is 5°C lower than the Tm of the primer.
Too much oil will bog down the engine and the governor will send more fuel and air in to compensate, generating more heat than the engine can dispose of when under-revving. Drain some out.
Primer bulbs do not work well if there is lots of air and no fuel. I spent over one hour getting my new boat primed. You might try running the hose and bulb to a can of gas (lots of things can go bad with can of gas, be careful) and see if the motor will fill and firm up the bulb.
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. The return line (blue) comes from the long post on the back of the primer bulb and goes into the bottom of the fuel tank.
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. The return line (blue) comes from the long post on the back of the primer bulb and goes into the bottom of the fuel tank.

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Which fuel line “port/inlet” on the Walbro wt-380 goes to the fuel tank? It’s on a Craftsman 25cc Gas “Weed Wacker” Line Trimmer purchased in 2002. It has Walbro WT-380 carburetor with external primer bulb. The carb has two inlets for attaching fuel lines – one to gas tank, one to primer bulb. One inlet is on diaphragm side of carb (side with the two Low/High speed adjustment screws). Other inlet is on “reservoir?” side (side with air/fuel mixture screw). Which inlet gets the “fuel tank line”? (Other will obviously go to primer bulb. I found all kinds of diagrams on web but none that showed this. Your assistance is greatly appreciated. (Problem occurs when replacing gas lines and forget which line goes where:)
ANSWER : Usually the line with the filter on it that comes from the tank goes to carb. inlet first which is most likely close to the bottom side of the carb.nearest to the engine,then the outlet or return line on the carb.goes to the inlet side of the primer and the outlet side of the primer goes back to the tank. The primer draws fuel through the carb to the primer to the tank if its not? then correct the line connections until it does

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I have a husqvarna 323L string trimmer. I stored it after running the tank & carb dry for about two years. I fueled it, then started it, & it ran for a minute then died like I turned the switch off. Since it would not restart, I found the fuel filter had broken off the hardened fuel line & it sucked gummy crap out of the tank & into the carb. Failing at cleaning the carb, I finally put a new carb on it & replaced the pump, hoses & filter. It has ran good till this year. I winterized it with stabilizer & left it with a full tank over the winter. The gas in the tank was gone when I got ready to use it this year. I filled the tank with premix, checked for leaks, then started it. It would run fine for about half a tank, start idling poorly (lean) then cutoff & refuse to restart till I refilled the tank. I finally found the tank had cracks & was letting pressure out of the tank & apparently this was causing the carb to lose it’s ability to siphon gas out of the tank. So I replaced the tank which came with new hoses & a filter, which I properly installed to the carb. It cranked right up, but when it runs a half tank, the carb quits sucking gas out of the tank. When I pump to prime the carb, it moves the fuel into the carb, but the pump never gets hard like it does when I prime the carb when the motor is cold. I have to keep refilling the tank, prime, & then it starts & runs until the tank gets about half empty. The new fuel filter is down in the gas tank properly, but It will not run after it shuts off until I refill the tank & prime. I’m baffled. New tank, new hoses, new filter, new carb, & I can find no leaks in the fuel system. It runs strong. The 323L is a two-stroke & it always cranks on the second pull from cold on a full tank. Any ideas?

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Have a craftsman 16″ chain saw 358.360260. Could not initially get it started after it had sat for a couple years with fuel stabilizer in it. When I went to use it the fuel had all evaporated and the fuel pick line was rotted. I replaced that with some difficulty but finally got it on. Saw still wouldn’t start. Replaced the fuel filter. Still wouldn’t start. Pulled the carb apart and cleaned and recleaned everything. Diaphragms were good and I didn’t adjust any of the mixture screws because as I said it ran fine before storage. Non of the carb passages were clogged. Fresh gas 40:1, good spark plug and good spark. Airfilter is good. Engine has maybe about 4 hours of total run time on it. It’s a ZAMA (?) carb. It will run for about 30 seconds when I manually prime it by pouring a small amount of fuel directly though the carb. When I was disassembling the carb the vent hose that goes back into the fuel tank seemed to have a small out of ?substance? in it which I cleaned out. It was right at the end the of the hose that goes back into the fuel tank and not up by the carb. It didn’t appear to be like your typical gummy deposits/varnish though. I hope it wasn?t some type of spongy check valve stuff that is supposed to be in there. That might explain some of my problems. Anyway, I also can not seem to get the primer bulb to fill. When I open the fuel tank, look in side and depress the primer bulb, air bubbles come out of the fuel filter. But when I let the bulb reexpand there’s no fuel that gets sucked up the hose. I can however seem to fill the primer bulb when the fuel tank is full and the chainsaw is laying on it?s pull cord side and the bulb is depressed a bunch of times. The saw will also start and run again for about 15 seconds then die. It’s definitely not getting/fuel and probably running out . Thanks.

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The primer bulb has quite an air bubble in it so I am wondering does this mean that it leaks?
ANSWER : No. If you pump it and it draws gas, you are fine

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Is there a secret to replacing gas lines on a trimmer? my new lines seem too big and don’t want to fit into the hole
ANSWER : Yes, the lines should be larger than the hole or they will leak. The last thing you should do is drill the hole bigger!
First cut the end of the new line on an angle and push it throught he hole as far as you can. Then with a long set of hemostats reach in through the fill hole and grab the line and pull it up through the fill hole. Cut the line straight then and attatch the fuel filter and push it back into the tank. Next, pull the excess line back out of the tank until the filter lays nice and flat on the bottom of the tank and you are ready to cut your new line to length and attatch to the carb or primer bulb.
Hint: always purchase more fuel line than you think you will need. That will give you excess to play with when cutting your angles and pulling it up through the fill hole.

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The primer ball will not fill with fuel. – Echo Zama Carb Kit For Shc210 For Rbk66b Rbk70 Carb
ANSWER : Sounds like you either have a hole in the fuel line or the primer bulb valve is leaking and drawing up air instead of drawing the fuel out the tank

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Which gas line goes to which connecter on the carb? I disassembled to clean and it’s having pressure issues. The tank is filling with pressure and the bulb won’t retain enough gas to keep the
ANSWER : The thing to remember is that the primer pulls fuel from the carb into the bulb and dumps back to the tank, it does not push fuel into the carb, connect the fuel line from the tank to the carb connection nearest to the alluminium pump cover held with a single screw, the other one goes to the shorter of the two connections on the back of the primer.

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How to replace the fuel primer bulb and fuel lines in McCulloch 3516 chainsaw?

the fuel primer bulb broke and the plastic lines have crumbled. i need to know how to run the lines from the fuel tank to primer bulb to carurator.


ANSWER : I just did a primer bulb not too long ago, but I don’t remember what equipment it was on. They are generally easy to replace. First, remove anything that is retaining the bulb assembly, such as cover plate. On my Homelite chainsaw, I simply pried it out with a small screwdriver.
The replacement part itself has two barbed stubs that the two fuel line hoses push onto.
Make sure that you keep the fuel line tubes above the fuel level at all times to prevent leakage.

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