Weedeater FL1500
Im having a problem with the gas going into the carburetor. When I prime it, the fuel goes into the return line but nothing is happening on the filter line. I have the return line connected to the primer and the other to the carburetor. Any suggestions? Thanks. Fuel will exit carb thru return line when you push the air purge bulb, fuel will be drawn into carb from the line with filter on it in the tank, when you release bulb. Can you see fuel going thru the return line each time you push it ? Have you run the unit lately? Have you replaced the fuel filter lately? Has it sat for a period of time with old fuel in it? Has the carb ever been cleaned/rekitted ? Possibly a check valve in the primer is stuck...... I can see fuel being drawn in from the return line and nothing happening on the filter line. I took the filter off to isolate it and same thing. Im guessing a check valve is stuck but I dont really know where the check valves are. I dont do this on a regular basis so any help is appreciated. Im just helping a neighbor out. His original problem was the fuel filter line broke off into the tank so I offered to replace the lines for him since I had to do the same on mine. His blower wouldnt work once the level of fuel reached a certain point but it was running nicely prior to me installing the new lines. My FL1500 has two lines on the carb, of course, the one closest to the air purge bulb is the return line, it only sticks down in the tank about 1/2 inch. This is a 3/16 OD and 3/32 ID. The line lower on the carb will be a smaller line going into the tank with the filter on it. You gottum hooked up this way ? Yes I do. I forgot to mention that when I replaced lines the blower would only start up on full choke and would only stay on during full choke, (Idling I guess) when I put it to half choke it would turn off immediately like it was starving for either gas or air. The air filter is not clogged so Im assuming its gas. The bulb has been doing this thing also where it would stay stuck down when Im trying to prime it. When I first replaced the lines, the return line was working correctly, fuel was going back into the tank but didnt see much going into the carb. Ok I tried it again, when I press the bulb down the fuel returns to the tank. When I let the bulb go it sucks the fuel back up into the bulb while nothing is going on with the carb fuel line. If you are pushing fuel into the tank on the return line with each pump of the primer, then, fuel has to be drawing from someplace... It could be that there are no air bubbles in the line to the carb (which is the purpose of the primer) and not able to see the fuel moving...? Have you tried reversing the lines on the carb? I disconnected and emptied both lines for that reason to see if it was just that I couldnt see it. When I primed it again fuel is being sucked in to the carb but very slowly not enough to keep it running. On the return line side - the fuel gets sucked up from the tank and basically goes back and forth from the bulb and back to the tank. So theres nothing really returning from the carb, its just the fuel that came from the tank. Sorry if I dont make any sence. Just taking a guess I think theres some type of blockage between the two lines but in the carb. Im not getting anything to return back to the tank and the inlet line doesnt seem to allow enough fuel into the carb. I just dont see how it can remain on with so little fuel being supplied to the motor. Thanks again for any ideas or help The fuel line to carb is a small line, it could be that it is full of fuel after 1-2 pushes of the bulb, and you just can't see any fuel movement. The only route for the fuel is from tank, thru carb, out the return, if you can see fuel going out the return line, it has to come from somewhere, i.e. fuel inlet, etc. etc. how old is this unit ? hth Glen, thanks for the reply. I dont know how old the unit is but I heard it running strong Sunday. I understand how the primer is supposed to work but its just not working that way. Think about it this way, theres no fuel coming into the bulb from the carb. Theres some sort of blockage. So when I press the bulb in it pushes air into the tank, now the bulb has to pop back up creating a vacuum that sucks back the fuel into the primer bulb and if I keep pressing the bulb it just keeps pushing the same fuel back and forth from the bulb to the tank. Why do I know this? A couple of you mentioned maybe I cant see it. You guys are right, so what I did was disconnected the two lines emptied them out so that when I primed it again I would see how the fuel flowed. So far I came to the conclusion that there is a blockage. The smaller line barely has any fuel going into it. When I start the blower, it wont go past an idle speed. My guess is that theres not enough fuel due to some kind of blockage in the carb. I dont believe its flowing right. I just dont know if this is a notorious problem that someone came across before to steer me in the right direction. And you're sure the filter is not the problem? btw, any problem I encounter with a cube carb, I categorically disassemble, clean and make sure the metering diaphragm is good and pliable and the float pin is good, as well as fuel lines and filter Oftentimes I only replace the the diaphragm and pin.... thanks, we'll get to the bottom of this...... I isolated it not being the filter I took it off and I primed it again with the same result but it wont hurt to replace it. Fuel lines are brand new. Metering diaphragm and float pin...Is the diaphragm the gasket on the bottom of the carb? Float pin, I have no clue what that is. If you can describe it im sure I can figure it out. This is all new to me...I originally got into the weedeater for a neighbor thinking it was only the fuel lines that needed to be replaced but I dont mind doing it just for the knowledge and to help out. Again, Thanks. On the fuel pump side, the diaphragm should be up against the carb, then the gasket. On the metering valve side, the gasket should be against the carb, then the diaphragm. It sounds like the carb is restricted or assembled wrong. Is the screen clean? Chuck, that was one conclusion I'd come to, screen full of crud, why I suggest a clean/re-kit. My 1500 has a ZAMA C1U-W12 carb, kit RB-47. Check to see which carb manufacturer it is If Walbro, the following two sites will get you about all there is to know Service Manuals Select a Manufacturer*[Frontstep Customer Center*5*Frontstep, Inc.] The following site if ZAMA: USA Zama : Service Tips Glen I have the same carb you have. Thanks for the link its going to help out alot. Cheese I looked at the gaskets and theyre exactly in the order you mentioned. The screen is a bit dirty so im going to clean it out with some carb cleaner. Thanks I cleaned the screen from the inside by taking off the inlet needle valve and spraying with carb cleaner. I didnt realize how dirty it was till it was cleaned. I also ran carb cleaner through every orifice in the carb. Now the primer is working properly but the blower will only stay on at half throttle for about 30 seconds then itll die out. Any ideas on this? Thanks again. Still sounds like it has some crud somewhere in the carb in one of the passages. Do you have access to a high pressure air source to blow out the passages with? Can you adjust the mixture screws on this carb? I do have an air compressor. Ill check and see if I can adjust the mixture screws and ill blow out all the passages. I was doing a little research yesterday while the website was doing maintenance. I dont know what a check valve really looks like on one of these but I do remember seeing a tiny round flat rubber piece that came out one of the passages under the bulb. Dont know what its for but since it came out of there, I kept it.
You're going to have to get another carb. That rubber piece is the check valve and if it's not in place, the carb won't work. That's the one hole in the carb you don't want to poke through, lol. Carbs are cheap, or the mower shop mi9ght give you one off a junk machine...they probably have piles of them. I just got super lucky cause I put the check valve back in place, (miracle) messed with the primer for a good 10 minutes or so cause it stopped working again. Fired it up, it would only idle. Then I remembered you told me to clean it cause it sounded like I still had some crud in it, so I did. I put it back together and then the primer started working just fine. So I thought why not just try and fire it up. I did and it seems to be working fine. Thanks Cheese and Glen for all your help. Great! Glad we could help and thanks for the update! It was largely due to your perseverance...!
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