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I have the same problem

I replaced the pump blub and it sucks on the small line at the carb, and blows into the tank. I thank we are getting the wrong pumps, or bad ones.

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This sounds as if yiu may have the lines reversed on the pump

Posted on Sep 10, 2009

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My lawn mower wont start it is not getting gas and the primer blub has no prime


Ok first of all you need to unplug the plug wire to prevent it from sparking. Make sure you're in a ventilated area. Shut the fuel valve off if it has one. Remove the carburetor and make sure to note how it comes apart so you can put it back together. (Note if you can get to the drain plug skip removing the carb for now) Open up the fuel bowl drain plug and if no fuel comes out its more than likely a clogged fuel line or in the tank itself. Remove it all and use carb cleaner and blow it with compressed air especially the inside of the tank but soak up what fuel is in there after draining with a clean shop paper towel. The thick blue ones. Most small yard equipment doesn't have fuel pumps and are gravity fed and the lines must be clean for the fuel to get to the carb. In you're case to the blub. Reason for all this is bad fuel these days with ethanol. Two ways to prevent this headache. First drain all the fuel every fall/winter or use sta-bil fuel additive in the tank and run it long enough to go thru the lines and carb before turning it off. Works for me. Good luck any let me know how it went.

Apr 28, 2017 | Garden

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How do i know if fuel hoses are connected to right sockets


Knowing the make and model will help. Some saws have a primer bulb that will suck the fuel through the carb to prime it.

If this is the case, here is the sequence: Fuel line from tank goes to the (fuel in) side of the carb. The (fuel out) side of the carb goes to the primer bulb the (suction side) The (blowing side) of the primer goes to the return to tank.


So when the primer is pumped it pulls fuel into the carb to prime it and any over priming gets returned back to the tank.

If you find this useful, please click the 'helpful' tab. Thank you

May 14, 2016 | Garden

2 Answers

I'm trying to get an old weedeater/poulan 22" excalibur hedge trimmer running for my son. In the past someone has cut a fuel line going to primer bulb. I replaced that line and when I use the primer...


There are 2 different set ups for fuel lines on these 2 stroke carburetors. One has a remote primer/purge bulb and the other has the primer/purge bulb on top of the carburetor. Here are instructions on how both kind work and how to service them.

The small diameter line out of fuel tank (has filter in-tank on end) connects directly to the side of the carburetor that has the fuel pump....that is the cover without the hole in it. Other larger diameter fuel line out of tank connects to the longer nipple on the external purge/primer bulb. The bulb "pulls" fresh fuel from the fuel tank to the carb and then out of the carb to itself, where it then "pushes" any air/old fuel back into the fuel tank. The remaining larger diameter fuel line in this setup goes from the metering chamber (has cover with writing on it and a vent-hole) side of the carburetor to the smaller nipple on the purge/primer bulb. Again, on the primer bulb, the longer nipple has a line going directly from it to the tank. This is the return line. The shorter nipple on the bub has a line from it going to the metering chamber side of the carb. If the purge/primer bulb is on top of the carb...small line from carb body to small hole in tank with filter. Larger diameter line goes from the bulb on the fuel pump side of the carb to the larger hole in the fuel tank where sometimes the line is held in place with a nylon nipple connector that keeps the line from pulling out of the tank. Otherwise, the line should enter the tank for about 1/2" or so If you have any more questions, please post back. I will see your comment and be glad to help you,

Apr 23, 2011 | Poulan Ght225 25cc Gas Hedge Trimmer

2 Answers

I have a weedeater 150 mph blower that i need to replace the small and large fuel lines. Do both lines go to the bottom of the tank? does it matter which nipple the large hose goes onto? At the moment the...


Both lines do go to the bottom of the tank. One is the supply line (has in-tank fuel filter on it) and the other is the fuel return line (only needs to be in the tank for 1/2" or 1". It does matter which nipple on the external primer bulb the lines connect to. One sucks in and one pushes out. If you push on it with your finger covering one of the nipples, it is easy to tell if it is sucking or pushing. It will make a little pop, when you remove your finger if it is sucking. Here is the lowdown.
The small diameter line out of fuel tank (has filter in-tank on end) connects directly to the side of the carburetor that has the fuel pump....that is the cover without the hole in it. Other larger diameter fuel line out of tank connects to the longer nipple on the external purge/primer bulb. The bulb "pulls" fresh fuel from the fuel tank to the carb and then out of the carb to itself, where it then "pushes" any air/old fuel back into the fuel tank. The remaining larger diameter fuel line in this setup goes from the metering chamber (has cover with writing on it and a vent-hole) side of the carburetor to the smaller nipple on the purge/primer bulb. Again, on the primer bulb, the longer nipple has a line going directly from it to the tank. This is the return line. The shorter nipple on the bub has a line from it going to the metering chamber side of the carb. If the purge/primer bulb is on top of the carb...small line from carb body to small hole in tank with filter. Larger diameter line goes from the bulb on the fuel pump side of the carb to the larger hole in the fuel tank where sometimes the line is held in place with a nylon nipple connector that keeps the line from pulling out of the tank. Otherwise, the line should enter the tank for 1/2" or so.

Jan 07, 2011 | Craftsman 25cc Gas Line Trimmer

1 Answer

No gas getting from the gas tank to the carb. replaced hoses and filter already. can not even draw gas with primer button.


You either need a new primer bulb (leaking air) or you have the fuel lines routed wrong. Here is the correct fuel line routing just in case:
Small diameter line out of fuel tank (has filter in-tank on end) connects to the side of the carburetor that has the fuel pump....that is the cover without the hole in it. Other larger diameter fuel line out of tank connects to the longer nipple on the external purge/primer bulb. The bulb "pulls" fresh fuel from the fuel tank to the carb and then out of the carb to itself, where it then pushes any air/old fuel back into the fuel tank. The remaining larger diameter fuel line in this setup goes from the metering chamber (has cover with writing on it and a vent-hole) side of the carburetor to the smaller nipple on the purge/primer bulb. Again, on the primer bulb, the longer nipple has a line going directly from it to the tank. The shorter nipple on the bub has a line from it going to the metering chamber side of the carb.If the purge/primer bulb is on top of the carb...small line from carb body to small hole in tank with filter. Larger diameter line goes from the bulb on the fuel pump side of the carb to the larger hole in the fuel tank where the line is held in place with a nylon nipple connector that keeps the line from pulling out of the tank

Oct 04, 2010 | Craftsman Convertible 25cc. Gas Line...

4 Answers

1976 gmc 350 - no fuel getting to carb, I disconected the fuel line from the carb & cranked - nothing came out but I could heaar the pump working and feel some air being blown out - yes there is fuel...


yes it is probably the pump or a problem in one of the fuel lines but i would bet more on the fuel pump or suction line into the tank. If you can take the line off going to the tank put it in a jug of gas and see if the pump will pump it to the carb or the engine will run.

Jul 29, 2009 | GMC Sierra Cars & Trucks

2 Answers

Only stays running on choke, sounds a bit rough, new plugs


Gas these days ****, and standing gas sucks even more. Drain your carbs and flush out your fuel tank. good luck

Jul 06, 2009 | 2002 Honda VT 750 DC Shadow Spirit

2 Answers

Primer bulb on weedeater won't prime


when you prime the bulb it sucks gas from the tank with the small tube, any excess gassed pumped will be fed back to the carb via the big tube leading to the tank. If you prime it and the bulb stays pushed down, then you have a clog or kink. To fix , pull the small tube out of the tank through the fill hole. Pull off the filter on the end and put the tube back in the tank. If it primes, your fuel filter was clogged. If it still wont prime check the hose going to the carb and make sure isnt clogged or kinked.(take of carb and blow in it). If that doesnt fix it take off the bulb from the carb with two screws. The bulb assembly will come off too(rectange metal thing) Take off the two black gaskets, be carefull with them. Take off hoses from carb and bulb asembly. Blow carb cleaner in all holes and over surface. Put back together.
If the carb wont prime and the bulb isnt staying depressed. then you might have a bad bulb or carb gaskets. Make sure hoses are not cracked, cloged, or pinched.

Jun 17, 2009 | Troy Bilt Tb70ss Gas Trimmer

3 Answers

Replacing fuel tank on craftsman edger and other fuel lines.......do not understand where to hook fuel lines back up?  any diagrams?


ok If you have a Walbro WT series carb "without" a built on primer bulb here it is. First off if the fuel lines disintegrated you MUST disassemble it and clean it out. The MOST infintesimle speck of gas line trapped, can allow good prime and bad operation. OK? Don't be lazy on this. Just be delicate removing the flaps gasket and diaphram. ZAMA GND-12 Is the replacement Gasket and diaphram kit fot that carb. Use a cleaner, compressed air or blow good thru it. OK Now...Primer bulb, Carb, and Fuel tank, re connects: Smaller Diameter line comes from Gas tank (Connect filter screen to this in tank) to the short Straight brass carb connector. Primer bulb suction goes to the bent carb brass connector. If small line brings fuel "in" this other line sucks it back "Thru the primer bulb" and the blow side of the primer bulb sends it back to the fuel tank! So...Small Line brings fuel "TO/IN" carb thru short brass connect on carb. Other carb connect goes to bulb suction "IN", Then primer bulb "Pressure OUT" goes thru the larger tube "back to fuel tank". Trust me I know how frustrating a simple diagram is to find online fo this set up. And if you have a carb problem on top of the hook up uncertainty you got frustration. Not only was online help hard to find (Mfg...etc NFG at all!) My local repairshop in BBrook NJ could not tell me how!!! and thats no lie! Walbro has a "generic" carb diagram but no "hook up info" specifically. Poulan don't list it either. And these things routinly fall to pcs. all 3 of mine crumpled together on yr. 3 of use.

Jun 15, 2009 | Poulan 25cc 2-Cycle Gas Powered String...

1 Answer

Fuel pump problem


The vehicle is a 1950? If so it will have a strainer in the tank. You can remove the gas cap, the supply line to the pump and blow compressed air back to the tank. It will blow this strainer off. If you do this then you will need to install an in line filter to catch any trash before the carb. Also sometimes it is hard to get a mechanical pump to pick up fuel after replacement, so it may be necessary to pour a small amount of gas in the carb. Good Luck.

May 29, 2009 | 1991 Buick Roadmaster

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