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Two tubes btween carb and gas tank. one is fuel filter, other is primer. i am replacing the lines, the primer tube has a connector attached to it, inside the tank. just a union type fitting but i cannot see where anything attaches to it? am replaceing the lines because of air in the primer bulb when starting.(very hard to start but once running is OK). ? = does the primer pickup tube just dangle in the tank or is a weight or filter attached to it/ thanks for the help MM

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There is a filter attached in the tank

Posted on Apr 08, 2011

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The primer (actually a purge bulb) has 2 lines (if externally mounted).. The one going from it directly to the fuel tank is the return line and has a small nylon connector on the end of it to hold it in place in the tank. Old fuel and air are returned to the tank through this line. The other line on the bulb is the one for drawing the old fuel/air OUT of the carburetor and to itself, where it then pushes it on to the fuel tank through the line previously mentioned. Another line out of the fuel tank is the filtered fuel line and goes directly to the carburetor. What follows describes the usual setup with primer bulb ON carburetor fuel line routing information also.
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

Posted on Apr 08, 2011

  • Sam Doss Aug 07, 2013

    thanks for the info, had my lines on wrong. working fine now

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Which fuel line is the intake line at the carburetor?


The fuel line goes:
  1. From the filter in the tank to the carb, usually the bottom most connector.
  2. From the carb to the Primer. The tube in the center of the primer bulb.
  3. From the primer, outer tube to the fuel tank.
Get the manual online from Troy-bilt herehttp://www.troybilt.com/equipment/troybilt/tb146-ec-4-cycle-garden-cultivator

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Walbro WT891 carb on a Craftsman chainsaw. Carb is brand new, all fuel lines and fule filter replaced. I prime the carb with the little plunger, chainsaw starts up and runs out of fuel within 30 seconds....


Who connected these hoses? the normal routing for a machine with a primer is like this, the fuel hose from the tank with the filter on the end goes to the carb fuel inlet nozzel ( not to the primer ) nearest to the pump cover ( cover on carb held with one screw ) the pipe from the metering side of the carb connects to the shorter nozzel on the primer bulb ( suction side ), the longer nozzel on the primer ( pressure side ) connects to the pipe going back to the tank, just remember the primer pulls fuel from the carb,into the bulb, and pushes it back into the tank, it is not actually a primer it is a purge. because it is connected this way it is impossible to flood the engine no matter how many times the bulb is pressed.
Let me know if it starts and runs.

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1 Answer

Poulan/Weedeater BV1650 gas trimmer: Will not start/run without pouring gas into carb. Took filter/pickup out of tank. Seems to blow through okay but plan to replace. Pulled both fuel lines (one for...


The filter sounds like the weighted type. If so, it keeps the pickup line on the bottom. The piece that keeps the tube in the tank can just be a piece of a little larger tube pressed over the pickup tube. Yoi will have to thread new tubing in and pull it out the fill hole. Place the keeper on the tube and press the filter into the pickup tube. Once you are ready, pull the pickup tube inti the tank until the keeper touches the tank side. Hook up to the primer and try it. Good luck...Lee

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McCulloch 3216 fuel primer and gas tubes routing?


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Fuel Line Replacement by SmallEng.com
http://www.youtube.com/watch?v=JrXpU70Hmi0
  • The hose in the tank with the filter on the free end connects directly to the carburetor input connection.
  • If the saw is equipped with a primer bulb, the output line from the carburetor connects to the suction side of the primer (once the bulb is collapsed it draws fuel from the tank through the carburetor to refill the bulb as it inflates).
  • The pressure side of the primer returns displaced fuel to the tank as it is depressed.
Take lots of notes and a few digital photographs will help with reassembly. HTH
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1 Answer

I am replacing the fuel tank assy and purge bulb (i.e. primer) on my Sears Craftsman model 358.798940. The original plastic tubing was old and brittle and broke apart while disassembling, so I could not...


The order of fuel travel should be:
Fuel filter to fuel hose to Carb's Fuel Supply nipple. (On the main body of the carb)
Primer Plate Nipple on carb to fuel hose to Suction Nipple on Primer Bulb. (It must pull fuel thru the carb, not push)
Pressure Nipple on Primer Bulb to fuel hose to Fuel Tank Return hose.

When correctly installed, the fuel will be PRESSED into the fuel tank via the return hose when primer is pressed in . . . and SUCTIONED out of the tank and into the Carburetor when primer in released.

Hope this helps,
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6 Answers

Replace fuel lines WeedEater FL 1500 Blower


On the FL1500:
  • The Smaller line goes on the Lower inlet tube on the carborater the other end goes to the gas filter inside the gas tank.
  • The Larger line goes on the upper outlet tube on the carborater the other end goes to a fitting that holds this tube from coming out on the gas tank .This tube is only for Air, it helps fill the primer bulb when pushed.
I hope this helps.
Mechs correct me if I have made a mistake.
Thaxs Jon

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1 Answer

LOOKING FOR INFORMATION ON FUEL LINE ROUTING CONNECTIONS. FROM FILTER TO PRIMER BULB, TO CARB CONNECTIONS AND THEN TO RETURN BACK TO FUEL TANK.


most trimmer fuel lines run from line in tank with pick up filter to bottom of carby then out of top of carby to inlet on primer usually the smaller tube then out of the longer tube on the primer and back to the tank.

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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.

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I have a Ryobi Lawn Hornet MK2 which belongs to my brother and I offered to try and fix it. Two of three fuel tubes broke and he is uncertain where they go (as am I). There is a primer pump with two tubes...


IVe worked out that the tube from the filtered tube ( the lowest part of the tank) goes to the bottom entryof the carb and the other goes to the primer bulb. the other side of the primer bulb goes to the top entry of the carb.So the barb has two entry points,the top being to prime for start and the bottom for ordinary running.I found this works for me.

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