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Primer bulb hook up

Cannot figure out the hose configuration from primer bulb to carb, to gas tank

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Two lines come from the tank--one with a filter that goes to the carburetor, another with no filter which goes to the output side of the primer bulb and passes pumped fuel back to the tank. Connect only the line with the filter on the end to the primer and pump it. If nothing happens, switch the line to the other port on the bulb and pump again. With fuel mix in the tank, one of these two ports should pull fuel into the bulb. When correct, put the filter-less line on the other port of the bulb. Remove the filtered line from the bulb and hook it to the upper fuel connection on the carburetor. Use another length of fuel line to connect the now open port of the bulb to the other port on the carburetor. If the connections on the carburetor are correct, fuel will fill the bulb after a few pumps. If nothing happens, reverse the two connections at the carburetor and try to pump again. You should see fuel enter the bulb with only the correct connections at the carburetor. Usually, these connections are unidentified and must be found by trial and error. This is also a good reason for replacing only one line at a time! When fuel pumps into the bulb, attempt to start--with luck, the engine will run. Once the engine runs normally, trim the line lengths so that you have no excess line, but don't have sharp bends in any line either--they will eventually kink! Hope this helps!

Posted on May 05, 2010

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How do you hook-up new fuel lines on MacCat 2.3 38cc. Primer bulb 2 places, carb 2 places, tank 2 places Old lines deteriorated where do hoses hook-up


OK, there are two conections on the back of the primer, the longer conection is the pressure side, so this has a hose back to the fuel tank, it will just push into the tank with nothing on the end, the shorter connection on the primer is the suction side, this pipe will go to the carb, the conection nearest to the metering cover of the carb, usually a chrome cover held with four screws, the other connection on the carb, nearest to the pump cover, usually alluminium held with a single screw, goes to the fuel tank with the fuel filter on the end, just remember the primer pulls fuel from the carb, into the bulb and back into the tank.

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1 Answer

I changed the primer bulb and now it's not getting


sounds like you hooked the lines up backwards, when you press the primer it is supposed to squirt gas into the tank on the return line cause what it does is draw fuel through the carb and back to the tank....filter line from tank goes to fuel pump side of carb and return line on carb goes to primer bulb then opposite line on bulb to tank...... so when you press bulb it draws fuel through filter in tank through carb and back to tank ! good luck! 2StrokeJim

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I HAVE A2150 POULAN CHAINSAW THAT THE HOSES ON THE CARB HAVE BROKEN OFF FROM THE PRIMER BULB I SEE WHERE THE SMALL ONE GOES BUT CANNOT FIGURE OUT WHERE THE OTHER ONE HOOKS UP I ONLY SEE ONE SPOT FOR A...


Your primer bulb must have 2 lines coming off.One goes to the tank and one to the carb.If it doesen;t it must have broken off.if so it needs to be replaced the bulb will say tank and carb on the back of it.In very small letters.

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1 Answer

Replaced gas tank and primer bulb on my Poulan Leafblower FL1500 and it appears I'm not getting gas into the carb. Any ideas as to what my be the cause?


I assume the new tank came with new fuel lines and filter in it.
First be sure you have all the lines hooked up correctly. There should be a main line from the tank ( has the fuel line on the end of it in the tank) to the fuel pump side of the carb. Then there should be a line leaving the metering side of the carb to the primer bulb then from the primer bulb returning to the tank. When you press the primer bulb you should see it **** the fuel into the carb then from the carb into the primer bulb then back into the tank.
If the fuel lines are all hooked up correctly then you should rebuild the carb.

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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,
Dolf-

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2 Answers

McCulloch Chainsaw carb not getting fuel


This is the same problem I have with a Mac 3200. I have: (1) A line from the primer bulb to the front port on the carburator. (2) line from fuel tank, with attached fuel filter, to the other primer bulb port. (3) Line from port on back of carb. to ????. I thought it must be a pulse line, but not certain, and don't know where to run it to. Please let me know when you find out.

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2 Answers

Fuel hose routing problem on a Mac 3200 Chainsaw


This post helped me with my McCulloch Mac 3216 chainsaw. There are two holes in the gas tank - one above the other. One is for the gas line (with the filter on the end) and the other is for the overflow - a simply line that runs from the "out" nipple on the primer bulb into the gas tank. The filtered fuel line goes to the nipple on the back of the carb. Another short line goes from the "in" nipple on the primer bulb to the nipple on the front of the carb.

There are two notches just out from the two holes in the gas tank for holding the lines that go in -- this may help you locate the holes.

I found it helpful to pull the lines that go into the gas tank out through the gas cap hole and leave them hanging out until the housing was reassembled. I also left the lines that plug into the primer bulb hanging out through the hole where the bulb goes until the housing was put back on. Leave plenty of extra line for the lines going out to the primer bulb. Once the housing is in place, cut the lines to the primer bulb and attach them, and slip the lines into the tank, making sure the ends are as far down in the tank as possible. You will need this extra "slack" to work with the housing to get it back on.

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2 Answers

Ryobi 790r i have changed the gas line and the primer bulb . the primer will mash in 1 good time and then gets very hard to mash in . i fully choke it and it will crank but only for 3 seconds until it...


You cannot flood the engine by pushing the primer bulb too much, unless the hoses are hooked up backwards. The primer does not push gas to the carb, it sucks gas through the carb and returns it to the tank. Top barb on primer is the hose coming from the return side of the carb and the bottom fitting is the hose going to the return fitting on the tank. Look inside tank, it is the one without the filter on it, just a flange with a hole in the center.

If you can see gas and air bubbles moving through the primer and into the tank the hoses are on correctly. If you see bubbles going in the correct direction and then reversing when you remove your finger from the bulb, then the check valves in the primer may be bad. Replace primer.

When you say the primer "gets hard to mash", do you mean it is hard to push in or is it very slow to refill and return to the home position? If it is hard to push in and the bulb is full of gas and the hoses are on correctly then there must be a plug in the line going to the tank or the vent in the gas cap is not working. If it does not return, then it is most likely a plugged filter, plugged line from the tank to the carb, plugged screen inside the carb or a stuck needle valve. The primer is creating a slight vacuum to pull the gas through the carb, which is what the carb does when the engine is running. If there is a full or partial restiction on the supply circuit neither the primer nor the carb can pull enough gas for the engine to run. May need to disassemble carb and clean out any varnish, gunk or plugged ports/jets. Use spray carb cleaner. May want to think about a diaphagm and gasket kit if you do it yourself. If you do not feel confident in taking apart the carb, then take to a repair shop.

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2 Answers

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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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