Question about Poulan Pro 16-Inch 38 cc Anti-Vibration Chainsaw #PP3516AVX

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Need to change the fuel lines

I have two lines that come i nto the gas tank. Does only one go back to the carb and the other is a breather line

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One line in the gas tank usually goes to the filter which is just laying inside the tank. and then out to the carb.

Posted on Apr 24, 2010

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The fact that no fuel gets through or it's intermittent tends to suggest a problem with the fuel line itself. Is it rubber? It may have collapsed /perished internally.

You may have a blockage at the fuel pick up point within the tank itself. I think this is probably the most likely .. something 'drifting' around the bottom of the tank and acting like a shut off valve..

If your tank is developing a vacuum it will cause problems. There should be a vent from the tank to atmosphere - either a thin breather tube or a flap in the fuel cap. If the breather becomes blocked a vacuum is caused in the tank - it 'holds up' the fuel.

If you can hear air rushing into the tank when you remove the gas cap - you have a vacuum. try removing the cap to see if it makes any difference

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U will have one line of the gas tank this fuel line into the top port on the clutch side of the carb the other two a breather throttle top of carb side and a overflow tube. Hope this helpl good luck

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from memory
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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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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

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Troy bilt gas trimmer gas lines broke and now I'm not sure which lines go where.


The gas lines probably broke because of the ethanol-laced gasoline we have to use nowadays. It deteriorates them. If the unit has the external purge/primer bulb, the way mine did, it is not that hard. Just remember...the primer bulb "pulls" fresh fuel from the fuel tank to and thru the carb, thus pushing out any air/old fuel in the metering chamber of the carb back to the fuel tank in the return line...that said..
Fuel tank...2 lines...smaller diameter line goes directly to the carb body. There are probably 2 brass nipples on the carb. This line goes to the one on the body opposite the end of the carb with the vent-hole in the cover. This is the fuel pump end...where fresh gas enters the carb.
The larger line out of the fuel tank connects to the longer nipple on the purge/primer bulb. This is the fuel return line.
The remaining fuel line (larger diameter) goes from the vented-cover (has writing on it) end of the carb to the shorter nipple on the purge/primer bulb. This line carrys air and old fuel OUT of the carb to the bulb where it is then PUSHED back to the fuel tank via the return line...so you have a small diameter supply line to carb...an intermediate larger diameter line from the carb to the bulb and finally the larger diameter return line from the bulb BACK to the fuel tank.
Go to a small engine shop and purchase about a foot each of the 2 different diameter fuel lines needed and install those new "Tygon" fuel lines as your fuel line replacement.

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You may have accidently hooked the lines to the purge button wrong. The purge button (primer button) should have a short stem and a long stem. The short stem is the suction side of the primer button and should be hooked up to the return on the carburetor. You actually s*uck gas through the carb and not from the tank. The carb should have two hook ups. If you hook the fuel line up to one of the lines on the carb and the button is hard to push and doesn't return to normal, hook the line up to the other one. When you push the primer button gas should be pulled through the carb. The other line on the carb goes back to the fuel tank.80a09a6.jpg

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