Question about Poulan 25cc 2-Cycle Gas Powered String Trimmer with Curved Shaft #P1500

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Primer bulb stays down when trying to pump it full of fuel

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Its bad needs new one

Posted on Oct 01, 2009

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Carburetor leaks fuel in the combustion chamber and out through the area of the throttle plate into the air filter.This happened after I had to replace the fuel lines .


This is not as easy as it appears!
The image below is the proper routing for the fuel lines from the tank through the primer and carburetor.

It is so easy to assemble this backwards and pump unfiltered fuel through the carburetor. Or Assemble it so that the primer pushes fuel into the carburetor.

The primer pulls the fuel through the filter located in the tank up the inlet hose into the carburetor internal fuel pump filling up the carburetor and purging out any air. The output of the primer returns any excess fuel back into the tank via the return hose.

26117870-p2kvwqjbo3oi50ps2xua1eg1-2-0.gif The center connection at the primer bulb is the output return to the tank and the off center connection at the primer bulb is the inlet from the carburetor.

26117870-p2kvwqjbo3oi50ps2xua1eg1-2-2.png If it is correct you need to perform a leak check on the fuel system. Reach into the tank and retrieve the fuel filter attached to the hose. Carefully remove the filter from the hose and with your finger over the end of the hose pump the primer. You should hold a vacuum. If the primer will not stay down air is leaking into the fuel system. Any air will disable the engine from running. The carburetor needs to be air free to function.

If air is not leaking from a hose connection and is internal to the carburetor it is likely that contamination has logged either in the needle valve or check valve.
Below is the check valve that prevents air from entering the fuel passages from the fuel jets when you prime/purge the carburetor with the primer bulb.
26117870-p2kvwqjbo3oi50ps2xua1eg1-2-5.jpg

If the carburetor is filling with fuel when you prime it is likely that the the primer is pushing (incorrect hose routing) the fuel into the carburetor through the impulse pump and through this check valve. Correct pluming and try again.

The needle valve is located under the four screws under the diaphragm and is actuated by the diaphragm.

Cleaning the check valve is almost impossible. Most have a rubber washer that can easily be moved out of place from the use of excessive air pressure. The claim is that the check valve can be replaced. I've never been successful and ended up replacing the carburetor. Messing with the needle and diaphragm has not always resulted Joy either. You can leak check the needle valve by plugging the inlet hose and pull the fuel out the primer bulb connection using the primer bulb. Cleaning the carburetor with the small holes and blind fuel passages can create a problem by plugging the tiny fuel feed holes you are trying to clean.. In the newer machine the adjustment screws are not removable preventing the cleaning of the needle clearances. This is a bumpy road well traveled by many!!
Hope this has been a help?

Mar 04, 2016 | Poulan Pro Gas Chainsaw 18" Guide Bar 42cc...

2 Answers

My prime bulb looses pressure and first start is hard. I have to remove fuel line from filter and cover with thumb prime re install then first start takes time.


Does the engine run fine after it starts? Most common problem with primer bulb losing prime is an air leak in the fuel line or primer bulb. Air leaks don't always leak fuel. If there is an air leak between the primer bulb and gas tank there is no pressure, only vacuum. If it is not a major leak it might not leak without pressure but it will allow air to enter the fuel line. If it is a very minor air leak it could allow air to replace the liquid in the fuel line over time, but so little air once it is primer again that the fuel pump can over come it with volume of fuel.

Primer bulbs do not stay firm, as they are when initially pumped up, after the engine is running. There are check valves in the primer bulb that hold pressure in the primer bulb and throughout the fuel line to the engine. Once the engine starts the fuel pump creates vacuum drawing fuel into the engine diminishing this pressure and releasing the check valves. At this point the primer bulb is just another segment of fuel hose allowing fuel to pass through it as the fuel pump demands. The primer bulb functions much better when the outlet side is higher than the inlet side. This position makes it easier for the check valves in the primer bulb to seat and release as needed. If the primer bulb is functioning properly and is positioned with the outlet side higher than the inlet it should not be necessary to cover the end of the fuel hose with your thumb to get it to prime.

If the engine is hard to start after being fully primed there could be a problem with the fuel system on the engine. Some engines are hard to prime once air has entered the system, especially fuel injected models.

Dec 19, 2014 | Boating

1 Answer

1984 suzuki DT60 outboard set up for 5 yrs cleaned carbs got it running. wont stay running unless you pump the primer bulb. does it need a fuel pump?


yes. OR you have an air leak in the fuel system. Easy way to tell is with a clear fuel line between the fuel pump and the carb. If you see bubbles, you are looking at a new fuel line connector or aire leak at the fuel pump. If you pump up pressure with out the motor running A fault may leak gas.

Jul 09, 2012 | Light Outboard Motor Boat Bass Fishing...

1 Answer

Poulan/Weedeater 1500(150mph)blower. Always cranks easy,ran great for years! I Found "split open" gas line;the larger line , return I think(sucking air). I Replaced both lines. Now "WILL NOT...


If the primer bulb is sticking down then, first try taking the gas cap off and pumping the primer. If this solved your problem, the duckbill valve built into the gas cap needs to be replaced, or you can replace the whole gas cap. If this didn't solve your problem, you have a clog somewhere else in the system or an internal problem with the carb. Try taking a pair of needle nose pliers and pulling both fuel lines out of the tank. Take the fuel "filter" off of the line and try pumping the primer. If it sticks down still, your problem is inside the carb. A rebuild kit would probably fix it if you are confident in tearing down and reassembling the carb, otherwise you can just replace it for about 30 dollars.

Sep 08, 2011 | Poulan FL1500LE 25cc 150 MPH Blower

1 Answer

Model # 358.797180, 200 mph. At first I thought problem was carburetor being gummed up due to being improperly winterized by previous owner. Replaced carb with new, did not fix problem. Also replaced fuel...


The primer is just a small pump that is supposed to pull fuel through the carburetor from the tank supply line/fuel filter. The filter is supposed to be connected into the longer line at the rear of the tank. This lines goes to the carburetor uppermost port and the lower port is tied to the inlet side of the primer pump. Remove the tank side line from the pump during the pump test to make sure that you are not pulling fuel into the pump from the exit line. Try pumping fuel at this point--if nothing happens, swap the port connection at the pump and try to pump again--when correct, it will fill the tank supply line first, then the exit line from the carburetor that goes to the pump and finally fill the bulb. If you don't get fuel with either connection, then you have a leaking fuel line somewhere as you have already replaced the carburetor. Most saws use a rubber fuel line, not clear plastic. Hope some of this helps!

Nov 18, 2010 | Garden

1 Answer

It wouldn't run when I got it gas was leaking put new fuel lines on put carb kit in still will not run acts like not getting fuel


is the primer bulb full & stays full when trying to run it if not the the diaphram in carb is bad needs to be replaced or primer bulb itself has a leak

Nov 10, 2009 | Garden

1 Answer

Have a LT160. won't stay running. replaced filter, external fuel pump, all fuel lines. cleaned carb, jets....?????


did you check the primer bulb to make sure it was full of gas if it isn't the try to prime it if it doesn't fill up the theres a little diaphram in the carb. that might be ripped or broken & needs replaced

Nov 08, 2009 | Garden

2 Answers

Mower wont stay run n unless i hold primer in


If it is a float bowl carburetor may have a jet clogged or the primer bulb could have a hole in it. If it is a diaphragm type carburetor, the diaphragm may be stiff and needs replacing. Check it out.
Good day.

Nov 07, 2009 | Toro Garden

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