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I have a bolens bl410 and when I push on the primer it won't push the fuel onto the carburetor

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They are not suppose it....They just suck the air out and fuel into the metering chamber.

Posted on Apr 27, 2015

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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...

1 Answer

Replaced fuel lines and primer bulb ON A BOLENS LB 160 25 cc TRIMMER. Primer bulb stays in and wont pop out. it pops out after abouot 3 minutes or if I loosen the primer bulb mounting screws


Check the carburetor internal filter screen for clogging. Also the primer assembly itself maybe bad. If the primer assembly itself is bad a new carburetor is in order.

Feb 09, 2015 | Garden

1 Answer

New primer bulb but engine won't prime


remove and clean the carby. clean out the main jet. ensure that there is nothing stopping the primer circuit from working. There are two valves under the primer bulb and a spring. when you push in the bulb fuel is squirted into the manifold When you take your finger off the bulb the spring pushes it out and new fuel is drawn past a valve to fill under the bulb. Pushing in again closes that valve and opens a second valve which allows the fuel into the manifold again

Apr 26, 2013 | Garden

1 Answer

Bolens cultivator model BL410 won't keep running


clean the screen inside the muffler

Aug 03, 2012 | Garden

1 Answer

My Craftsman Mowe rmodel# 917.376152 will not hold a prime?


This is a push mower. It does not have a fuel filter, so after about two years, small debris gets into the gas and then gets onto the carburetor. I added a small in-line filter to help. You will need to take the fuel line off and drain the fuel tank to flush then take the float bowl off and try clearing the passages with carburetor cleaner from the top down to flush. Reassemble and off you go.

Mar 04, 2012 | Garden

2 Answers

Need to know how to connect the gas lines from the primer bulb to the carburetor on a poulan woodshark model 1950 chainsaw


The lines should be connected to push fuel into the carburetor. The output (overflow) of the carb is routed back into the tank. So, two lines in the tank, one is an overflow (return) and the other is the suction. On the primer one line from the tank and the other to the carb. Connect so as to "push" fuel into the carb when the primer bulb is pushed.

Jun 16, 2010 | Poulan 14 in. 2.0 Peak Horsepower Electric...

1 Answer

I have a poulan 2450 chainsaw and i can't get the primer bulb to **** any gas, the bulb is in good condition however there is gas leaking out of the gas cap in the center of it, do I need a new gas cap and...


You may be overfilling the tank somewhat so that expanding fuel (from engine heat) is being pushed out of the vent. Check the fuel filter for plugging and all of the fuel lines for any rot, splitting, or other damage. The primer bulb is supposed to pull fuel from the fuel filter, then through the carburetor and on to the primer which should push the excess back into the tank through another line. If the above does not allow the primer to pump fuel, then dismantle the carburetor, clean with carburetor spray cleaner, and rekit it. Go to: http://www.drystacked.com for a 12 page article on Walbro brand carburetors--theory and troubleshooting. This information applies to most brands of carburetor. Hope this gets you running!

May 31, 2010 | Poulan Wild Thing 2375 18" Gas Chain Saw...

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