Poulan Wild Thing Primer Bulb (Causes & Fixes)

A Poulan Wild Thing primer bulb that will not fill, empty, or stay full points to a fault in the bulb, fuel hoses, tank pickup, or carburetor purge path. Identify your exact saw model, follow its hose diagram, and test the circuit before replacing parts. Never start the saw if fuel is leaking or a hose is wet.

The starter rope feels heavier each time you pull, and the smell of fuel clings to your hands. Before you pull it 30 more times or buy a carburetor, check what the primer bulb does. Its behavior can narrow the fault to a few parts.

“Wild Thing” covers different saw models and revisions. I use the model number on the saw’s label to find the right manual and parts diagram. That matters because bulb style, hose routing, fuel mix, and carburetor details can vary. The guide below helps you trace the bulb circuit without guessing or changing carburetor settings to hide a fuel fault.

Identify the saw and make it safe

The model number links your saw to the correct manual and fuel-system diagram. Use that information before you remove hoses or order parts. A hose that fits a nipple may still be on the wrong port, and a bulb that looks right may not match your saw’s setup.

Find the model-specific fuel information

The identification label is usually on the saw body. Record the complete model number, including any letters or suffixes, and use it to locate the matching owner’s manual and parts diagram. Check the fuel mix and hose layout there. Do not rely on a general Wild Thing diagram if the model differs.

Many Wild Thing manuals specify a 40:1 fuel-to-oil mix, equal to 3.2 US fluid ounces of two-cycle oil per 1 US gallon of gasoline. Follow the manual for your exact model. Use fresh, correctly mixed fuel, and discard stale or contaminated fuel according to the fuel and oil makers’ storage guidance. Do not substitute 50:1 unless your manual permits it.

Reduce fire and injury risk before inspection

Switch the ignition off, engage the chain brake, let the saw cool, and disconnect the spark-plug lead before servicing. Work outdoors, away from flames, sparks, and other ignition sources. Wipe up spilled fuel. Keep the chain clear of your body and the work surface.

Do not start or run the saw if you find fuel on the bulb or hoses, see a leak, or smell fuel from a damaged connection. A leak near the cylinder or muffler can ignite. Let the saw cool, move it away from ignition sources, and fix the leak before starting.

Diagnose the primer bulb by what it does

A purge bulb usually draws fuel through the carburetor and sends it back to the tank when pressed. It is not always a direct fuel injector. Its behavior can point toward a blocked line, wrong hose routing, or a failed valve, but it does not prove which part has failed.

Press the bulb gently and watch what happens. Check the fuel level and look through the tank if you can. Do not force a collapsed bulb or keep pumping if fuel leaks. Use the model’s diagram to confirm which hose supplies the carburetor and which line returns fuel to the tank.

If the bulb will not fill

First, check for fuel in the tank. Then inspect the tank pickup filter and the hose that carries fuel from the tank to the carburetor. A clogged filter, cracked hose, loose connection, or incorrect routing can stop fuel from reaching the bulb circuit.

If those parts look sound, the restriction may be in the carburetor passage or the bulb’s check valve. A check valve controls fuel flow in one direction. Do not assume the bulb itself is bad just because it stays empty; test the hose route and pickup first.

If the bulb fills but will not empty

Fuel should move through the purge circuit and return to the tank. If the bulb fills but does not release fuel as expected, inspect the return hose and the tank fitting for a blockage, damage, or wrong routing. A failed bulb valve can also interrupt the flow.

Do not swap the hoses to see what happens. The carburetor ports can differ by model, and bulb nipple position alone does not show which hose goes where. Follow the exact parts diagram.

If the bulb leaks, collapses, or will not stay full

A split, hardened, loose, or collapsed bulb needs close inspection. Also check the hose ends and the full length of each hose for cracks or poor seating. Replace damaged parts with components that match the saw’s model.

A blocked tank vent can disrupt fuel flow, but that does not prove the bulb is faulty. Inspect the vent as part of the fuel system, not as a reason to replace the bulb without evidence. If fuel is wet around a connection, do not start the saw.

Repair the fuel circuit without guessing

The repair should follow the fault you found, not a parts list made from guesswork. Use the model’s diagram to identify the tank pickup line, carburetor connections, and return line. Replace only parts that are damaged, blocked, or confirmed to be wrong for the saw.

Trace and reconnect hoses by the diagram

The tank pickup and filter feed fuel to the carburetor. The purge return line carries fuel from the carburetor back to the tank. The exact carburetor ports and hose layout vary, so mark the lines before removal if they are still in place and correctly routed.

If the old routing is unclear, do not use the bulb’s nipple position or hose length as your only guide. Find the diagram for the exact model. Seat each hose fully on its fitting and make sure it is not kinked or pinched when the saw housing is reassembled.

Replace a damaged bulb or hose

Use a model-compatible bulb and fuel hose. A part that fits the opening may not be the right size or type for the saw. Check the parts listing for your model and revision, and inspect hose connections for a secure fit after assembly.

Replace any hose that is cracked, stiff, split, or loose at a fitting. Do not seal a damaged fuel line with glue or tape. Once the parts are installed, add the specified fuel mix and inspect the full circuit for wet spots before starting.

Verify the repair, then start the saw

A repair is not complete until the bulb moves fuel as intended and the saw runs without leaks or abnormal behavior. Prime and start the saw using the procedure in its manual. Stop if the bulb collapses, fuel appears, or the engine runs poorly.

Press the bulb as directed by the manual, watching for fuel circulation and the expected purge behavior. There is no single press count that applies to every Wild Thing model. Check closely for leaks, then use the model’s cold- or warm-start steps with the saw on stable ground and the chain clear.

Once it starts, confirm that it idles without chain movement and responds normally to throttle. If it will not start or stay running even though the bulb works, check fresh fuel, the tank filter, spark, and carburetor condition. Do not keep pumping or adjust carburetor screws without the model-specific service procedure.

Use the saw for cutting only after the fuel circuit is leak-free and it starts, idles, and accelerates normally. If it leaks, stalls, or behaves abnormally, stop and fix the problem before returning it to service.

Two useful diagnostic examples

These examples show how the same symptom can come from different parts. They are diagnostic patterns, not proof of what is wrong with your saw. In each case, I would check the model diagram and inspect the full fuel path before ordering parts.

Bulb stays empty after the saw has fuel

An empty bulb does not automatically mean the bulb has failed. If the tank contains fresh fuel, the next checks are the pickup filter, supply hose, and hose routing. A restricted carburetor passage or stuck bulb valve can also stop the circuit from filling.

If the filter is plugged, replacing the bulb will not clear the restriction. Confirm the flow path and repair the part that is actually blocked or damaged. Recheck for leaks before starting.

Bulb fills, but the saw still will not start

A bulb that fills and purges shows that fuel is moving through at least part of the circuit. It does not confirm that the engine has spark, that the carburetor is metering fuel correctly, or that the fuel is fresh and properly mixed.

If the bulb behaves normally, avoid replacing it without another sign of failure. Check fuel quality, then follow the manual’s starting steps and the proper checks for spark and carburetor condition. Stop if you find a leak.

Common questions about the Wild Thing primer bulb

The answers below cover common bulb and fuel-circuit questions. Because Wild Thing saws vary by model, use the exact manual and parts diagram for hose routing, fuel mix, and starting steps. If fuel leaks, do not start the saw while you troubleshoot.

Why will my Poulan Wild Thing primer bulb not fill?
Check the fuel level, tank pickup filter, supply hose, hose routing, carburetor passage, and bulb valve. A blockage or disconnected hose can prevent filling.

Why does the bulb fill but not return fuel?
Inspect the return hose and tank fitting for a blockage or wrong routing. A failed bulb valve may also prevent fuel from moving back to the tank.

Should the primer bulb stay full?
Behavior varies by system and model. Follow the manual’s purge instructions. If the bulb leaks or will not stay full, inspect the bulb, hoses, connections, and fuel path.

Can I switch the two fuel hoses to test them?
No. Hose routing and carburetor ports vary. Use the exact model’s parts diagram; trial-and-error routing can cause a no-start or a fuel leak.

Is the primer bulb a fuel injector?
Not usually on a purge-bulb system. Pressing it typically draws fuel through the carburetor and returns it to the tank. Confirm the circuit in your model’s diagram.

What fuel mix should I use?
Use the ratio in your exact model’s manual. Many Wild Thing manuals specify 40:1, or 3.2 US fluid ounces of two-cycle oil per US gallon of gasoline, but verify before mixing.

Can I start the saw if the bulb or hose is wet with fuel?
No. A wet or leaking fuel system is a fire risk. Let the saw cool, move it away from ignition sources, and repair the leak before starting.

The bulb works. Why will the saw not start?
Check that the fuel is fresh and correctly mixed. Then follow the manual to check the filter, spark, and carburetor. A working bulb alone does not confirm these are sound.

Can I use any replacement bulb that fits?
No. Use a bulb and hose components listed for your model and revision. Similar-looking parts may not match the fuel circuit.

Should I adjust the carburetor screws to fix a bulb problem?
No. First repair the bulb circuit and confirm the hose routing. Adjust carburetor settings only as directed by the model-specific service procedure.

(This article was written by one of our staff writers, Robert Callahan. Visit our Meet the Team page.)