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The trimmer will not start, the prime bulb sticks when pressed, gas is not flowing through the carburator

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Many things can cause the unit not to start (see www.zama.com) for troubleshooting their carbs and what causes a no-start condition. If the purge/prime bulb is sticking..there could be a bad fuel filter in the tank with a side condition of bad fuel lines...ruining the vacuum action needed to operate the bulb correctly. It helps to understand (and you may) just what the purge/primer bulb does. It "pulls" fresh fuel into the body of the carb by "pulling" out any air and old fuel in the body of the carb...then it "pushes" this air/fuel mixture (with new fuel lines you can see this) back to the fuel tank. ...and it sounds like you need new fuel lines also.

Posted on Jul 16, 2010

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1 Answer

Weed Eater Priming


Check out the tubing to the carb. If it is good then the top part of the carb with the check valves is defective. If so, you need a new carb since those suckers cannot be fixed.

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Craftsman tiller won't start unless I manually prime cylinder with gas. There is no primer bulb. Can I retrofit a primer bulb in the gas line?


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You can insert a primer system into your fuel system
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Please take time to rate me
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1 Answer

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Could be a few things: Got enough petrol? The petrol MUST be above the filter in the tank. You need about 3/4 " of petrol. Or the filter could be blocked. To check, disconnect the fuel line at the back of the primer bulb, and see if the fuel flows freely. But first make sure that you have something to catch the fuel. AND NO SMOKING!!! Or the bulb might be perished, and letting in air. In this case, disconnect the two fuel lines, taking note of which one went where, pull the little lugs on the side of the bulb holder so that the bulb comes out, and simply reverse all that with the new bulb. Please don't forget to rate this answer.

Oct 19, 2011 | Craftsman 25cc Gas Line Trimmer

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I haven't been able to get my trimmer to start since the first day I got it. I think it is not drawing fuel when I prime it. Things to check, or what other causes it might be.


Start by spraying some starter fluid into the carburator. If it starts and dies after few seconds then you most likely have a fuel problem.

Press the primer bulb about 6 times. There should be gasoline flowing through both gas lines the intake and overflow. If not check that the filter ( attached to the end of the intake line ) inside the gas tank is not plugged. It can be removed for testing purposes. Rplacement gas lines and filters are available in places like Sears, Home Depot, Lowes etc.

If the unit does not start with the starting fluid you may have an ignition problem.
Remove and clean the spark plug. Attach the spark plug wire to the plug and hold the threaded part of the plug againt the metal head of the engine. While closely wathing the gap have someone pull the rope and turn the engine over. You should see a small spark jump the gap of the plug.
If not start by replacing the plug ( cheapest, easiest first).
If the unit has gas andspark nd still does not start remove the carburator and disassemble it.
Soak the body in fresh gas for about 10 minutes and blow out the port with small engine carb cleaner ( also avail at the prementioned stores).
Those small carbs don't take much to become clogged.

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Sounds as though the fuel filter may be plugged. The filter is in the tank. Take a look, see if it is visible. Remove and replace. Good luck...Lee

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The primer bulb sucks fuel from the tank to the carb. When the carb has enough fuel the remainder is sent back to the tank. When you replaced the fuel line did you use the exact length of line and did you re-install the filter. On some of the trimmers the filter is weighted and holds the line in the fuel. Good luck...Lee

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1 Answer

Engine starts when I hand prime it,but not when I use prime bulb.


There are two screws on the carb. 1 is Lo rpm air/fuel ratio and the other is hi rpm. Try adjusting the lo rpm screw counter-clockwize a 1/2 turn at first, more if needed. After each adjustment try to start. The other thing you could check is if the float is sticking in the bottom of the carb. which shuts off gas flow if full. There is a screw on the bottom of the carb to drain that float. You can try that also! Good luck man!

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1 Answer

Husgvarna string trimmer stahls.


Try getting some carb and choke cleaner and spraying down the carb. You might have some varnish in the carb and it won't let the fuel flow properly. My ryobi 4 cycle trimmer does that every year. I clean the carb and it usually runs decently.
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roundo4

Aug 09, 2009 | Garden

1 Answer

Have old Eager ****** 280 Gas Trimmer, Replaced Gas line, cleaned filter, tubing and Primmer Pump return line, still won't Prime, and start engine. Pust some gas in spark plug, engine run for a few...


If the bulb is good and it still won't prime, then you have either one more tube (there are usually 3) to replace, OR, the gas pickup in the tank has a plugged filter or a plugged line. I'd check it first.

Sirwriter

May 14, 2009 | Garden

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