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I have used isopropyl alcohol or a fuel additive like Sea Foam. For stubborn varnish or sludge, add a handful of stainless steel ball bearings or rock salt and shake the tank vigorously to act as a gentle scrub. It worked for me but I did leave it soak for a day cleaned it out and repeated it...

Replaced the starting coil and running strong.

A Stihl FS91RZ trimmer loses power after using it a while. Changed out the spark plug but still doing the same thing. Any suggestions what I should be looking at? It has been like that since purchased. Was taken back a few times and all they did was “adjust” it to the point the warranty ran out...

Update. It’s running! Had a few things wrong with it. I did have to replace the carburetor because the gas line was melting and gooey and would clean up. So the gas line from front to back, to the pump and out of the pump to the carburetor were replaced. Putting it back together the chock...

Lol

The fuel line from the tank to the carb has been replaced. I got it started but it will not throttle up. I am now thinking the governor has an issue. Also this is not a Nikki carb. No selenoid on the bottom.

Thanks. I ordered it.

I wasn’t the one that replaced the fuel pump so not sure if it was tested. Here’s an update. I replaced the carburetor. The mower started right up HOWEVER it will not throttle up.

I got it started but it would not throttle up and after while it died out. Trying to start it again it would backfire and the carburetor is flooding.

I’m going to replace the carburetor and see what happens.

Safety switches are functioning.

There is no gas shut off. Tank was cleaned out and fresh gas and new gas lines put on. Gas filter was changed and facing right direction

Cooling fins are clean

Spark plug tester

Someone did put an aftermarket carburetor on it. But this carburetor doesn’t have the fuel solenoid there are no wires coming in to hook up.

I have a spark plug tester.

I have a John Deere LT 150 150B505432 with a kohler CV15S. 41618 engine that will not start. It has spark and the fuel pump has been replaced. New gas lines new gas filter changed the air filter. Cleaned out the gas tank. New gas gap. Gas lines and gas cap were changed because they were very...

One the back of the carburetor you will see a black hose ( breather tube)attached. Remove it if you can. If not pull on the carburetor until you can get to it. Those carburetors are held on with two inner screws through the cover. The outer two screws hold on the air filter housing. After that’s...

You can actually eliminate that by replacing it with a piece of galvanized pipe cut slightly longer for easy access. Match the threads and on other end put a screw on cap to prevent leaking.