Inside the gas tank .
Check with your local lawn mower repair shop
Might be the fuel filter? Fish around in the tank and see if you can retrieve a tube that will connect to it.
For a 17-inch, 25cc Craftsman Weedwacker model 517 798580, you can typically find a replacement fuel tank through authorized Craftsman dealers or online retailers specializing in outdoor power equipment parts. Check websites like Amazon, eBay, or parts-specific sites like RepairClinic or PartsTree. Make sure to verify the part number and compatibility before purchasing to ensure it fits your model. If you're having trouble finding it, consider contacting Craftsman's customer service for assistance.
Check your fuel lines, they come out of there holes on the tank.
If the bulb is cracked or the line going to it is it will not work, also make sure the hose going to it is submerged in the fuel. another possibility is that the vent hose is plugged and the tank has too much vacuum pressure to allow the fuel to be sucked up.
Diagram showing where the lines from the fuel tank go at the carburetor and the primmer bulb.
drain the fuel, remove the fuel filter from inside the tank, remove the old fuel line from the filter, remove the old fuel line from the carb, pull old fuel line out, install new fuel line through the tank, reconnect fuel filter to new fuel line, place filter and slack line into tank, connect new fuel line to carb, refill tank, check for leaks.
Depends entirely on which craftsman lawn mower you're referring to.
Remove the fuel lines from both Ann's of the fuel filter. The lines can be removed by loosening the clamps. Reverse the process to install the new fuel filter.
Dump all of the fuel out of the tank. Then take a pair of long needle nose pliers and grab the end f the fuel line. Inspect it for swelling or complete disentegration. The ethanol added to gas that is now mandatory in many states is very tough on fuel line. You may have to replace the fuel line and put a new fuel filter on while you're at it. Patience is a virtue.
its between the fuel tank, and carb. its round and about an inch long
The gas to oil ratio for this type of trimmer should be 40:1. Sears sells the premixed fuel for $4.99 http://www.sears.com/shc/s/p_10153_12605_07136521000P?keyword=fuel+mix