Small Engine Troubleshooting Problems? Ask a Mechanic Now.
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In answer to your fuel pump question. Yes, they do have a fuel pump on them. It is the round black device that the fuel line goes to from the fuel tank, it is normally mounted above the right side valve cover, it will have three hoses going to it(one from the fuel tank, one to the carburetor and a third one from the valve cover itself).
You may also want to the check the electric fuel solenoid on the bottom of the carburetor, it may be losing voltage once the ignition key is released to the run position. It requires a steady constant voltage to keep it open in order for the engine to run.
Unplug the wire that is going to it and check with a voltmeter to make certain that when the key is turned to the on or run position that it has a constant 12 volts coming down to it. Normally this has a connector with two wires coming to it, only one wire is hot the other is a ground. If you put the probes of your voltmeter into both of those wires you should get a steady constant 12 volts with the ignition key in the on position even without the engine running.
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