MTD Mower not getting enough fuel

thecooksterOctober 5, 2008

I have an MTD mower with an 18hp Briggs and Stratton engine. It's not getting enough fuel. I've replaced the fuel pump diaphram and the springs but it's not helping. The kit definitely went in correctly.

I don't understand what else it can be. When we took the carb apart there was hardly any gas in the chamber so that is definitely the issue.

Anyone have any ideas? I'm about ready to just give and sell this thing.

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shotzi(7 Tn.)

Check the hose that supplies the pulse for the pump this hose may be craked or kinked.If this is not the problem then lower the fuel hose low enough to be sure that the fuel line is clear & the fuel is flowing freely.LOL


    Bookmark   October 5, 2008 at 5:22PM
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I am guessing this is an opposed twin. Fresh fuel is a good place to start. As shotzi noted- confirm fuel flow though the lines to the carb. Catch some in a pan where you can see if you have debris. Fuel lines need to be also in good enough shape to allow the pump to work. Lines are even more important if your model has a rear mounted fuel tank. Good flow, then pull the top off the carb and clean the 3 passages out where the bowl and top meet as well as the one that is behind the bowl drain nut you just pulled as you cleaned the bowl.

    Bookmark   October 5, 2008 at 7:36PM
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I think those have an inline fuel filter. Maybe it's stopped up.

    Bookmark   October 6, 2008 at 1:26AM
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The vacuum line to the fuel pump looks in good shape but I can't seem to get in there to remove it. They didn't make it easy. I have replaced the fuel filter and serviced the fuel pump. A friend and I cleaned the jets and ports.

The engine is a B&S 422707, 18HP opposed twin. Fuel tank is in the rear.

Next step is to replace or just remove and plug the fuel solenoid and although I seem to be getting good flow from the tank - replace the gas line from the tank.

It's definitely not a valve clearance issue.

    Bookmark   October 6, 2008 at 7:35AM
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