my white mtd gt 205 20hp v twin ohv vanguard riding mower model 351777?

yes it has a fuel pump, it is the device you described having fuel lines coming in and out, try very low pressure air to blow backwards through the pump to blow water or whatever else could be in there out of the pump.. dont blow the direction of fuel, you want the stuff to come out the way it came in, if there is crud in the pump it may ruin the diphram in the pump if you blow forwards

Chris
May 2009