My 2000 Ford expedition 4 x4 started right up and ran in till my wife poured then wrong gas in it that had some stuff floating in it and it quit running and won't start up if I replace the fuel pump
What do you mean wrong gas? any type of gas will work in your car. The nozzle is different for diesel Fuel so that nozzle cant fit in. Normally if get foreign substance in your tank you may need to do the following. Remove the bad gas from the tank. Blow out and clean the fuel lines. Change the fuel filter. The pump may have to be changed, it should be tested First and you may need to clean or change the injectotrs.
Wrong gas? Guessing she used a gas can at your home with dirty fuel in it?
If she filled up at a gas station it would not matter which grade of gas she use and as has been stated, the diesel pump has a larger nozzle so it won't fit. Ask her if the nozzle went ALL the way into the hole in the filler. If it didn't, then there is your problem. VERY CAREFULLY remove the old fuel, change out the filter and put in about 5 gal of REG and try to get it started. You will still have the old fuel in the intakes. You may need to try some starter fluid.
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