2001 Mercedes-Benz ML320 Q&A

2001 Mercedes-Benz ML320 Question: Why wont it start

First it would start and run for a few seconds then just die then it would start at all but would turn over so we thought it was the fuel pump and fuel filter so we replaced them only to find out the fuel pump that was in there was recently put in ( looks new still) but still it will turn over but no start we have checked all the fuses under the hood and inside the car and they are all good please someone help I feel as though we are banging our heads into a wall we cant afford to take it to a shop -
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