1995 Nissan 240SX fuel delievery problem

So I have a 240sx and two days ago I turned it on and drove it about 100 yards and it died.

I assumed it was out of gas (the fuel gauge does not work so I wasent sure.) After putting 5 gallons in and tried it, it still would not start.

I then checked and replaced the spark plugs with all new ones, but still nothing, so then I thought there might be a problem with the fuel not getting to the engine since I was able to confirm that there was a spark.

I bought engine starting fluid and sprayed it it into the intake (4 short sprays) then attempted to start it and it did. However it then died after about 15 seconds.

I also checked the fuse for the fuel pump and it is fine.

the car will crank just fine it just will not turn over unless I use starting fluid and then it wont stay running for more than a few seconds.

do you think that the fuel pump needs to be replaced or what else would it be?

Thanks

Travis