87 motorhome 460 carb. eng. starts but dies in minute

What is your question?

I Have pulled both filters the in tank pump is pumping revs up strong and then dies idles ok but then dies in a minute I have to pump the gas peddle to get it going it does backfire a bit on starting but runs not bad, but when it decides to quit there is no coaxing it, it just quits. the oil pressure is great. please any direction.