I urgently need a high pressure (gas) pump for the 2001 Chariot Grandis

high pressure fuel pumps are generally universal. get a 255 output performance fuel pump online just type that into google and you should find a few sites with good ones.

What about the factory pump. Know where I could get that.

I was recently advised to change my gas pump, which I did but I am still having the same problem.

The problem is that when I try to accelarate or rev the engine the engine looses power and give this sputtering kind of feeling. Anybody had this problem before or might be able to give any insight as to what the problem might be.