Car wont run for more than 4 miles

my car wont go for more than 4 miles before the engine dies as if it has run out of fuel it has run out once before, I was told that my remote battery when flat would interfere with the automatic imoboliser cutting of the fuel so I renued the battery but the problem continues when my car Battery went flat I charged it up and my car started first time I then left it running for 20 minutes and it did not cut out but as soon as I took it on the road 4 miles later it juddered to a halt as if had ran out of petrol even towing it would not start the car HELP!!!!!!!