1988 Jaguar XJ6 No Start

My 1988 XJ6 will not start it tries to start then dies off. I have checked spark and air filter and gas it is getting all three but it may not be getting enough how much fuel pressure should there be after the regulator? I hear the pump run and have opened the line after the regulator and turned on the car and fuel comes out but not with a lot of force it just kinda has a quick burst then just runs out it this correct or should there be more pressure