My truck has been on jackstands for the past 6 mos.[doing some front end work] and about twice a week I crank it and let it run for 20 mins. Well three days ago I cranked it up as usual and after 10 mins. it shut off. I tried to crank it up and it would hit a couple of times and thats it. I just replaced the fuel pump but not the filter so I did that today. Tried it and it wouldnt do anything. Took the fuel line loose on top of the motor, turned the key and fuel came out. Took the intake pipe off and squirt some gas in it and it fired up, idled fine but when I give it gas it stalls out.It will not crank on its own, I have to squirt gas in the intake to get it to crank. What do you think it could be. Pressure regulator????