2fast97Z

iTrader: (20)

ok so brand new 383 put in and it started perfect all last week but got to today and got the pan back on(had to clearance it more) and tried to start it today and it was very hard to start..took about 3 or 4 3-4 second cranks to get it started and then it would idle alright for a couple of minutes and then just pick a random time to shut off..so hooked up a fuel pressure guage and it was 48psi KOEO(key on engine off) BUT only for .000001 second it would automatically just slowly start going to 0 psi no matter what..so took the rail off and set it on the ground and put all the injectors in the rails to make sure an injector wasnt stuck open or something and nothing leaked but still went down to 0 PSI...i think its the check ball or w/e in the fuel pump and also when you turn the car on the fuel pump started making a different noise like an alternating buzzing noise like different pitches so correct me if im wrong or not but does it not sound like the check valve or what? please help i want to get this damn thing running

ssdriver27

iTrader: (15)

check fuel filter then pump go from there ~Guy

Old Geezer

iTrader: (3)

it was the check ball, once the ECM got a cranking signal, the pump should stay running, and maintain pressure.
The fact it will not , leads me to agree w/ SS Driver... Do the easy item[s] first, then the pump.
Not out of gas, are you??
How long did the car sit, b4 you changed engines??

2fast97Z

iTrader: (20)

6.5 months with 1/2 a tank of 108 race fuel

2fast97Z

iTrader: (20)

but why would the fuel filter keep it from holding pressure?