Fuel Spits sputter pops and bangs under load. Help wanted
- By AeroCoupe
- Fox 5.0 Mustang Tech
- 5 Replies
With the vacuum line connected and at idle the pressure should drop to around 30 psig. When you rev the motor the pressure should increase as the rpms go up and load is put on the motor i.e. loss of vacuum. Are you sure you have a good source of vacuum? Almost sounds like there is horrible blow by and the vacuum system is pressurized when it revs up. Does the fuel tank have adequate ventilation?