1989 Oldsmobile Cutlass fuel injectors have current but no

1989 Oldsmobile Cutlass 6 cyl Front Wheel Drive Automatic

When we put petrol in the intake manifold it starts and engine stops when pertrol finishes.
The fuel is manually put in through the brake boster vacum pipe.

Kindly let us know how to solve this problem

Note: The car was parked for more than 2 years and this problem occured.
There were rats residing in the engine compartment
may be this may help you to suggest a remedy

Awaiting your reply

Thanks

Khalid Mahmood