If the car has not been run for 3 months and the fuel tank was not completely full, there could be water condensation mixed with the fuel or corrosion on the tank walls, both of which could have clogged the fuel filter(s). Replacing the filter(s) is here
Check the fuel by disconnecting a petrol line at the injector rail

-- IGNITION OFF AND BE CAREFUL TO CATCH THE PETROL THAT MIGHT SPRAY OUT--

Lead the pipe into a small bottle, switch the ignition on and check for water/dirt in the petrol.

Smell / leakage of petrol: The E32 can have a problem with the fuel pipes, particularly the joints of steel pipes and rubber hoses.
In the engine room the rubber hoses become hard with age and start to leak.
The early models used a crimp type clamp that should have been replaced with a more regular screw type.
The problem areas are the pipes/hoses against the firewall. With the 750 models they are difficult to access.
These are the service instructions (PDF) on the matter

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