Longitudinal separation on ground
 

During taxiing, is there a minimum distance (legally speaking) that should be maintained between my aircraft and the preceding one?

Unless rules have changes, no!

To the best of my knowledge, there are no rules imposed by ATC anywhere; but there may well be some airlines who have rules or guidelines....

Longitudinal separation on ground
 

Just bear in mind that his engines might kick things at your aircraft and you'll get a nice burnt-kerosene smell if it's getting drawn into your intakes.

You also will want to mind Your deicing fluid on the wings if present: the jet blast of the preceding has a tendency to blow parts of it off prematurely, leading to possibly interesting results during a subsequent takeoff.

737-800s at Dublin require about 20 feet more than you think, apparently.

There have never been any rules about longitudinal spacing between a/c on the ground - unless they left out these details during my 43 years in ATC !

@Interested Passenger
 

That was a lateral separation issue

Longitudinal separation, when not involving stop bars etc, is at Captain's discretion on the ground

'Only a fool breaks the two-second rule...'

Depends, in LVPs you may find 'block separation' imposed.

Ie only one aircraft can be in anyone taxiway block, usually delineated by stop bars

Get a grip people!!! If you like sniffing the proceeding exhaust fumes at 2 metre's enjoy..........