Bugatti T51 at the Goodwood Revival - practice session 

hugybgrl Hi, the driver is pumping to pressurise the fuel system

Shouldn't be necessary IMHO if you put the cocks on the airtap cluster in the right position after firing up the engine and if the mechanical airpump is working properly.

the turbo boost probably

That's why the old racing cars were driven with a riding mechanic too !

I was thinking oil