When you unplug the 6 pin connector from the box you should be able to hear the fuel pumps, perhaps he switched off these.
Both pumps are located at the bottom of the left fuel tank just in front of the rear wheel.

It's the connector below this shield with the brown rubber boot

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RaymondQV
Countach QV Ex-Mimran #GLA12997, Urraco P300 #20530 sold in August 2008, Jalpa #FLA12203 sold in May 2006
www.countach.ch
www.jalpa.ch

When Frank Sinatra got his Miura S in 1970, he said: “If you wanna be someone, buy Ferrari - If you are someone, you own a Lamborghini”.