Take it in shop for a fueling system pressure test: if needs long cranking after was parked use the manual pump to avoid damaging the starter until you have it fixed. I believe are the injector cups(2000-2500$ job),and the leak is getting worst and worst csuse cause a cilinder to misfire and stop, is going to let you down on the road; I did the injector cups 3 times in my D13, once I got towed. This leaking cups is the worst problem for D13, but D12 wasn't as bab could be different issue.