Hello I have a 2009 Fiat Doblo 1.3 Multijet and recently I've had "Water in Diesel fuel filter" light coming up, so I've drained the diesel filter twice, since then light has gone but now it takes 5-6 attempts to start from hot and a couple of seconds from cold. Glow plugs, air, oil and fuel filters got replaced yesterday, the guy who helped me with that suggested it might be the air trapped since I've not re-filled the filter with diesel after emptying it. Thanks in advance.