my 1997 diesel p38 wil start but takes quite a few turns of the starter before it fires up wheather its hot and cold i have had new glow plugs in but still no change it seems to start a bit better if i put jump leads from another battery to the battery on the rangie.and i put another battery on this norning and its still the same so could my problem be fuel related or is it somthing to do with the glow plugs or relay? any help i would be greatful