I recently purchased a late 99 F250. I love this truck! I have had if for about three weeks now, and i have been doing some preventative maintenance. Oil, fuel filter etc. Im working on putting in herculiner now. However, last week i changed the fuel filter, and it seems to take more cranks to start. It used to take about 2 seconds of cranking to start, now it takes like 3 or 4 seconds. Is that normal after a fuel filter change? what may be causing this, and can it be fixed?