2002 Citroen C5 • 4 cylinder 2WD Manual • 185,000 miles  My car
usually starts on first attempt. This morning it took 3 attempts
10 minutes apart before it started (I understand due to cold
weather), but how can I tell if my car has a problem? November
24, 2010.  If it's really cold outside, maybe there's water in
the gas. Try using a bottle of "Heat" in the gas tank first.  If
this doesn't work, maybe the pressure regulator has developed a
leak and is sending the fuel back to the tank when you cut the
car off. The FPR is designed to keep fuel pressure at the engine
when the car is off, so when you try to start it, it starts
right away instead of having to push fuel from the tank up to
the engine.  Ernest Clark Nov 24, 2010.