Some of the 99's had a problem with the pressure relief valve/regulator in
the tank leaking down. Unfortunately, the factory leakdown test only
detected gross leak down problems, not ones that might occur over more than
24hours. In any event, a revised replacement valve was made, and should be
what you will get if you order a new one. I still think the no return line
system used on the 99 and later NB's is a mistake.
Replacing the valve requires normal hand tools, an open well vented area
away from any source of ignition, and reasonably high humidity.
The top must be up, and the rear deck rug and access plate removed. The
whole fuel pump/tank sensor/regulator assembly comes out from the top of the
tank as a unit. Some of the roll bars may be in the way.

The easiest way to measure fuel pressure on a 99 is to order the short hose
assembly with quick release fittings that is used on the passenger side of
the engine down by the frame. You cut the hose and insert a tee and a FP
gauge. Since some of the hoses were plastic, you may need to substitute
rubber hose and clamps if you are using the hose that came on the car. You
are really buying the hose assembly to get the quick disconnect fittings.
The fittings by themselves may be available now-- they were not when I last
got into this area in about 2002.

"Bruno" > wrote in message
k...
> XS11E wrote:
> >
> > I don't know if it's important. I was thinking if it started right up
> > after running awhile but took a long time after sitting overnight a
> > leaky valve in the fuel pump might be allowing fuel to drain back into
> > the tank so there wouldn't be enough pressure in the fuel rail for an
> > instant start but that seems unlikely if it's not a big difference.
> >
> Hmm, it sounds like a possible theory. If one imagines there is only so
> far the fuel can drain back it could very well be that certain level of
> delay is reached after like a day or so and that the level won't change
> much more regardless of time. This is total speculation on my part as I
> really know to little about these things.
>
>
> > Looking at real obvious stuff.... how old are the spark plugs and plug
> > wires?
> >
>
> Plugs was changed at the big service this summer but that did not change
> anything. The plug wires could be the original 1999 ones or they could
> be little more than a year old - I must admit to buying a car without a
> service history so many things are pure guess work.
>
> Kind regards
> Bruno