In article <firstname.lastname@example.org>,
> Thanks for all the thoughts folks! I'll investigate the fuel pump and
> such. I have a new fuel pump relay that I had ordered as a spare, and
> will try that to see if it solves the problem. If not, maybe I'll
> order a new fuel pump just to be safe, in case it's weakening and
> acting up. I assume the check valve someone was mentioning is part of
> the pump?
BTW any drippage from the injectors will also allow the sytem pressure
to drop. Sometimes a hot soak will force fuel from the injectors and
after an extended cool down leave an air pocket in the fuel rail. By
bumping the starter the injectors don't stay open and the pump overruns
for a few seconds and quickly recharges the system.
The injector tips live in an extremely hostile environment and are the
victims of deposits than can form on the sealing surface of the pintle.
Using an injector cleaner, such as Chevron Techron, or BG44K, can
effectively remove deposits when used with a tankful of gas during
normal everyday driving. IOW don't use it when you're going on a trip
because iy acts slowly and depends on the regular heat up cool down
cycles to properly do its job.
The goal when driving is to miss the maximum number of objects.