So after a 45 minute drive to the race track I turn the car off and go through tech inspection. When I go to turn it back on, it sputters to a stop. Still have full battery power and it seemed to want to start. Finally get a push to the pits from an ATV. After tinkering with it for ten minutes, it fires back up. I didn't make any major changes when in the pits though.
Decide to go home rather than die halfway down the drag strip and be "that guy" causing delays. Car makes the return trip home with no problems.
Later that evening, I go for another drive, but this time I'm logging with ECMlink. After about 30 minutes of driving and a spirited run up a hill, I pull off the highway. From 45mph the car sputters to a stop again. Wait five minutes, starts back up. Drive another mile, and once again, the car dies.
I waited another ten minutes and the car starts. The car makes the 30 minute drive home just fine with no more problems.

Like I said above, I have a data log from when it died. It's right about at 1,630 seconds when the car rolled to a stop. The only thing that jumps out to my inexperienced eyes is the WB reads lean at right about the death mark.

Is this a dying fuel pump? Or maybe an inconsistent signal to the pump, and possibly the ECU? Am I reading things right?

Car is a 92 AWD 1g. The car's had the below setup for months now with no problems. The only major change recently is new u-joints and t-case fluid.

Applicable Mods:
FIC 1050 injectors
Forced Performance fuel pump (not rewired)
Fuellab AFPR
ECMlink
Speed Density
MHI Small 16g (12psi)

Were you able to get a glance at your fuel pressure off of you afpr before it bled down?

1990TSIAWDTALON said:

Were you able to get a glance at your fuel pressure off of you afpr before it bled down?

Click to expand...

I forgot to mention that in my first post! I did check on every occasion. When the car died I'd get out and pop the hood.
The gauge is mounted on the fuel filter (instead of the AFPR), and it was
always at 0-10psi after the car died.

In the past, it usually held at around 30-35psi and would bleed off over the course of 15 minutes or so.

Boy that sure sounds like a pump problem if it is getting consistant 12-13 volts but down on pressure. I'm sure you have checked but the fuel filter isn't plugged is it? You could clamp off the return line to the tank and check that pressure but its way to low at 10psi.

I actually haven't pulled things apart just yet. I wanted to ask on here for advice first.
The pump and filter are about 2,000 miles old but maybe something got knocked loose in there.
I'll check voltage with my meter first chance I get as well.

Gosh I would hope that a pump last's longer than a few thousand miles, maybe those old small wires are just not powering the pump sufficiently anymore. Try turning the pump on in Link and check your pressure in the engine bay. If I were home I could look at your log. I will look at it when I get home this afternoon just to see if anything sticks out like a sore thumb.