S50 starts but won't stay running

[Danny]

I can start the car time and time again and all it does it start and then die.

All my vacuum lines are good, no leaks. I'm stumped.

[Wh33lhop]

Dies immediately? No idle at all? What if you goose it?

[Danny]

Idles for a quick second, then dies.

[Wh33lhop]

Does it stay running if you give it some throttle?

[Danny]

No, the gas pedal is nonexistent as soon as it decides its done running.

[ak-]

Have you tried starting it with the icv disconnected? Is your idle gay when running?
If that makes sense.. Idk about mx/sx engines well, but that pointed to the problem on my m20.

[Danny]

What attempts did you make to fix it besides looking for vacuum leaks?

Switched main relays, adjusted throttle cable, unplugged maf, unplugged tps.

Nothing helped. Although I think my spare main relay maybe be bad as well, if that's the problem.

[gobuffs]

sounds like EWS

[BenM]

Sounds like you aren't getting fuel. Start with easiest first those being fuses, fuel pump relay and main relay.

[Danny]

But it does it AGAIN and AGAIN, so why would my fuel pump only work at start up?

[Jean]

Maybe it can't build up/keep pressure and it lets you only fire up the engine and then it dies? Do you have a fuel pressure gauge?

Can it be a CPS?

[Danny]

If it was the CPS it wouldn't start no?

[e30s50dan]

Try starting fluid See if it will run on that for 10 sec or so. If it does, then chase the fuel issues. See if can get a fuel pressure Gage Helped me!

[Danny]

Now it revs itself to 1500 and dies straight away.

[Farbin Kaiber]

Fuel Pressure Regulator?