People my 500 is running in the 85 eldo, but it runs for only about 30 seconds then it just shuts down. I am thinking maybe because i used the stock in-tank fuel pump it shuts off after the gas that goes into line at initial turnover burns out. But then i have a glass filter i can see the gas through and it looks full. When i first crank it if I give it gas it and an agressive idle it runs but then completely stops. would there be any reason the spark would give out? does anybody know what my problem is before i start replacing parts!

Just had a thought im going to take my alternator and get it checked!

No its not the alternator, darn thing tests fine. Somebody throw up a suggestion!

check the spark. if it quits sparking, the ignition module could possibly be bad and heating up to the point of quitting...

I took a plug out and stuck a screwdriver in the wire and turned it over. It looked to me like it sparked good. Should i keep it revving to see if it quits and if it does quit it means the module is bad right.

Check the fuel pressure. Usually when the ignition control module goes bad it's completely gone, no 30 second start. Maybe the carb float is sticking or its valve is gummed up.

Mr.Deville if I check the fuel pressure while it is running; before it stops that should tell me whether its getting the 4-9 psi it needs to continue running?

just a quick thought maby an air leak

Mr.Deville if I check the fuel pressure while it is running; before it stops that should tell me whether its getting the 4-9 psi it needs to continue running?

Exactly. What carb is on there, quadrajet? And the in tank pump... it's leftover from when a 4100 was in there right?

When it dies, how long does it take to get started again?

cadillacdeville could also be onto something, check the vacuum lines for any brittle spots or cracks while you're at it.

Yes, it is the quadrajet and the pump was leftover from the 4100. And so far it will fire up immediately after it dies, just wont hold an idle without me stepping on the gas, and when i do it , it just stops abruptly. I tried to idle it up but to me it doesnt sound right and then it dies. The sun is up so now i will run all the air leak checks.

I would think that the 4100 fuel pump would have not enough flow and too high PSI for a carbureted car. I would use an electric fuel pump meant for a carburetor.
My guess is that the 500 is overloading the fuel pump or flooding the carb with too much pressure.

I am tired of fighting that pump. Does that mean I'll have to drop the tank and remove the in-tank pump? And the electric pump made for the carburetor should be wired to a wire that stays on when the ignition is switched on.

Yes, I would drop the tank, remove the EFI fuel pump, and get a pump meant for a carb. Even one of the stock mechanical pumps for the 500 would work fine, then all you have to do is run a line from the tank to the pump. If you are going to use an electric pump, yes you will need to hook it to a power that is only on with the ignition on.
On my 472 I have a Carter 72 GPH electric pump that is wired through the oil pressure switch. If the oil pressure drops too low, it shuts the ignition off so I won't destroy my engine. I also have a switch that bypasses that so when you start it, it won't be cranking until the oil pressure builds, it will have ignition immediately. Just a suggestion for a set-up for you. But to be simple, get a mechanical pump and run a line from the tank.

just snip the wire to the in-tank fuel pump and run a decent in-line electrical. Quick and easy...you'll hear a real quiet clicking when you first turn the key, but if its running you'll never be able to hear it, so its not a bad noise at all. I've done that on many failed fuel pumps...should work here too!

Hmm. Don't condemn the pump yet. Didnt the DFI use a low fuel pressure, something like 10 psi? A decent bypass regulator (uses the fuel return line on your car) should do the trick. Now if the pump is working is another story all together.

heres just a quick test to findout if its the pump put a mechanical pump back on the block the origonal if you got it or maby one from the junk yard run a line to a small container of gas see if it runs then you'll know.

Even if the pump is working ok, it will never had enough flow to feed a 500! That's twice the engine!