1984 Chevy K20 4X4 350 runs 20secs then dies

[2ringer6]

 

I have a 1984 Chevy K20 4X4 with a 350. It starts up runs for 20 seconds then dies. Starts right back up runs for 20 seconds then dies and so on. . Ignition module  is good, new pick up coil, HEI distributor is good.  There isn't a single fusible link on the firewall. There are three red wires coming of the positive lead on the batt. The fat one going to the starter and 2 smaller ones that go to the back side of the fuse block, but one of those has a 40 amp fuse about 1 foot from the batt. post. Any thoughts?

 

[Irish_Alley]

i would think its a fuel related problem see if you can keep it running on starting fluid or some sort of fluid. be careful if you use gas

[Kimper]

It definitely sound fuel related. Pull the air filter off and see if you can keep it running with a squirt bottle with fuel in it or starting fluid..That way you can at least eliminate one variable..