I'm not sure if this one is set up like this, but newer Vortecs have a switch built in to the oil pressure sensor.... Generally an output from the ECM/PCM triggers the relay to 'prime' max pressure for starting, then switches to a secondary circuit running through the oil pressure sensor. Check to make sure the trigger signal from the ignition module or ECM, whichever it may be, is getting to the relay. If that checks out, check the oil pressure sensor and wiring... Hope that helps!

 

Check to insure ECM fuse(s) are not fried.

Uncle Bob

 

Well, the new fuel pump didn't change the status, so now it's on to the ignition control module and other electrical parts.

 

I have discovered that there is no current in the fuel injector connections, thus no fuel getting to the carb. I sprayed starter fluid in the carb and it acts like it's going to fire up. Everything else has checked out ok, so I'm thinking it's the ECU (brain). Possible?

 

You MUST have oil pressure while cranking, or no fuel... although I believe you should see an initial momentary pulse after first ignition.

Obviously, check all fuses first.. then on to the harder stuff.

If you are in a jam, you can actually supply 12v ignition power directly to the pump. A jumper in place of the relay could possibly do the trick.

 

Woohoo, got it running again! I ended up replacing the fuel pressure regulator, mainly because I needed the gasket for my old one, but had to buy everything else to get it. I figured it wouldn't hurt anything.

However, now I have another problem: When I turn on the lights, the engine dies! What in the world???