Ok so ive been trying to figure out what in the heck is wrong with my 89 gta 350 tpi for a few days now and im about to pull my hair out. When you turn the key forward it cranks over oil pressure builds but it doesnt start the lights, check engine,ect dont come on when the key is forward? just the seat belt and security light come on temporarily when you try to check codes by putting a jumper in the diagnostic port it does nothing at all. There is no fuel pressure but when you jump the top left terminal on the diagnostic port the fuel pump engages and pressurizes the rail but still no sign of starting it is getting spark however it seems the injectors arent fireing i just replaced the ecm about 2 months ago but a shop purchased it from a town 2 hours away so i dont want to try and exchange it if its not the problem. when it initially went out i still had lights on the dash and fuel pressure with key forward. any suggestions on what to do with this would be extremely helpfull. could this be a fusable link for the ecm if so where is it located all fuses in the fuse box are good. could this be something simpler a shorted wire in the ignition, my steering column is a little loose. whatever the problem is its not engaging the fuel pump or injectors but it does spark and crank over.

 

There is a 20 AMP in-line fuse near the battery. If it blows the fuel pump won't work. You will be able to crank it but you won't get any fuel. This fuse also sends battery power to the ECM..

 

Im having exactly the same problem... I do have good fuse and I have the power on the fuse. I have disconected ECM and theres also power on the connectors there. When I add 12v to the ALDL G connector fuel pump works.. There must be some kind of a gremlin becouse when I was towing my car home the SES light occasionaly blinked and I heard a fuel pump a couple of times..
When should I look for it? What wires etc..?