I am not a pro mechanic, I started on this project z ‘75 280z fuel injected. I changed all the gaskets and realized I needed new fuel injectors. I pulled them and changed them. I didnt relieve the pressure by disconnecting the line and letting the pump pump it out. I leaked some fuel and relieved the pressure that way. I replaced everything and put the car back together when i went to turn it on it wouldnt turn on. 
It cranks and if i give it gas it tries to turn on but wont stay on. I think i have spark. When i have the key in the on position i can hear the fuel pump working. My gas tank currently has under a quarter of gas. And before i change all the spark plugs and wires how can i make sure if its the gas pressure or if it isnt getting enough gas. I changed the fuel filter too. What should i do to run diagnostics? Thank you!

1 hour ago, Spikzsta said:

I started on this project z ‘75 280z fuel injected.

It cranks and if i give it gas it tries to turn on but wont stay on. I think i have spark. 

Did it run when you started the project?

Try starting fluid.

Make sure that the intake manifold and crankcase are fully sealed.  All of the injector o-rings, the oil filler cap, all ports on the manifold must have a hose or be blocked.  Even the dip stick tube has to be sealed.

1 hour ago, Zed Head said:

Did it run when you started the project?

Try starting fluid.

Make sure that the intake manifold and crankcase are fully sealed.  All of the injector o-rings, the oil filler cap, all ports on the manifold must have a hose or be blocked.  Even the dip stick tube has to be sealed.

It ran. I will try starting fluid. Im sure everything is sealed but ill double check.

Also check wire connections to pump, injectors and ignition

Sent from my [device_name] using http://Classic Zcar Club mobile

1 hour ago, ajmcforester said:

Also check wire connections to pump, injectors and ignition

Sent from my [device_name] using http://Classic Zcar Club mobile
 

I havent gotten a chance to work on it but... i did an egr delete would that have anything to do i disconnected a wire im guessing it was to a water temp gauge could that be giving me an error? All the pipes were sealed and headers installed 

I havent gotten a chance to work on it but... i did an egr delete would that have anything to do i disconnected a wire im guessing it was to a water temp gauge could that be giving me an error? All the pipes were sealed and headers installed 

Not what I'm thinking old cars sometimes a wire connections don't always connect after disconnecting.

Sent from my [device_name] using http://Classic Zcar Club mobile

Did you plug the one under the throttle body that comes off the EGR or BPT, I can't remember which but it's the one circled in yellow in this photo.

Here's a good picture of the connections on a "77.  Thanks to @240260280

His write up,

http://atlanticz.ca/zclub/techtips/electricalconnections/index.html

Edited August 12, 20186 yr by siteunseen

I just took the EFI harness off my 77 and there is also a ground in the engine compartment the drivers side strut  bulge. I missed this one in the drawing above.

On 8/12/2018 at 4:27 AM, siteunseen said:

Did you plug the one under the throttle body that comes off the EGR or BPT, I can't remember which but it's the one circled in yellow in this photo.

Here's a good picture of the connections on a "77.  Thanks to @240260280

His write up,

http://atlanticz.ca/zclub/techtips/electricalconnections/index.html

I plugged upthe one for the egr. I gotta check the wiring again i will be changing the spark plugs and wires anyway

On 8/12/2018 at 4:05 AM, ajmcforester said:

Not what I'm thinking old cars sometimes a wire connections don't always connect after disconnecting.

Sent from my [device_name] using http://Classic Zcar Club mobile
 

The temp and thermostat sensors were in a plug together with the egr. Ill try pluging that in maybe thats why it isn’t starting?

3 minutes ago, Spikzsta said:

The temp and thermostat sensors were in a plug together with the egr

Can you post pics of what you are talking about, I'm not following you.

On 8/10/2018 at 2:11 PM, Spikzsta said:

I changed all the gaskets

And are you referring to the injector seals?