Car fires up and runs for a second or two...then stops.
Attach fp gauge and see no fuel pressure.
Turn key on and off and no "clicking" from f.p. relay.
Change relay for new and same...no pressure.
Run a lead from battery +ve to term. G and fuel pump cranks right up and have close to 40psi on the gauge.
Turn ig. on and relay "clicks" and eng. fires up and runs fine...
Attempt to start car next day...same thing. Can only get fp by running power direct to term G. Once it starts up and runs, turn ig. off and then attempt to start, it fires up every time.
Can only get cold eng. running after standing by "exciting" fp first...
Any help would be appreciated...

 

Sounds like your pump may be on it's way out. I say that because it seems that 2 seconds of power, isn't enough to fire up the pump, but continuous power (from ALDL), will.
Continuous cranking should also allow continuous power to pump, via the oil pressure switch. Do you crank it for extended periods of time, or give up if it doesn't fire up immediately ?
Here is the 89 schematic, that and a DMM/test light, should help narrow down where the problem is.

 

Re-reading your post, I see you hear no clicking from relay, when first attempting start. A test light on terminal "D" of pump relay, should light up for 2 seconds when cranking. That being said, there is a timer, so you can't repeat key on/off and expect to see 12v at "D", every time.

 

Thx for your interest...I have tried "extended" cranking, like 5 secs or so and it won't get fuel pressure...
I have some schematics and looking at them is what prompted me to come here...too many components linked to the fuel pump circut...Maf relay, vats, ecm, fuse, fusible link, oil pressure switch...
I'll try longer extended cranking tomorrow and see what happens....
If the pump was going south, why is the relay not clicking in..?
After the initial link to the aldl connector, it works fine....I have been trying it out tonite maybe a dozen times and it is all working as it should...this "cold" sympton has me beat.

 

Are you sure the relay is not "clicking in" ?
Use a test light and test the circuits, the answer will come.

 

Oil pressure switch, on the motor.

The ECM powers the FP relay for that 2 sec (or so) when the key is turned on, and that's the Only time. This will reset, BTW, after about 5 seconds of key off, you can usually hear the "click" sound from the ECM after you turn the key off, if you are quiet enough.

The Other way the FP is powered, the way it stays on while the motor is running, is through the oil pressure switch. At the back of the motor, on the tee fitting along with the sender for the oil pressure gage. The switch is the one with Two wires on it.

Oil pressure above whatever (15 psi?) closes the switch, powering the pump. Directly to the pump. This power feed to the pump does NOT go through the relay, but can be checked by probing the red wire (terminal A) at the relay, the same terminal that goes to the Pump (thru the fuse) and also tee's back to ECM terminal C2 (telling the ECM that the pump has power).

Try jumpering the two wires at the oil pressure switch connector, the fuel pump should run, doesn't matter where the ign. key is (note that the Relay won't pull in..). The switch gets It's power directly (unfused) from fusible link H, BTW, always hot. The fusible link has to be OK..

Since the oil pressure switch carries full current for the fuel pump (powers the pump directly, not thru a relay) the contacts in the switch are pretty heavy duty. They still will eventually fail, however. This can happen as an intermittent. When it won't stay running again, check the switch First or jumper it. I'll bet that's your problem.

 

'89 has both combined in one 3 wire unit. Red and Org are the pump wires

 

You are correct in that the oil press switch provides power to the pump with oil press (app 4 psi). However, the ECM triggers the fuel pump relay when it senses ignition pulses. The oil press switch provides a parallel secondary source of power to the fuel pump.

Emphasis on secondary.