Fuel pump relay acting strange

[Hawkeye58]

Hi all,

I am trying to finish wiring up a 2.9 L I put in '84 BII. The 2.9 is from a '88 BII.
When I turn on the ignition I hear the ECM relay, and the fuel pump relay. But... the fuel pump relay shuts off after about 2-3 seconds. Any ideas on this? I thought it should stay on.
I just installed the relay as well. It seems the old one blew up, along with my fuel pumps. I get good continuity and power to the harness. Just get that odd behavior. I will be replacing the fuel pumps both on the rail and in the tank in a few days when I have the money. Any insight on this would be much appreciated. Thanks.

Hawkeye

 

[IMenriched]

Not sure of the relays, if in the "key on, engine off" (KOEO) mode, the FP will shut off after a few seconds...this is normal.

Suppose to stay running after the engine is running.

 

[shadetree]

Normal operation. The pump will start for a coupe of seconds at igniton on to prime the system, then it will shut off. When the computer sees ignition pulses when starting the engine, it will restart the pump.shady

 

[Hawkeye58]

Relays

Thanks for the info guys.

Hawkeye