Help! Wiring Schematic 82 xfire fuel pump relay

[Mikei16]

Hi, I am looking for the above, the blue wire looks like 12 or 10ga should that go to ground? I would like to see where all of the wires go on the relay. Thanks for any help.

Mike

PS: The old computer smells burnt, so I trying to tracy all of the wires before installing the new reman computer. Thanks Again

 

[wishuwerehere82]

Go to this link and register to be a member.

CrossFire Injection Forum

Then once you have a password, go to this page for a complete set of wiring diagrams.

http://www.crossfire.homeip.net/index.php?showtopic=617

You will see that there is a:

TAN/WHITE wire on A that goes to the Fuel Pump Fuse then to the Fuel pump, Oil Pressure Switch. and Pin 17 on ECM Connector C451 (+12V Relay Switched).

BLACK/WHITE wire on B that goes to Ground, and 2 pins (6 & 12) on the ECM Connector C451.

DARK GREEN/WHITE wire on C that goes to pin 18 on ECM connector C451. (Fuel Pump Relay Drive).

RED wire on D that goes to the Diagnostic Connector(under ash tray).

ORANGE wire on E that goes to the Battery, Oil Pressure Switch, Pins 10 and 15 on ECM connector C451 (+12V Battery).

So here's the order that things happen in the circuit:

!) Ignition switch is turned on. The ECM sends a signal to activate the fuel pump on Relay connection "C", with a return ground on "B". The relay closes output contacts "A and "E" which sends +12V to the fuel pump fuse, through it and to the Fuel Pump, and starts the fuel pump.
The fuel pump runs until the pressure comes up in the fuel system then shuts off. (Note:The fuel Pump shuts off by itself, not because the relay did. It has a pressure sensor in it and the relay is still on).

2) The "C" input will stay energized (Closing "A" and "E" contacts) while the engine is cranking until it starts.

3) Once the engine starts, the Oil Pressure Switch closes a set of contacts that short the "A" and "E" wires together, essentially bypassing the Fuel Pump Relay as long as the engine is running unless you experience a loss of oil pressure, or the ignition is turned off.

So the Fuel Pump Relay only works during the starting and cranking phase of the cycle. Once the engine has started, it turns off and the fuel pump is kept on by the Oil Pressure Switch (that black cylinder thing with the 3-wire connector on the engine block ) next to the distributor.

Hope this helps.

 

[Mikei16]

Thanks

Thanks for your help!!!!!!!!!! Where is the best place to get parts? Window switch-carpets-T-Top rubber? Thanks again for your help I got it running.
Mike

 

[TimAT]

Thanks for your help!!!!!!!!!! Where is the best place to get parts? Window switch-carpets-T-Top rubber? Thanks again for your help I got it running.
Mike

Those parts are just about everywhere. Any of the Corvette parts suppliers/vendors. I use The Last Detail in Atlanta quite a bit. I can walk in, (I'm in Atlaanta a lot) and they ship parts home for me no problem.

 

[wishuwerehere82]

Thanks for your help!!!!!!!!!! Where is the best place to get parts? Window switch-carpets-T-Top rubber? Thanks again for your help I got it running.
Mike

Come on down to Corvettes at Carlisle Aug 27-29.
The one stop shopping experience where you can find everything from anywhere.

 

[JohnGrawcock]

Thanks for your help!!!!!!!!!! Where is the best place to get parts? Window switch-carpets-T-Top rubber? Thanks again for your help I got it running.
Mike

Why not check out the supporting vendors. There are links to their web sights on the left side of your screen. You can look-up and order your parts online or just call and tell them what you need. Once you're on their mailing lists you'll have catalogs to browse.