Fuel pump wire from ECM

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Nov 29, 2017 | 07:03 AM

Ian67

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Intermediate

Joined: Mar 2017

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Fuel pump wire from ECM

I hope some one can help me with the fuel pump wiring. I have a 92 LT1 and I'm trying to find the wire that is switched by the ECM to operate the fuel pump.

Nov 29, 2017 | 09:03 AM

Kevova

Le Mans Master

Joined: Sep 2013

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From: near the thumb in the mitten

Grey wire runs from FP1 fuse to pump.
Red wire runs from oil pressure switch and fuel pump relay (30) to FP1 fuse.
Red wire at (87) of relay receives 12v from Fuel Pump fuse.
(86) Dark Green wire at relay comes from ecm D7 to turn on relay.
Black and White wire at relay (85) is ground. Fuel pump relay terminals are 87a 87,30,86,& 85.

Nov 29, 2017 | 09:28 AM

Ian67

Thread Starter

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Quote:

Originally Posted by Kevova

Thanks for the explanation on the relay numbers, it really helps. These are the colors at my relay; Black & Orange at 87, Dark Brown & White at 87A, Black & Orange at 86, Black at 85 and 2 red at 30. I'm glad that I understand these relays, other wise that wiring would have got me confused.

Last edited by Ian67; Nov 29, 2017 at 09:45 AM.

Nov 29, 2017 | 05:37 PM

playsdixie

Drifting

Joined: Jun 2013

Posts: 1,590

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From: ft myers FL/Munising MI

Quote:

Originally Posted by Kevova

you sound very knowledgeable....perhaps you can help me with my fuel pump wiring....on my 85 I can apply 12 volts to pin A on the relay to bypass everything...can't get the pump on...bench tested it, it's fine..I can get 12 volts at the fuse from pin A but if I restore the relay, no voltage at the fuse box....pump does not come on in either situation....