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Old 03-21-2016, 07:01 AM
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Why do you have the pump wire from the ECM going to a switch? It should go to the pump relay.

When you 1st turn the key on the ECM will pulse the fuel pump for a few seconds then stop. When the engine starts the ECM will control the fuel pump.
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Old 03-21-2016, 02:27 PM
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Originally Posted by Vega$69 View Post
Why do you have the pump wire from the ECM going to a switch? It should go to the pump relay.

When you 1st turn the key on the ECM will pulse the fuel pump for a few seconds then stop. When the engine starts the ECM will control the fuel pump.
Perhaps the switch is an anti-theft feature?
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Old 03-21-2016, 05:11 PM
vstol vstol is offline
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Here is the update. I have the Holley electric fuel pump. The directions for the ECM said to take the power supply wire for the fuel pump and attach it directly to the power wire on the pump. I have it going to a 40 amp switch. Right now there is no power going to the fuel pump wire. The little red light is on in the fuse relay panel but all the fuses are good. When I pull the ignition relay out the red light goes away and the MAF shutters for a second. When I try other relay's the same effect occurs. I have zero codes.

I have run power to the pump and it works. Thanks


https://lateral-g.net/forums/showthread.php4?t=44704
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Old 03-22-2016, 08:30 AM
vstol vstol is offline
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Looking for a life raft here, thanks. Its got to be simple
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Old 03-22-2016, 11:42 AM
dhutton dhutton is online now
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Looking for a life raft here, thanks. Its got to be simple
Post a schematic/diagram of what you have connected. Hard to follow otherwise.

Don
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Old 03-22-2016, 01:07 PM
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Looking for a life raft here, thanks. Its got to be simple
Key engine not running there will not be 12V to the fuel pump
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Old 03-22-2016, 01:59 PM
vstol vstol is offline
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Originally Posted by Vega$69 View Post
Key engine not running there will not be 12V to the fuel pump
So there will not be 12 volts there unless its running? I would think there would be a short 2 sec burst on the initial turn of the key?
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Old 03-22-2016, 02:21 PM
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So there will not be 12 volts there unless its running? I would think there would be a short 2 sec burst on the initial turn of the key?
yes short burst when key is 1st turned on
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