10-20-2022, 08:38 PM | #1 |
Drives: 1966 Chevelle Join Date: Oct 2013
Location: Northern California
Posts: 141
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Not getting 12 volts to F. Pump relay
2013 LFX in my 66 Chevelle.
When I turn my key to the on position, I’m only getting 2.5 volts to the 86 terminal on my fuel pump relay. I have 12 volts at 87 and the pump is connected to 30. This is a new problem out of the blue. Any thoughts?? Fuel pump runs fine if I jumper to it. Fuse is good and I changed it just to be safe.
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66 Chevelle with 2013 LFX V6, 6 speed auto, full Hotchkis suspension, Wilwood 4 wheel discs.
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10-21-2022, 08:19 AM | #2 |
Drives: 2010 Camaro SS2,L99, LSA SC Join Date: Aug 2017
Location: Huntsville, AL
Posts: 2,280
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Is this controlled by PWM? If not, have you confirmed whether the relay is controlled by a power signal or a ground.
Assuming its supposed to have 12v on that terminal, you are going to have to work your way up the chain to see where the voltage drops off. Do you have the wiring diagram for this circuit? |
10-21-2022, 11:56 PM | #3 |
Drives: 1966 Chevelle Join Date: Oct 2013
Location: Northern California
Posts: 141
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It is not PWM. It should be straight 12v and I believe the signal is coming from the ECM. I’m tracing back now but was just wondering anyone else had had this issue.
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66 Chevelle with 2013 LFX V6, 6 speed auto, full Hotchkis suspension, Wilwood 4 wheel discs.
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10-28-2022, 08:09 PM | #4 |
Drives: 1966 Chevelle Join Date: Oct 2013
Location: Northern California
Posts: 141
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The wire is green/white strip and originates at the K20 X1 connector, terminal 44. It is supposed to be 12v as far as I can tell (circuit 465).
Everything had been working fine up until now? Any clues?
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66 Chevelle with 2013 LFX V6, 6 speed auto, full Hotchkis suspension, Wilwood 4 wheel discs.
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10-29-2022, 09:52 AM | #5 |
Drives: 2010 Camaro SS2,L99, LSA SC Join Date: Aug 2017
Location: Huntsville, AL
Posts: 2,280
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The only diagrams I have access to are the 2010 models and that pin is not used on the v8 and is a low reference on the LLT. What is the description for that pin in the service manual?
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