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Fuel Pump won't engage

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Old

Dec 4, 2010 | 09:42 PM

#1

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Fuel Pump won't engage

Hello everyone! New to ThirdGen.org; this is my first post, please forgive any errors. I beleive I have a wiring problem...
87 IROC, 305 TPI. Severe voltage drop to orange wire at fuel pump relay when ignition in run. Battery voltage good. 20 amp fuse by battery good. Voltage drop occurs with fuel pump relay, MAF relay and MAF power Relay unplugged. Can jump from positive battery terminal to Tan/White wire at fuel pump relay connector, pump engages. Any tips on tracing problem?

Old

Dec 4, 2010 | 11:55 PM

#2

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From: Not in Kansas anymore

Car: 82 Z28

Engine: 383 SP EFI/ 4150 TB

Transmission: T400

Axle/Gears: QP 9" 3.73

Re: Fuel Pump won't engage

Quote:

Originally Posted by Shadetree Mech

Severe voltage drop to orange wire at fuel pump relay when ignition in run.. Voltage drop occurs with fuel pump relay, MAF relay and MAF power Relay unplugged.

Voltage on orange at relay drops when key turned on only or is low all the time?

Old

Dec 5, 2010 | 08:57 AM

#3

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Re: Fuel Pump won't engage

Battery voltage 12.6, voltage at orange on fuel relay 9.4 with ignition off. 2.5 with ignition in run

Old

Dec 5, 2010 | 09:08 AM

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Re: Fuel Pump won't engage

Quote:

Originally Posted by vetteoz

Voltage on orange at relay drops when key turned on only or is low all the time?

Battery voltage 12.6, voltage on orange at fuel relay 9.6 with ignition off, drops to 2.4 when ignition in run

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