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1986 vette, no power to fuel pump relay,

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Old 06-16-2007, 12:44 PM   #1
Baksu
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Default 1986 vette, no power to fuel pump relay,

just bought an 86 vette basket case, I bought it for the drive line, their is no power at the fuel pump relay, fuses ar good, but there are 2 wires spliced at the computer, can anyone helpout with a wiring diagram, with out having to buy a complete manual, any help thanks Mark
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Old 06-16-2007, 03:01 PM   #2
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Which wires? What color? What pins? Relay coil or relay contact power? If you want good help, you have to supply good information.
The fuel pump relay is powered by two places, one from the ECM (grn/wh), supplies +12v to the relay coil for 2 seconds when you turn on the ignition. The second supplies +12v to the relay contacts (orange).
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Old 06-16-2007, 03:02 PM   #3
bogus
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Mark -

Trying to fix electrical gremlins on a C4 without the aide of the Helm Factory Service Manual is damned near impossible.

Do yourself a favour - unass $100 and buy the ****ing manual.
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Old 06-16-2007, 05:32 PM   #4
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Quote:
Originally Posted by jfb
The fuel pump relay is powered by two places, one from the ECM (grn/wh), supplies +12v to the relay coil for 2 seconds when you turn on the ignition.
And also when cranking and running.

Baksu, When are you checking for power at the relay? On what relay terminals.

RACE ON!!!
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Old 06-16-2007, 05:34 PM   #5
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Not to sound dumb, but are you checking the right relay? On 4+3 cars the fuel pump relay is right behind the overdrive relay, and is the exact same p/n.
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Old 06-16-2007, 08:37 PM   #6
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http://members.shaw.ca/agent86/Fuel%...elivery-8A.pdf
http://members.shaw.ca/corvette86/En...agram%2086.pdf
http://members.shaw.ca/corvette86/Fu...mDiagnosis.pdf
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