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Registered
Join Date: Jun 2004
Location: Rio Rancho, New Mexico
Posts: 1,325
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At the fuel pump relay 86 is 12 volts when the ignition is on.
85 is ground only when the air sensor plate is lifted.
With the ignition on, jumper 85 to a good known ground.
If the pump runs, the trouble is in the switch or wiring from the air sensor.
While the ignition is on, 86 should read 12 volts, if not chase that wire.
86 is the positive side of the fuel pump relay coil and 85 is the ground side of the coil.
Since you can make the pump run by jumping 87a and 30, I'm betting the problem is at 85 through the air sensor switch to ground.
Edit.
Ignore this: I have a better troubleshooting guide later into this post, 2.7Racer
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DOUG
'76 911S 2.7, webers, solex cams, JE pistons, '74 exhaust, 23 & 28 torsion bars, 930 calipers & rotors, Hoosiers on 8's & 9's.
'85 911 Carrera, stock, just painted, Orient Red
Last edited by 2.7RACER; 10-05-2006 at 10:33 PM..
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