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> Fuel pump relay ?, Terminal 85 12 volts?
lexus914
post Sep 30 2018, 10:43 AM
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My 914 2litre fI was running fine. Let it sit for a couple months. Got in to start and no fuel pump running. Checked all the normal culprits . When I checked to see if I had ground on terminal 85 and voltage on terminal 86 on the relay board I got 11.89 volts on terminal 85 and 108.3 ohms resistance on terminal 86. WTF? Any body know where I should check next?
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74-914-1.8-Org-O...
post Sep 30 2018, 12:22 PM
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Not sure this applies to the 2.0 L engine, but here goes. My1.8 L requires the oil pressure sensor (switch to ground) to close for the fuel pump relay to get return to ground. This means you must have oil pressure before the fuel pump will run. I think your problem is over time you lost fuel pressure, not electrical failure.
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taylspin46
post Sep 30 2018, 12:34 PM
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QUOTE (lexus914 @ Sep 30 2018, 10:43 AM) *
My 914 2litre fI was running fine. Let it sit for a couple months. Got in to start and no fuel pump running. Checked all the normal culprits . When I checked to see if I had ground on terminal 85 and voltage on terminal 86 on the relay board I got 11.89 volts on terminal 85 and 108.3 ohms resistance on terminal 86. WTF? Any body know where I should check next?

Jumping relay terminal 30 to 87 should will energize pump. 30 is battery, 87 is consumer (pump).
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lexus914
post Sep 30 2018, 02:10 PM
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Thanks for input, I still am puzzled by the fact that I show 12 volts at terminal 85 and no volts at terminal 86. Something is causing that voltage to show up in the wrong place.
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taylspin46
post Sep 30 2018, 03:52 PM
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Term 85 is the relay coil power. Its voltage comes from power (main) relay term. 87 through the circuit board..
Pump relay term. 86 is ground side of coil.
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