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Old 07-20-2010, 01:21 PM   #1
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Question 1986 P30 Fuel Pump voltage?

Had to replace the tank fuel pump in the 86 Elandan and checking for voltage at the connector and it was 8.2xx shouldn't it be 12v

Thanks To All

Fundalo Vega
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Old 07-20-2010, 07:01 PM   #2
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The voltage at the pump, at idle, should be close to the battery voltage. If you are measuring under load (pump running) at the pump 8.2 vdc sounds low. I would expect closer to the 11-12vdc range under load.
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Old 07-21-2010, 01:08 AM   #3
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Thanks Bigskymt for your reply,that voltage was taken without the pump installed,just key turned on.Keep those ideas coming
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Old 07-21-2010, 10:12 AM   #4
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The applied voltage to the in-tank fuel pump may come thru the oil pressure switch, which could have poor/dirty internal contacts - might verify to see if possibly the PSI sensor needs to be replaced, or perhaps the fuel pump plug at that sensor needs cleaning or other help...
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Old 07-21-2010, 12:29 PM   #5
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Just to illustrate my post above, here's where the operating voltage to the electric fuel pump in our '88 P30 Winnie is controlled (red and black wires) - just check the shown plug contacts for continuity and proper voltage at that point - it will reveal poor contact inside the oil pressure switch, or else eliminate that as a trouble source:

(click on image to enlarge)


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Old 07-21-2010, 02:12 PM   #6
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Thank You for the replies and I will check,and here is my thinking What if it only gives me 8 volts to prime the system then gives full voltage after the oil pressure comes up,I won't know until I finish the install. Thanks Again
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