1983 911SC fuel pump issue

Quote:
Originally Posted by freelax View Post
Nick, I'm having fuel delivery issues and just tested my fuel pump on my 1983 911SC. I have replaced the pump within last year, but the multimeter shows about 8.96V across the terminals when motor is cranking. Battery shows 11.93-11.96V with no ignition switch activation... Is this be an indicator of not enough power to the pump?

Go to this tech article: Porsche 911 Fuel Pump Replacement | 911 1965-89 - 930 Turbo 1975-89 | Pelican Parts DIY Maintenance Article and post this comment at the bottom. Casey may have some input for you.

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This post was auto-generated based upon a question asked on our tech article page here: Porsche 911 Fuel Pump Replacement | 911 (1965-89) - 930 Turbo (1975-89) | Pelican Parts DIY Maintenance Article

[Casey at Pelican Parts]

You could perform a voltage drop test between the fuse and the pump + terminal. I think less than .4 volts would be ideal. You can also check the ground side the same way, but for the ground I would expect to see around .2 volts. Also check the voltage at the battery while cranking you may find that your battery while under load is dropping that low. Preferably the battery would read at least 10V while cranking.

- Casey

[darrin]

Sounds like your battery may be shot -- resting voltage on a healthy 12 volt car battery should be around 12.4 volts or more.

[Avanti]

Originally Posted by darrin

sounds like your battery may be shot -- resting voltage on a healthy 12 volt car battery should be around 12.4 volts or more.

+1 ^^^^