Jump to content
Forums Gone... but not forgotten!

Tired of these Ads? Register Today!

  • Welcome to Forever Pontiac

    Welcome to Forever Pontiac, full of great ideas for Pontiac performance, maintenance, or for peer-to-peer assistance from Professional and DIY mechanics. Also, compete in our Pontiac monthly competitions. Please register if you'd like to take part.

  • 0
Mark W.

fuel sending unit voltage


:wacko:what shoud the voltage be for fuel sending unit. For a 19777 grand prix  sj. With a fuel sending relay 

Share this post

Link to post
Share on other sites

1 answer to this question

Recommended Posts

  • 0


Sorry it took so long to answer your question. Actually, GM didn't use voltage between the fuel sending unit to the fuel gage. They relied on ohms (resistance) instead because electricity and fuel/fuel vapor are not good companions. GM used a reading of 0 - 90 ohms (zero ohms - empty - 90 ohms  full) from the mid-60s thru the 90s. Today's modern fuel level senders may go to 125 ohms, which shows the gate take a little past full. That's no big deal.

Share this post

Link to post
Share on other sites

Tired of these Ads? Register Today!

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now

Tired of these Ads? Purchase Enhanced Membership today to remove them!

Important Information

We have placed cookies on your device to help make this website better. You can adjust your cookie settings, otherwise we'll assume you're okay to continue.