modern gas tank floater assembly with old dashboard? - Hot Rod Forum : Hotrodders Bulletin Board
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Old 11-25-2009, 09:01 PM
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modern gas tank floater assembly with old dashboard?

When putting EFI in my '57 Chevy Suburban, I want to use the complete in-tank fuel pump/pick-up/floater assembly from a late '80s truck (the same that supplied some EFI parts) in my stock tank. I know I will have to modify a bit!
My question is whether the '80s floater part in the tank will work with the '57 gas gauge in the dashboard? They may not require the same resistance...
If they would not work together for electrical reasons, how can fix this, how can I modify to make them work?
I want to do this because I like to have more modern parts when I can for ease of maintenance/reliability.
Thanks!

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Last edited by wave1957; 11-25-2009 at 09:02 PM. Reason: typo
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Old 11-25-2009, 09:26 PM
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They need to be of the same resistance, The oold guage is probably 30 ohms. You will have to modift the tank resistor to match if it does not measure the same as the gauge.
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Old 11-26-2009, 07:05 PM
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Anyone knows the resistance of the late '80s truck floater assembly and if they are not the same resistance, is there a way to "correct" the resistance, something to mount between tank and gauge, maybe?
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Old 11-28-2009, 10:57 AM
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"GM Fuel sending unit conversion 30 ohm" is a post by Eric64 that docvette answered in 2007.

I'm a computer doofus, so I can't do the hyperlink thing— if you do, tell me how! Look up that post and you'll be educated. Cheers!

Last edited by marzini; 11-28-2009 at 11:10 AM. Reason: oopsed the date
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Old 11-28-2009, 03:04 PM
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Here's a link to that post.
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Old 12-03-2009, 02:24 PM
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i thought gm was 0 to 90 ohms range
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Old 12-03-2009, 02:37 PM
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Quote:
Originally Posted by fast68
i thought gm was 0 to 90 ohms range
new is 90, old is 30.

good catch marzini.
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