Proper Fuel Sending Unit ? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

54blackhornet · 07-02-2023, 02:43 PM

Trying to locate the right unit for a 71 307 2 barrel carb ? Confused about oms range and line size ?

**Warrens69GMC** · 07-02-2023, 02:58 PM

307 had 5/16", or my 1969 does.

https://www.ebay.com/itm/35399746723...3ABFBM9Nmx_6Ji

replace brass float
https://www.ebay.com/itm/17396266899...Bk9SR_Djt_-iYg

**Rust_never_sleeps** · 07-02-2023, 04:17 PM

https://faq.speedhut.com/kb/fuel-lev...tance-o-ranges

You should be able to check your existing sender with a multimeter to confirm

**michael bustamante** · 07-02-2023, 08:59 PM

Supposed to be 90 ohm right?

RustyPile · 07-03-2023, 12:36 AM

All GM vehicles of this era use 90 ohm fuel sending units, configured to fit a specific vehicle.. Tubing size is referenced by its outer diameter.. Use this tool for taking that measurement. Can also be used for measuring lots of other stuff.. https://www.harborfreight.com/6-in-d...65fdb65f738212

Willie Makeit · 07-03-2023, 08:42 AM

90 Ohm & 5/16" line. I'm not 100% on this but I think in trucks of this era the 3/8" line was for used for big blocks only.

**Warrens69GMC** · 07-03-2023, 09:01 AM

Quote:

Originally Posted by Willie Makeit

90 Ohm & 5/16" line. I'm not 100% on this but I think in trucks of this era the 3/8" line was for used for big blocks only.

350's up had 3/8" lines

54blackhornet · 07-03-2023, 01:30 PM

Thanks guys for the information ! I will get one of those and measure the pipe to be certain.

07-02-2023, 02:43 PM	#1
54blackhornet Registered User Join Date: Jul 2008 Location: Eastern Oregon Posts: 2,416	Proper Fuel Sending Unit ? Trying to locate the right unit for a 71 307 2 barrel carb ? Confused about oms range and line size ? __________________ 71 C-20 07 Magnum RT AWD

07-02-2023, 02:58 PM	#2
Warrens69GMC Registered User Join Date: Jan 2003 Location: Safford,AZ Posts: 3,626	Re: Proper Fuel Sending Unit ? 307 had 5/16", or my 1969 does. https://www.ebay.com/itm/35399746723...3ABFBM9Nmx_6Ji replace brass float https://www.ebay.com/itm/17396266899...Bk9SR_Djt_-iYg __________________ 1969 307, t350 1950 Chevy Wagon 1978 Big 10 1967 C10, 250,3-OTT

07-02-2023, 04:17 PM	#3
Rust_never_sleeps Senior Member Join Date: Jun 2022 Location: San Ramon,CA Posts: 696	Re: Proper Fuel Sending Unit ? https://faq.speedhut.com/kb/fuel-lev...tance-o-ranges You should be able to check your existing sender with a multimeter to confirm

07-02-2023, 08:59 PM	#4
michael bustamante Senior Member Join Date: Sep 2007 Location: Albuquerque NM Posts: 7,878	Re: Proper Fuel Sending Unit ? Supposed to be 90 ohm right? __________________ 1967custom

07-03-2023, 12:36 AM	#5
RustyPile Registered User Join Date: Dec 2017 Location: Elkhart, Texas Posts: 1,882	Re: Proper Fuel Sending Unit ? All GM vehicles of this era use 90 ohm fuel sending units, configured to fit a specific vehicle.. Tubing size is referenced by its outer diameter.. Use this tool for taking that measurement. Can also be used for measuring lots of other stuff.. https://www.harborfreight.com/6-in-d...65fdb65f738212

07-03-2023, 08:42 AM	#6
Willie Makeit Registered User Join Date: Oct 2013 Location: Alabama Posts: 1,251	Re: Proper Fuel Sending Unit ? 90 Ohm & 5/16" line. I'm not 100% on this but I think in trucks of this era the 3/8" line was for used for big blocks only.

07-03-2023, 01:30 PM	#8
54blackhornet Registered User Join Date: Jul 2008 Location: Eastern Oregon Posts: 2,416	Re: Proper Fuel Sending Unit ? Thanks guys for the information ! I will get one of those and measure the pipe to be certain. __________________ 71 C-20 07 Magnum RT AWD



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