gas tank sending unit

dynamic88 · 11-07-2006, 07:16 PM

what is a gas tank sending unit and what is its purpose. i asume that it is what sends gas up to the carb, but i dont know for sure.

Oldsmaniac · 11-08-2006, 05:02 AM

The sender is in the tank and consists of a float and a potentiometer. As the gas level increases or decreases the voltage to the dash unit changes and gives the level.

dynamic88 · 11-08-2006, 04:24 PM

ok thanks. so how do you know if you need a new one or not. would it be if your gas gauge doesnt work?

and1stp · 11-08-2006, 05:07 PM

It could be the sending unit, gauge or a wiring issue. I would start with making sure all of the connections/wires are good and connected. Then from there testing the guage and or sending unit.

bjtstarfire · 11-25-2006, 03:17 AM

If your going to check the sending unit (i.e. its removed from the tank) look for approx. zero to 3 ohms in the empty position and somewhere between 150to 165 ohms from empty to full.

FYI

Yellow terminal is the empty and gray terminal is full.

You can find the same two wires under the dash to check continuity. That gest you past the tank connection, body connection, and instrument connector.

The guage is more complicated of a test.

Remove battery prior to testing any of this stuff.

dynamic88 · 11-26-2006, 01:54 PM

Okay Thans For The Info

super88dan · 12-05-2006, 07:45 PM

I just went through all that. I have a 1960 super 88. Fusick had the best price for sending units. The problem I had was the "sock" filter...
I bought mine through a chevy supplier. http://www.lategreatchevy.com/produc...dept%5Fid=1272
The sending unit is on top of your gas tank. I wasn't getting a reading on my fuel gauge so, I got the sending unit. (USA Auto Parts0 for $129.00) Fusick had the same unit for $69.00!
I dropped the tank (9 gallons of gas, premium still in it) took it to a shop to have it blasted, some shops still can do the "renue" process, they did something callled rattling, a process of shaking beads around to dislodge the chuncks of varnish, etc. Then, the spray an inhibitor.
At Late Great Chevy, be sure to check your size. 5/16 or 3/8
good luck.

11-07-2006, 07:16 PM	#1 (permalink)
dynamic88 Senior Member Join Date: Oct 2006 Posts: 139	gas tank sending unit what is a gas tank sending unit and what is its purpose. i asume that it is what sends gas up to the carb, but i dont know for sure.

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11-08-2006, 05:02 AM	#2 (permalink)
Oldsmaniac Senior Member Join Date: Oct 2005 Location: NJ Posts: 350	The sender is in the tank and consists of a float and a potentiometer. As the gas level increases or decreases the voltage to the dash unit changes and gives the level.

11-08-2006, 04:24 PM	#3 (permalink)
dynamic88 Senior Member Join Date: Oct 2006 Posts: 139	ok thanks. so how do you know if you need a new one or not. would it be if your gas gauge doesnt work?

11-08-2006, 05:07 PM	#4 (permalink)
and1stp Member Join Date: Aug 2006 Posts: 44	It could be the sending unit, gauge or a wiring issue. I would start with making sure all of the connections/wires are good and connected. Then from there testing the guage and or sending unit.

11-25-2006, 03:17 AM	#5 (permalink)
bjtstarfire Member Join Date: Nov 2006 Location: Greater Philadelphia, PA area Posts: 64	If your going to check the sending unit (i.e. its removed from the tank) look for approx. zero to 3 ohms in the empty position and somewhere between 150to 165 ohms from empty to full. FYI Yellow terminal is the empty and gray terminal is full. You can find the same two wires under the dash to check continuity. That gest you past the tank connection, body connection, and instrument connector. The guage is more complicated of a test. Remove battery prior to testing any of this stuff.

11-26-2006, 01:54 PM	#6 (permalink)
dynamic88 Senior Member Join Date: Oct 2006 Posts: 139	Okay Thans For The Info

12-05-2006, 07:45 PM	#7 (permalink)
super88dan Junior Member Join Date: Dec 2006 Location: Milwaukee WI Posts: 5	I just went through all that. I have a 1960 super 88. Fusick had the best price for sending units. The problem I had was the "sock" filter... I bought mine through a chevy supplier. http://www.lategreatchevy.com/produc...dept%5Fid=1272 The sending unit is on top of your gas tank. I wasn't getting a reading on my fuel gauge so, I got the sending unit. (USA Auto Parts0 for $129.00) Fusick had the same unit for $69.00! I dropped the tank (9 gallons of gas, premium still in it) took it to a shop to have it blasted, some shops still can do the "renue" process, they did something callled rattling, a process of shaking beads around to dislodge the chuncks of varnish, etc. Then, the spray an inhibitor. At Late Great Chevy, be sure to check your size. 5/16 or 3/8 good luck.