Sending Unit question - The 1947 - Present Chevrolet & GMC Truck Message Board Network

DBear · 11-21-2010, 02:07 AM

I have a 69 K5 and I dropped the tank. I took the sending unit out and it was a little dirty. the strainer was gone, but I have another strainer to put on it. My question is this: What can I look for on the sending unit that would tell me it is bad or not. The truck was not running or wired up so I could not check it that way. I really dont wanna buy a new if possible.

Jacfourteen · 11-21-2010, 02:48 AM

You can use a multimeter set to the lowest value of ohms (continuity). You put one lead onto the terminal that the gauge wire goes to and the other lead to ground (any metal on the sender) and as you make the float move from empty to full you should see the ohm reading on the meter sweep from 0 to 90 ohms (or the other way, can't remember, but should read about 90 at one extreme and about 0 at the other). Hope this helps.

DBear · 11-21-2010, 02:47 PM

thank you....I am gonna try this

Jacfourteen · 11-21-2010, 04:02 PM

No problem, glad I could help you out!

11-21-2010, 02:07 AM	#1
DBear Registered User Join Date: Nov 2008 Location: Rowlett, TX Posts: 867	Sending Unit question I have a 69 K5 and I dropped the tank. I took the sending unit out and it was a little dirty. the strainer was gone, but I have another strainer to put on it. My question is this: What can I look for on the sending unit that would tell me it is bad or not. The truck was not running or wired up so I could not check it that way. I really dont wanna buy a new if possible.

11-21-2010, 02:48 AM	#2
Jacfourteen Big Red - Now its a SWB! Join Date: Jun 2009 Location: Oroville, Ca Posts: 1,624	Re: Sending Unit question You can use a multimeter set to the lowest value of ohms (continuity). You put one lead onto the terminal that the gauge wire goes to and the other lead to ground (any metal on the sender) and as you make the float move from empty to full you should see the ohm reading on the meter sweep from 0 to 90 ohms (or the other way, can't remember, but should read about 90 at one extreme and about 0 at the other). Hope this helps. __________________ 68 3/4 ton (Project)-350 Small Block, .030 over, 10:1 comp, 3998993 heads, C3BX edelbrock intake, comp cams XE268, Holley 670 SA, long tube headers, dual flow 40's, E-fan, Alum rad, currently under the knife getting shortened and bagged build thread 41 3/4 ton (wife's)-flatbed, fully restored to original 01 Tahoe LT 4WD (my daily driver)-Magnaflow Muffler, Rollin on 22's 02 Ford Mustang Convertable (Wife's Car)-Flowmaster 50, Clear corners, Intake, sittin on 18's

11-21-2010, 02:47 PM	#3
DBear Registered User Join Date: Nov 2008 Location: Rowlett, TX Posts: 867	Re: Sending Unit question thank you....I am gonna try this

11-21-2010, 04:02 PM	#4
Jacfourteen Big Red - Now its a SWB! Join Date: Jun 2009 Location: Oroville, Ca Posts: 1,624	Re: Sending Unit question No problem, glad I could help you out! __________________ 68 3/4 ton (Project)-350 Small Block, .030 over, 10:1 comp, 3998993 heads, C3BX edelbrock intake, comp cams XE268, Holley 670 SA, long tube headers, dual flow 40's, E-fan, Alum rad, currently under the knife getting shortened and bagged build thread 41 3/4 ton (wife's)-flatbed, fully restored to original 01 Tahoe LT 4WD (my daily driver)-Magnaflow Muffler, Rollin on 22's 02 Ford Mustang Convertable (Wife's Car)-Flowmaster 50, Clear corners, Intake, sittin on 18's

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