Gas tank leak- What do I need? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Nova70 · 01-16-2011, 03:52 AM

My gas tank leaks when I fill it full. I'm not sure if I need a new gasket or what so was hoping someone could help me. It leaks where the tube goes into the sending unit hole. Hope that makes sense? The tube that runs the height of the tank and then through the floor. Is there a gasket to reseal in up or what? If I need to take a picture I can tomorrow. Thanks for the help.
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JimKshortstep4x4 · 01-16-2011, 06:55 AM

Is it leaking around the tube or is it leaking from the "O" ring that seals the sending unit to the tank?

Jim

cdowns · 01-16-2011, 07:34 AM

i'd remove the sending unint clean both areas really good install with a new Oring/// this is best done when the gastank is near empty

C10-Driver · 01-16-2011, 11:26 AM

It's probably leaking around the outlet tube. I had the same thing with one of my trucks... I thought it was a gasket but, after looking at it more closely, found there were little cracks in the welds around the tube. Get a new gasket and sending unit and replace them both. That what I did and never had another problem with it.

Nova70 · 01-16-2011, 12:08 PM

Quote:

Originally Posted by C10-Driver

It's probably leaking around the outlet tube. I had the same thing with one of my trucks... I thought it was a gasket but, after looking at it more closely, found there were little cracks in the welds around the tube. Get a new gasket and sending unit and replace them both. That what I did and never had another problem with it.

It's leaking around the outlet tube, not the sending unit. Guess I'll see how much a new sending unit is.

Edit- Thanks for the reply's guys.

C10-Driver · 01-16-2011, 09:33 PM

Quote:

Originally Posted by Nova70

It's leaking around the outlet tube, not the sending unit. Guess I'll see how much a new sending unit is.

Edit- Thanks for the reply's guys.

Are you talking about the fuel line that comes out of the tank? If so, check real closely where it is welded... That is where I had my problem. I initially thought it was a gasket but when I took the sending unit out, the gasket was fine. When you're taking it out, make sure you use a brass punch to get the collar off... They won't create any spark which could be a bad thing around your gas tank.

68gmsee · 01-16-2011, 09:50 PM

Sending units run about $30-$40. Check the local vendor site or google it.

Also, when removing and reinstalling the sending, use a brass drift. Harbor freight or local auto parts will carry them.

01-16-2011, 03:52 AM	#1
Nova70 Registered User Join Date: Jun 2009 Location: Dub VC Utah Posts: 364	Gas tank leak- What do I need? My gas tank leaks when I fill it full. I'm not sure if I need a new gasket or what so was hoping someone could help me. It leaks where the tube goes into the sending unit hole. Hope that makes sense? The tube that runs the height of the tank and then through the floor. Is there a gasket to reseal in up or what? If I need to take a picture I can tomorrow. Thanks for the help. Posted via Mobile Device __________________ '70 K10-- 4" lift on 35"s-- For Sale http://www.ksl.com/index.php?sid=733...iew&ad=4578305

01-16-2011, 06:55 AM	#2
JimKshortstep4x4 Senior Member Join Date: Jul 2001 Location: Muskegon,MI,USA Posts: 6,026	Re: Gas tank leak- What do I need? Is it leaking around the tube or is it leaking from the "O" ring that seals the sending unit to the tank? Jim __________________ 1971 Shortbox step side 4x4, 350 sbc, 3:07 rear end 1965 Impala SS 400 sbc, Muncie rock crusher 1966 Impala SS 396 bbc, TH 400 1969 El Camino, 350 sbc, TH 350 1971 Snowplow built on a Blazer frame 1972 GMC Short bed, stepside, TH 400, 427 BBC

01-16-2011, 07:34 AM	#3
cdowns Senior Member Join Date: Jan 2003 Location: daytonabeach Posts: 22,956	Re: Gas tank leak- What do I need? i'd remove the sending unint clean both areas really good install with a new Oring/// this is best done when the gastank is near empty __________________ 71c-10 350/2004r/4:11 lowered3/4 longbed/dead by hurricane MEANING OF DEATH::::: SOMEBODY ELSE GETS YOUR STUFF DONT BELIEVE EVERYTHING YOU THINK TAKE MY ADVISE;I DON'T USE IT ANYWAY

01-16-2011, 11:26 AM	#4
C10-Driver Chevy Truck Addict Join Date: Aug 2006 Location: Kelowna, BC Posts: 1,176	Re: Gas tank leak- What do I need? It's probably leaking around the outlet tube. I had the same thing with one of my trucks... I thought it was a gasket but, after looking at it more closely, found there were little cracks in the welds around the tube. Get a new gasket and sending unit and replace them both. That what I did and never had another problem with it. __________________ . 1970 Chev C/10 SWB, 355 SBC, 700R4, 3.73 Posi, Air Ride (Click to view Build Thread) (SOLD) 1978 Chevy C/10 SWB 1970 Pontiac Lemans .

01-16-2011, 09:50 PM	#7
68gmsee Active Member Join Date: Jul 2007 Location: Centrally located between Houston, Austin and Waco. BCS area. Posts: 7,947	Re: Gas tank leak- What do I need? Sending units run about $30-$40. Check the local vendor site or google it. Also, when removing and reinstalling the sending, use a brass drift. Harbor freight or local auto parts will carry them.

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