V8 or I6 Fuel Tank Sending Unit - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Legolas894 · 12-05-2009, 09:41 PM

I need to buy a new sending unit (the little resistance wire is fried). I know it's 90ohm but when I look in the LMC catalog, they have one for 2BBL and one for 4BBL. In Classic Trucks, they have one for 6 cyl and another for 8.

My truck had a six in it from the factory but has a 283 in it now with a quadrajet carb. Is it a fitting size thing? How can you tell which sending unit will work.

Thanks,

cdowns · 12-05-2009, 09:46 PM

6cyl outlets r 5/16 and 8cyl r 3/8

Longhorn Man · 12-05-2009, 10:03 PM

inline 6 is 5/16ths
2 bbl small blocks were 5/16ths
4 bbl small locks were 3/8ths
big blocks were 3/8ths
GMC only;
v6 trucks 3/8ths

Legolas894 · 12-05-2009, 10:28 PM

Ok-Forgive my ignorance but is it he size of the wrench that fits on the fitting or the size of the pipe?

Thanks a lot Cdowns and LH Man!

Blazer1970 · 12-06-2009, 07:46 AM

Quote:

Originally Posted by Legolas894

Ok-Forgive my ignorance but is it he size of the wrench that fits on the fitting or the size of the pipe?

Thanks a lot Cdowns and LH Man!

It is the size of the tubing that is used for the lines. The smaller 5/16" tubing has been known to starve a healthy V8 for fuel.

Legolas894 · 12-06-2009, 10:54 PM

Thanks-I should have known that answer but I always get confused with what "size" fittings, nuts, bolts, washers etc are. They almost never seem to be the size you could actually measure with a caliper or tape. I think it's even different between "tube" fitting and NPT! Probably a conspiracy to sell more parts and tools! In Canada, we all have to have both sets of wrenches (SAE and Metric).

BurnoutNova · 12-07-2009, 04:45 AM

Quote:

Originally Posted by Legolas894

In Canada, we all have to have both sets of wrenches (SAE and Metric).

Unfortunately thats the same way here in the U.S. The Snap-On and Mac guys that come to my work takes full advantage of that. I especially love when I have to buy SAE, Metric, 6 point, 12 point, E torx, regular torx, tamper proof torx, Hex drive, and Tripple square sockets. I wish it stopped there but thats not even it!

12-05-2009, 09:41 PM	#1
Legolas894 Chemist under the hood... Join Date: Apr 2009 Location: Fort Erie,ON, Canada Posts: 617	V8 or I6 Fuel Tank Sending Unit I need to buy a new sending unit (the little resistance wire is fried). I know it's 90ohm but when I look in the LMC catalog, they have one for 2BBL and one for 4BBL. In Classic Trucks, they have one for 6 cyl and another for 8. My truck had a six in it from the factory but has a 283 in it now with a quadrajet carb. Is it a fitting size thing? How can you tell which sending unit will work. Thanks, __________________ Current fleet: 2013 GMC Sierra, 5.3L, 4x4 1988 GMC Sierra, 305, Auto 1984 Jeep Grand Wagoneer, 360 V8 1997 VW Cabrio, 2.0L 2017 Toyota Rav4, 2.5L Stuff I wish I still had: 2013 Toyota Matrix [RIP] 1967 GMC 910 Fleetside, 283 V8 [1st Love-SOLD] 1987 Jeep Cherokee Laredo 4X4, 4.0 I-6 [SOLD} 1994 Chevrolet Caprice Classic, 5.7LV8 [SOLD] 1995 Chevrolet Astro AWD, 4.3L V6 (RIP) 1998 Chevrolet Suburban 4x4, 5.7L V8 [SOLD]

12-05-2009, 09:46 PM	#2
cdowns Senior Member Join Date: Jan 2003 Location: daytonabeach Posts: 22,956	Re: V8 or I6 Fuel Tank Sending Unit 6cyl outlets r 5/16 and 8cyl r 3/8 __________________ 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

12-05-2009, 10:03 PM	#3
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,690	Re: V8 or I6 Fuel Tank Sending Unit inline 6 is 5/16ths 2 bbl small blocks were 5/16ths 4 bbl small locks were 3/8ths big blocks were 3/8ths GMC only; v6 trucks 3/8ths

12-05-2009, 10:28 PM	#4
Legolas894 Chemist under the hood... Join Date: Apr 2009 Location: Fort Erie,ON, Canada Posts: 617	Re: V8 or I6 Fuel Tank Sending Unit Ok-Forgive my ignorance but is it he size of the wrench that fits on the fitting or the size of the pipe? Thanks a lot Cdowns and LH Man! __________________ Current fleet: 2013 GMC Sierra, 5.3L, 4x4 1988 GMC Sierra, 305, Auto 1984 Jeep Grand Wagoneer, 360 V8 1997 VW Cabrio, 2.0L 2017 Toyota Rav4, 2.5L Stuff I wish I still had: 2013 Toyota Matrix [RIP] 1967 GMC 910 Fleetside, 283 V8 [1st Love-SOLD] 1987 Jeep Cherokee Laredo 4X4, 4.0 I-6 [SOLD} 1994 Chevrolet Caprice Classic, 5.7LV8 [SOLD] 1995 Chevrolet Astro AWD, 4.3L V6 (RIP) 1998 Chevrolet Suburban 4x4, 5.7L V8 [SOLD]

12-06-2009, 10:54 PM	#6
Legolas894 Chemist under the hood... Join Date: Apr 2009 Location: Fort Erie,ON, Canada Posts: 617	Re: V8 or I6 Fuel Tank Sending Unit Thanks-I should have known that answer but I always get confused with what "size" fittings, nuts, bolts, washers etc are. They almost never seem to be the size you could actually measure with a caliper or tape. I think it's even different between "tube" fitting and NPT! Probably a conspiracy to sell more parts and tools! In Canada, we all have to have both sets of wrenches (SAE and Metric). __________________ Current fleet: 2013 GMC Sierra, 5.3L, 4x4 1988 GMC Sierra, 305, Auto 1984 Jeep Grand Wagoneer, 360 V8 1997 VW Cabrio, 2.0L 2017 Toyota Rav4, 2.5L Stuff I wish I still had: 2013 Toyota Matrix [RIP] 1967 GMC 910 Fleetside, 283 V8 [1st Love-SOLD] 1987 Jeep Cherokee Laredo 4X4, 4.0 I-6 [SOLD} 1994 Chevrolet Caprice Classic, 5.7LV8 [SOLD] 1995 Chevrolet Astro AWD, 4.3L V6 (RIP) 1998 Chevrolet Suburban 4x4, 5.7L V8 [SOLD]



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