fuel sender differences - The 1947 - Present Chevrolet & GMC Truck Message Board Network

tqlspec · 03-26-2010, 10:42 AM

Fuel sender units are listed as for manual or automatic transmission. What is the difference between these fuel senders? I'm trying to figure how the type of transmission is relevant. My '72 has automatic transmission. Can I use a manual transmission fuel sender?

thanks for your help.

northerngmc · 03-26-2010, 10:55 AM

Well I am curious as well.

When I was working on my 69 GMC I tried swapping out a fuel sending unit from another truck and found that the fuel line was a different size. The truck is was going into was a 3 on the tree and I can't remember which parts truck I attempted to take another off of as I have one automatic and one 4 speed manual.

Shyguy · 03-26-2010, 11:32 AM

I am not sure why there is a difference between the automatic and manual transmissions.

I know there is a difference in the 6 cylinder and V-8s because of need for differnent flow required.

I am sure some one else more knowledgeable than me wil chime in.
Danny

Longhorn Man · 03-26-2010, 11:24 PM

I have never heard of tranny making a differance.
5/16ths fuel line for inline and 2 bbl carb small blocks.
3/8 ths for all others including the GMC v6 motors

50mercfan · 03-26-2010, 11:41 PM

i am wondering the same thing. i ordered a new one from Southern Kentucky Classics they listed one for automatic and on for manual also.

northerngmc · 03-27-2010, 01:29 AM

It appears from the catalogs I have looked at that the manual vs auto is only for 1972.

**yote1234** · 03-30-2010, 04:47 PM

im interested as well....

**yote1234** · 03-30-2010, 06:23 PM

ahhhh. no 2nd line for canister?

jholley · 03-30-2010, 06:28 PM

The canister is a 72 only thing. That sender is a single year only unit. Don't know about the auto vs. manual though.

Shyguy · 03-30-2010, 07:26 PM

Hmmm, my '71, which seems to be stock, has a cannister just outside and under the battery tray.

So it makes me think that some '71s also had the closed system.

Danny

capev86 · 03-30-2010, 07:49 PM

darn.....i am putting a 4 barrel q-jet in my 72 burb 3/4 ton with the stock 307. i am hoping that i can get away with the 5/16 fuel line at least until i swap in my 406sbc which will suck a lot more air and gas.

jholley · 03-30-2010, 08:27 PM

Quote:

Originally Posted by Shyguy

Hmmm, my '71, which seems to be stock, has a cannister just outside and under the battery tray.

So it makes me think that some '71s also had the closed system.

Danny

Maybe it was a CA truck. Does the sender have two lines coming out of it? If so and you look up the part # it will be a 72 only

wreckedchevy · 06-30-2014, 01:13 AM

trying to find out what the difference is on the sender's why they are separate part for auto or man tranny and I found this old thread with no answer, anybody know the difference? I need to get a sender the truck is currently 4 speed but we are going to switch it to th350, thanks

03-26-2010, 10:42 AM	#1
tqlspec Registered User Join Date: Feb 2008 Location: Jackson, TN Posts: 99	fuel sender differences Fuel sender units are listed as for manual or automatic transmission. What is the difference between these fuel senders? I'm trying to figure how the type of transmission is relevant. My '72 has automatic transmission. Can I use a manual transmission fuel sender? thanks for your help.

03-26-2010, 10:55 AM	#2
northerngmc Registered User Join Date: Jan 2004 Location: Whitehorse YK Canada Posts: 2,651	Re: fuel sender differences Well I am curious as well. When I was working on my 69 GMC I tried swapping out a fuel sending unit from another truck and found that the fuel line was a different size. The truck is was going into was a 3 on the tree and I can't remember which parts truck I attempted to take another off of as I have one automatic and one 4 speed manual. __________________ Blaine 59 GMC 9314 a.k.a. Whoopee 68 C20 50th Anniversary a.k.a. The Rat http://www.flickr.com/photos/northerngmc/ http://www.members.tripod.com/P-wee/index_032.htm 1.61803 is one H of a lot better than 3.14159, no really it is!

03-26-2010, 11:32 AM	#3
Shyguy Junior Member Join Date: Dec 2006 Location: Southeast Missouri Posts: 2,436	Re: fuel sender differences I am not sure why there is a difference between the automatic and manual transmissions. I know there is a difference in the 6 cylinder and V-8s because of need for differnent flow required. I am sure some one else more knowledgeable than me wil chime in. Danny __________________ '67 Chevy C-20 short stepper - build complete, 454/SM-465. '75 C-30 Single Cab DRW-350 small block/NP-435. '77 GMC-6500 Dump Truck, 427 Tall Deck. '92 GMC K-3500 Duallie, 454/4L80E.

03-26-2010, 11:24 PM	#4
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,693	Re: fuel sender differences I have never heard of tranny making a differance. 5/16ths fuel line for inline and 2 bbl carb small blocks. 3/8 ths for all others including the GMC v6 motors

03-26-2010, 11:41 PM	#5
50mercfan Registered User Join Date: Feb 2006 Location: henderson ky Posts: 196	Re: fuel sender differences i am wondering the same thing. i ordered a new one from Southern Kentucky Classics they listed one for automatic and on for manual also.

03-27-2010, 01:29 AM	#6
northerngmc Registered User Join Date: Jan 2004 Location: Whitehorse YK Canada Posts: 2,651	Re: fuel sender differences It appears from the catalogs I have looked at that the manual vs auto is only for 1972. __________________ Blaine 59 GMC 9314 a.k.a. Whoopee 68 C20 50th Anniversary a.k.a. The Rat http://www.flickr.com/photos/northerngmc/ http://www.members.tripod.com/P-wee/index_032.htm 1.61803 is one H of a lot better than 3.14159, no really it is!

03-30-2010, 04:47 PM	#7
yote1234 Senior Member Join Date: Feb 2003 Location: Gold Canyon Arizona Posts: 4,330	Re: fuel sender differences im interested as well.... __________________ 1971 K5 CST Blazer 1965 Chevelle Malibu 283 (sadly sold) 1968 Camaro 327 1968 Honda mini-trail z50a #377 1966 uh 1-D Huey

03-30-2010, 06:23 PM	#8
yote1234 Senior Member Join Date: Feb 2003 Location: Gold Canyon Arizona Posts: 4,330	Re: fuel sender differences ahhhh. no 2nd line for canister? __________________ 1971 K5 CST Blazer 1965 Chevelle Malibu 283 (sadly sold) 1968 Camaro 327 1968 Honda mini-trail z50a #377 1966 uh 1-D Huey

03-30-2010, 06:28 PM	#9
jholley Registered User Join Date: Jul 2008 Location: TX Posts: 737	Re: fuel sender differences The canister is a 72 only thing. That sender is a single year only unit. Don't know about the auto vs. manual though. __________________ ------------------------------------------------- Jim Garage fillers... 85 Chevy C10 Silverado LWB 07 Nissan Altima 2006 Mini Cooper S

03-30-2010, 07:26 PM	#10
Shyguy Junior Member Join Date: Dec 2006 Location: Southeast Missouri Posts: 2,436	Re: fuel sender differences Hmmm, my '71, which seems to be stock, has a cannister just outside and under the battery tray. So it makes me think that some '71s also had the closed system. Danny __________________ '67 Chevy C-20 short stepper - build complete, 454/SM-465. '75 C-30 Single Cab DRW-350 small block/NP-435. '77 GMC-6500 Dump Truck, 427 Tall Deck. '92 GMC K-3500 Duallie, 454/4L80E.

03-30-2010, 07:49 PM	#11
capev86 Registered User Join Date: May 2009 Location: Eliot, Maine Posts: 1,314	Re: fuel sender differences darn.....i am putting a 4 barrel q-jet in my 72 burb 3/4 ton with the stock 307. i am hoping that i can get away with the 5/16 fuel line at least until i swap in my 406sbc which will suck a lot more air and gas.

06-30-2014, 01:13 AM	#13
wreckedchevy Registered User Join Date: Jun 2013 Location: billings, mt Posts: 703	Re: fuel sender differences trying to find out what the difference is on the sender's why they are separate part for auto or man tranny and I found this old thread with no answer, anybody know the difference? I need to get a sender the truck is currently 4 speed but we are going to switch it to th350, thanks __________________ 1969 Chevy C10 2wd stepside longbox



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