Fuel Sending Unit..Which One? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

5150 · 02-07-2006, 05:26 PM

Pulled my Sending Unit out today and trying to figure out which one to purchase. I have a thread on the parts board about purchasing one I just want to get the right one. My truck is originally a V6 truck but now has a late 70's V8 in it. I wouldn't mind changing to a V8 sending Unit I just want to know what's all involved and I guess I'll decide then whether it's worth it.

Can I get some pros and cons of swapping to the V8 sending unit?

By the last pic you can tell what's wrong with mine.

*1969owner* · 02-07-2006, 05:31 PM

i need to pay attention to this thread, i need one also.....

70c10 · 02-07-2006, 05:39 PM

It probably won't matter if you are not looking for every ounce of performance on your top end. You can buy a piece of steel brake line to attach to the sending unit for a few dollars and bend it (with a tubing bender) to match the old line and replace the rest of the line from the cab to the carb. You have a nice truck and I would personally do it. If you are just cruising around in your truck you won't notice the 5/16 line you currently have.

Longhorn Man · 02-07-2006, 07:30 PM

If your truck came with a V-6 originally, then it'll already have the 3/8 fuel line.

**pjmoreland** · 02-07-2006, 09:59 PM

Quote:

Originally Posted by Longhorn Man

If your truck came with a V-6 originally, then it'll already have the 3/8 fuel line.

So do V-6 trucks have a 3/8 line and inline-6 trucks have 5/16 line?

RicksTrucks · 02-07-2006, 08:16 PM

I ordered a V8 sending unit for my son's 68 short stepside. The connector was larger than fuel line. Called the vendor and he said it must have been a 6 cylinder truck, so I ordered the 6 cylinder sending unit and it worked perfectly. While I was waiting I rigged up a reducer between the sending unit and the fuel line going thru the floor of the cab.

5150 · 02-07-2006, 11:05 PM

I have a local vendor about 10 minutes from my house. I called him to see if he had a used one and for how much. Turns out he has a V6 sending unit NEW for $35, so I'm going down in the next couple of days to get it.

Thanks guys,

Bryan

Longhorn Man · 02-07-2006, 11:19 PM

That is correct,
2 bbl small blocks, and inline trucks have 5/16 fuel line.
4 bbl small blocks, and v-6 have 3/8 fuel line.

I do not know about the few 2 bbl big blocks, no clue on them, but I would guess that all big block trucks got 3/8.

The only thing I am confused about here... yellow 69 has a chevy... not a GMC. Only GMC trucks had the V-6.
What's your vin read? Is it a CExxxxxx, a CSxxxxxxx or a CMxxxxxxx?

5150 · 02-08-2006, 03:45 PM

My VIN is: CS140A135104

KFreddy · 02-08-2006, 04:00 PM

Not wanted to hijack this thread. I have replaced my sender twice yet my fuel gauge doesn't move at all. It just sits at the halfway mark full or empty. When I have the sender out of the tank and move it manually the gauge works fine, however installed in the tank it's a no go... Any thoughts or suggestions?

Thank you,

-Fred
"The Great State of Florida"

dubya · 02-08-2006, 04:41 PM

Quote:

Originally Posted by KFreddy

Not wanted to hijack this thread. I have replaced my sender twice yet my fuel gauge doesn't move at all. It just sits at the halfway mark full or empty. When I have the sender out of the tank and move it manually the gauge works fine, however installed in the tank it's a no go... Any thoughts or suggestions?

Thank you,

-Fred
"The Great State of Florida"

Check that the tank is grounded, and that the flaot actually floats and not fills up with fuel and sinks.

Longhorn Man · 02-08-2006, 05:54 PM

Your truck came with an inline 6... a 250 or a 292...not a v 6.

5150 · 02-08-2006, 06:31 PM

I pretty much meant a 6 cylinder motor of some sort.

**Palf70Step** · 02-08-2006, 07:27 PM

Go with the V8/V6 one...redo your lines to 3/8. You'll not regret it.

02-07-2006, 05:26 PM	#1
5150 C10 Club Tennessee Join Date: Mar 2003 Location: White House, TN 37188 Posts: 8,281	Fuel Sending Unit..Which One? Pulled my Sending Unit out today and trying to figure out which one to purchase. I have a thread on the parts board about purchasing one I just want to get the right one. My truck is originally a V6 truck but now has a late 70's V8 in it. I wouldn't mind changing to a V8 sending Unit I just want to know what's all involved and I guess I'll decide then whether it's worth it. Can I get some pros and cons of swapping to the V8 sending unit? By the last pic you can tell what's wrong with mine. Attached Images __________________ Bryan www.gmtruckshow.com Project "Andes"-Halen's First Truck Project: Patina Burb for he is God’s servant for your good. But if you do wrong, be afraid, for he does not bear the sword in vain. For he is the servant of God, an avenger who carries out God’s wrath on the wrongdoer. Romans 13:4

02-07-2006, 05:31 PM	#2
1969owner Account Suspended Join Date: Dec 2005 Location: martin georgia Posts: 568	Re: Fuel Sending Unit..Which One? i need to pay attention to this thread, i need one also.....

02-07-2006, 05:39 PM	#3
70c10 67-72 Addict! Join Date: Feb 2002 Location: The TAX State! Posts: 7,856	Re: Fuel Sending Unit..Which One? It probably won't matter if you are not looking for every ounce of performance on your top end. You can buy a piece of steel brake line to attach to the sending unit for a few dollars and bend it (with a tubing bender) to match the old line and replace the rest of the line from the cab to the carb. You have a nice truck and I would personally do it. If you are just cruising around in your truck you won't notice the 5/16 line you currently have. __________________ Jim 1970 C/10 Fleetside w/Ghost Flames Lowered 4.5" front and 4" rear (Raked) 355/350 Turbo w/shift kit 10" Redneck Performance Verter w/2500 stall Hooker Super Comps part#2808-1 Performer RPM Air-Gap 12 Bolt w/3:73 gears- Eaton Posi Comp Cams XE262 with 1.6 Crane Energizers, Road Demon 625 and Brodix IK 180 heads Last edited by 70c10; 02-07-2006 at 05:41 PM.

02-07-2006, 07:30 PM	#4
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,690	Re: Fuel Sending Unit..Which One? If your truck came with a V-6 originally, then it'll already have the 3/8 fuel line.

02-07-2006, 08:16 PM	#6
RicksTrucks Senior Member Join Date: Jan 2005 Location: Claremore, OK 74017 Posts: 2,639	Re: Fuel Sending Unit..Which One? I ordered a V8 sending unit for my son's 68 short stepside. The connector was larger than fuel line. Called the vendor and he said it must have been a 6 cylinder truck, so I ordered the 6 cylinder sending unit and it worked perfectly. While I was waiting I rigged up a reducer between the sending unit and the fuel line going thru the floor of the cab. __________________ 68 Short Stepside C-10 69 SWB C-10 70 Flatbed C-20 70 LWB C-20 BB402 70 LWB C-10 CST 70 LWB C-10 CST 71 Short Stepside Cheyenne C-10 72 LWB C-10 72 Blazer 4x4 4spd 95 Jeep Cherokee 4x4

02-07-2006, 11:05 PM	#7
5150 C10 Club Tennessee Join Date: Mar 2003 Location: White House, TN 37188 Posts: 8,281	Re: Fuel Sending Unit..Which One? I have a local vendor about 10 minutes from my house. I called him to see if he had a used one and for how much. Turns out he has a V6 sending unit NEW for $35, so I'm going down in the next couple of days to get it. Thanks guys, Bryan __________________ Bryan www.gmtruckshow.com Project "Andes"-Halen's First Truck Project: Patina Burb for he is God’s servant for your good. But if you do wrong, be afraid, for he does not bear the sword in vain. For he is the servant of God, an avenger who carries out God’s wrath on the wrongdoer. Romans 13:4

02-07-2006, 11:19 PM	#8
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,690	Re: Fuel Sending Unit..Which One? That is correct, 2 bbl small blocks, and inline trucks have 5/16 fuel line. 4 bbl small blocks, and v-6 have 3/8 fuel line. I do not know about the few 2 bbl big blocks, no clue on them, but I would guess that all big block trucks got 3/8. The only thing I am confused about here... yellow 69 has a chevy... not a GMC. Only GMC trucks had the V-6. What's your vin read? Is it a CExxxxxx, a CSxxxxxxx or a CMxxxxxxx?

02-08-2006, 03:45 PM	#9
5150 C10 Club Tennessee Join Date: Mar 2003 Location: White House, TN 37188 Posts: 8,281	Re: Fuel Sending Unit..Which One? My VIN is: CS140A135104 __________________ Bryan www.gmtruckshow.com Project "Andes"-Halen's First Truck Project: Patina Burb for he is God’s servant for your good. But if you do wrong, be afraid, for he does not bear the sword in vain. For he is the servant of God, an avenger who carries out God’s wrath on the wrongdoer. Romans 13:4

02-08-2006, 04:00 PM	#10
KFreddy Active Member Join Date: Apr 2005 Location: Miami, Florida Posts: 286	Re: Fuel Sending Unit..Which One? Not wanted to hijack this thread. I have replaced my sender twice yet my fuel gauge doesn't move at all. It just sits at the halfway mark full or empty. When I have the sender out of the tank and move it manually the gauge works fine, however installed in the tank it's a no go... Any thoughts or suggestions? Thank you, -Fred "The Great State of Florida"

02-08-2006, 05:54 PM	#12
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,690	Re: Fuel Sending Unit..Which One? Your truck came with an inline 6... a 250 or a 292...not a v 6.

02-08-2006, 06:31 PM	#13
5150 C10 Club Tennessee Join Date: Mar 2003 Location: White House, TN 37188 Posts: 8,281	Re: Fuel Sending Unit..Which One? I pretty much meant a 6 cylinder motor of some sort. __________________ Bryan www.gmtruckshow.com Project "Andes"-Halen's First Truck Project: Patina Burb for he is God’s servant for your good. But if you do wrong, be afraid, for he does not bear the sword in vain. For he is the servant of God, an avenger who carries out God’s wrath on the wrongdoer. Romans 13:4

02-08-2006, 07:27 PM	#14
Palf70Step State of Confusion! Join Date: Jul 2002 Location: Gulfport, MS USA Posts: 47,216	Re: Fuel Sending Unit..Which One? Go with the V8/V6 one...redo your lines to 3/8. You'll not regret it. __________________ Bill 1970 Chevy Custom/10 LWB Fleetside 2010 Toyota Tacoma PreRunner SR5 Double Cab - DD Member of Louisiana Classic Truck Club (LCTC) Bill's Gallery Life isn't tied with a bow, but it's still a gift. Live simply. Love generously. Care deeply. Speak kindly. Leave the rest to God!



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