Need help identifying fuel sending unit - The 1947 - Present Chevrolet & GMC Truck Message Board Network

70c10 · 09-30-2004, 08:14 PM

This is the old sending unit I pulled tonight from my dad's 70'. I bought a new one last year and installed it tonight but the metal line coming out of the top of the new unit is a little larger in diameter, comes out of the top where I'm pointing and the nut is bigger (3/4" compared to 9/16") and also longer. The new box is marked 67-71 8 cylinder. Could my original unit have been for a 6 cylinder?. If anybody knows the differences in sending units, I would appreciate any help!. Thanks

**68 Stepside** · 09-30-2004, 08:19 PM

It's very possible that your original sender was for a 6 cylinder. The 6 cylinder fuel sender lines are smaller than the V8 lines. Is the truck an original V8?

70c10 · 09-30-2004, 08:24 PM

I don't know if it was originally a 6 cylinder truck but if you are sure about the size it probably was!. DAMN!. Is there any way to make this work?. Maybe I can buy some steel tubing and work from the sending unit back to the fuel pump with this new size line?. I guess it would be easier to buy the 6 cylinder unit,huh?

longhorn71 · 10-01-2004, 01:57 AM

If Your Vin Starts With Ce..it Is A V-8 If It Starts With Cs... It Was A 6 Powerd Truck

687980chevy · 10-01-2004, 02:28 AM

Is there any other difference beside the tube size? My truck had a V8 in it when I bought it.It was a 292 I-6.The reason I ask is because it's hard to start if it sits awhile(2-3 days). I was wondering if the pickup tube might be higher or lower on a V8?

70c10 · 10-01-2004, 07:16 AM

longhorn71, my vin on my truck starts with CE and I have the same sending unit as pictured. I think I might go to the junkyard and see if I can get this piece of line from the same setup, otherwise I might bend a piece of tubing and find a fitting to work.

shadetree · 10-01-2004, 02:24 PM

Some trucks with the smaller v8's also used the smaller fuel lines. 70, you should be able to buy an adaptor, that reduces from one line size to another. The style of fitting used is SAE double flare, and fittings are available at all parts stores. The use of an adaptor should get your truck going, but the best solution would be to buy steel line, and bend up a new line (it's easier than you might think).

pickupman · 10-01-2004, 05:08 PM

Jim, If your V8 had a 2bl on it originally it also took the 5/16 line and the 4 bl carbs took the 3/8 line.

Bill

**Classic Heartbeat** · 10-01-2004, 05:25 PM

You should be able to buy a reducer from the hardware store to make the new one work. WES www.ClassicHeartbeat.com

70c10 · 10-02-2004, 07:32 AM

Thanks Bill. Wes, the problem with the reducer idea is the two ends don't line up due to the new sending unit's tube location. It comes out of the top about 1/2" higher and can't be bent or I will damage the unit.

09-30-2004, 08:14 PM	#1
70c10 67-72 Addict! Join Date: Feb 2002 Location: The TAX State! Posts: 7,856	Need help identifying fuel sending unit This is the old sending unit I pulled tonight from my dad's 70'. I bought a new one last year and installed it tonight but the metal line coming out of the top of the new unit is a little larger in diameter, comes out of the top where I'm pointing and the nut is bigger (3/4" compared to 9/16") and also longer. The new box is marked 67-71 8 cylinder. Could my original unit have been for a 6 cylinder?. If anybody knows the differences in sending units, I would appreciate any help!. Thanks Attached Images __________________ 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

09-30-2004, 08:19 PM	#2
68 Stepside huh? Join Date: May 2000 Location: Washington, Illinois Posts: 5,690	It's very possible that your original sender was for a 6 cylinder. The 6 cylinder fuel sender lines are smaller than the V8 lines. Is the truck an original V8? __________________ Someday when I'm lonely, Wishing you weren't so far away, Then I will remember Things we said today. RIP El Jay

09-30-2004, 08:24 PM	#3
70c10 67-72 Addict! Join Date: Feb 2002 Location: The TAX State! Posts: 7,856	I don't know if it was originally a 6 cylinder truck but if you are sure about the size it probably was!. DAMN!. Is there any way to make this work?. Maybe I can buy some steel tubing and work from the sending unit back to the fuel pump with this new size line?. I guess it would be easier to buy the 6 cylinder unit,huh? __________________ 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

10-01-2004, 02:28 AM	#5
687980chevy Registered User Join Date: Feb 2004 Location: Hilly Southern Indiana! Posts: 201	Other differences in senders I6 vs V8 Is there any other difference beside the tube size? My truck had a V8 in it when I bought it.It was a 292 I-6.The reason I ask is because it's hard to start if it sits awhile(2-3 days). I was wondering if the pickup tube might be higher or lower on a V8? __________________ 68 K-10,79 K-10,80 C-30 57 chevy convertible 79 Z28

10-01-2004, 07:16 AM	#6
70c10 67-72 Addict! Join Date: Feb 2002 Location: The TAX State! Posts: 7,856	longhorn71, my vin on my truck starts with CE and I have the same sending unit as pictured. I think I might go to the junkyard and see if I can get this piece of line from the same setup, otherwise I might bend a piece of tubing and find a fitting to work. __________________ 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

10-01-2004, 01:57 AM	#4
longhorn71 Senior Member Join Date: Sep 2004 Location: CANADA Posts: 1,681	If Your Vin Starts With Ce..it Is A V-8 If It Starts With Cs... It Was A 6 Powerd Truck

10-01-2004, 02:24 PM	#7
shadetree Senior Member Join Date: Dec 1999 Location: Knightstown, in, usa Posts: 2,525	Some trucks with the smaller v8's also used the smaller fuel lines. 70, you should be able to buy an adaptor, that reduces from one line size to another. The style of fitting used is SAE double flare, and fittings are available at all parts stores. The use of an adaptor should get your truck going, but the best solution would be to buy steel line, and bend up a new line (it's easier than you might think). __________________ 1970 long fleet, 355 4 speed, primer, walnut goodies

10-01-2004, 05:08 PM	#8
pickupman Registered User Join Date: Dec 2000 Location: Greeneville, TN Posts: 3,097	Jim, If your V8 had a 2bl on it originally it also took the 5/16 line and the 4 bl carbs took the 3/8 line. Bill __________________ atheystruck@comcast.net 67 1/2 ton 4wd custom cab 72 1/2 ton 4wd super cheyenne 71 1/2 BB super cheyenne shortbed

10-01-2004, 05:25 PM	#9
Classic Heartbeat Project Junkie! Fishing Poor!! Join Date: Dec 1999 Location: Olympia,Wa. 98512 Posts: 10,766	You should be able to buy a reducer from the hardware store to make the new one work. WES www.ClassicHeartbeat.com __________________ On-line catolog Classic Heartbeat Pickup Parts WEHEPP@comcast.net Call us Toll Free (888) 338-2502 Like Us on Facebook No appointment necessary. 72 BB Chevy Custom Deluxe / Custom Camper 67 I-6 (Soon to be 5.7 LS1) Panel 68 BB Chevy Short Bed 72 6.0 LQ9 Short Bed Chevy 4X4 Olympia's fastest growing truck parts supplier. Olympia's home for Wayward Chevys

10-02-2004, 07:32 AM	#10
70c10 67-72 Addict! Join Date: Feb 2002 Location: The TAX State! Posts: 7,856	Thanks Bill. Wes, the problem with the reducer idea is the two ends don't line up due to the new sending unit's tube location. It comes out of the top about 1/2" higher and can't be bent or I will damage the unit. __________________ 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

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