|
07-11-2018, 07:33 AM
|
#1 |
|
Registered User
Join Date: Jan 2018
Location: S.E. IA
Posts: 8
|
Sending unit question
Is there a difference in sending units between a 16 gal and a 20 gal tank?
|
|
|
|
07-11-2018, 09:25 AM
|
#2 |
|
Registered User
Join Date: Jul 2007
Location: Toppenish, WA
Posts: 15,261
|
Re: Sending unit question
I've been looking for one for my 77 dualie and what I am seeing on Rock auto is 2 outlet or 3 outlet drivers side or passenger side.
If you click on the part number in blue it shows what it fits but doesn't distinguish between 16 and 20 gallon tanks https://www.rockauto.com/en/catalog/...ding+unit,4436 Checking the height and width where the sender sits they are the same on both tanks. Some sites say that the 16 gallon is a short box tank looking at the photos it looks like the added capacity is at the front of the tanks.
__________________
Founding member of the too many projects, too little time and money club. My ongoing truck projects: 48 Chev 3100 that will run a 292 Six. 71 GMC 2500 that is getting a Cad 500 transplant. 77 C 30 dualie, 454, 4 speed with a 10 foot flatbed and hoist. It does the heavy work and hauls the projects around. Last edited by mr48chev; 07-11-2018 at 09:40 AM. |
|
|
|
|
07-11-2018, 03:23 PM
|
#3 |
|
State of Confusion!
  
Join Date: Jul 2002
Location: Gulfport, MS USA
Posts: 46,586
|
Re: Sending unit question
They are the same for both size tanks. They differ on whether right or left side and 2 or 3 tube. I can't remember what year they went from 2 tube to 3 tube on the fillers, but I believe it was around 1978.
__________________
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! |
|
|
|
|
07-12-2018, 09:36 AM
|
#4 |
|
Moderator
 
Join Date: Oct 2008
Location: Wentworth, NH
Posts: 4,912
|
Re: Sending unit question
The third tube is your return line. If you have a return line from the fuel pump you need all three.
Not sure exactly when the return line became standard equipment but I believe it was available in the early 70's... I don't believe you can install 20 gallon tanks with a 6' box. 16 & 20 gallon pickup tanks are the same depth so they use the same supports and the same senders. Blazer and Suburban tanks have differing depths. The senders are side specific but the supports are not.
__________________
1959 M35A2 LDT465-1D SOLD 1967 Dodge W200 B383, NP420/NP201 SOLD 1969 Dodge Polara 500 B383, A833 SOLD 1972 Ford F250 FE390, NP435/NP205 SOLD 1976 Chevy K20, 6.5L, NV4500/NP208 SOLD 1986 M1008 CUCV SOLD 2000 GMC C2500, TD6.5L, NV4500 2005 Chevy Silverado LS 2500HD 6.0L 4L80E/NP263 2009 Impala SS LS4 V8 RTFM... GM Parts Books, GM Schematics, GM service manuals, and GM training materials...
And please let us know if and how your repairs were successful. |
|
|
|
 |
| Bookmarks |
| Thread Tools | |
| Display Modes | |
|
|
Linear Mode
