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Username Post: 3/8 or 5/16 sending unit        (Topic#368479)
mean60impalagene 
Contributor
Posts: 184

Reg: 01-31-13
05-21-22 06:28 PM - Post#2841585    

1960 Chevy impala gas tank sending unit. Is there a problem if you use 3/8 instead of 5/16? It has a 235 engine and cast iron transmission.



Edited by mean60impalagene on 05-21-22 06:47 PM. Reason for edit: No reason given.

 


DonSSDD 
Silver Supporting Member
Posts: 7803
DonSSDD
Loc: Nova Scotia, Canada
Reg: 08-21-01
05-22-22 02:24 AM - Post#2841597    
    In response to mean60impalagene

No need to use the larger line but no problem not to use it. The 3/8 line was routed differently, see assembly manual. Factory installed on dual exhaust cars which would be 283/348, the routing kept heat away from the fuel line and ran through the frame tunnel and under the passenger side upper control arm. I installed it on my 59, 62, and 63.

63 Pontiac Parisienne Sport Coupe(CDN Chev mechanically (409, 4 speed),62 Bel Air SC (sold), 59 El Camino (sold), 62 Bel Air SC(sold), 63 SWC Vette (sold),
Member #2194


 
mean60impalagene 
Contributor
Posts: 184

Reg: 01-31-13
05-22-22 07:13 AM - Post#2841607    
    In response to DonSSDD

Thank you for your response. The sending unit line size is my question. I have a 5/16 unit in it now... What are the problems I will face on thee difference size? I am asking because there is a big price difference, Thank You again.



 
Tony1963 
Frequent Contributor
Posts: 1452

Loc: Orlando Florida
Reg: 07-09-18
05-22-22 12:49 PM - Post#2841621    
    In response to mean60impalagene

No issue with the larger diameter pipe coming out of the sending unit. Keep in mind that somewhere you will have to drop 3/8ths to 5/16ths.

No issues as long as electrical and connection points are the same.

People fear change because it threatens what they know, or what they claim to know.


 
mean60impalagene 
Contributor
Posts: 184

Reg: 01-31-13
05-22-22 02:24 PM - Post#2841631    
    In response to Tony1963

I am asking is it ok to go from 5/16 to 3/8 sending unit. There is a big price difference and lead me to ask this question... Thank You for your response



 
DonSSDD 
Silver Supporting Member
Posts: 7803
DonSSDD
Loc: Nova Scotia, Canada
Reg: 08-21-01
05-22-22 05:57 PM - Post#2841643    
    In response to mean60impalagene

Sorry for my misunderstanding, the pipe from the 3/8 sending unit will need to be attached to the 5/16 gas line via a rubber hose, I think it can be done. You may have to use 2 clamps if you use the 3/8 rubber line on the 5/16 pipe.

63 Pontiac Parisienne Sport Coupe(CDN Chev mechanically (409, 4 speed),62 Bel Air SC (sold), 59 El Camino (sold), 62 Bel Air SC(sold), 63 SWC Vette (sold),
Member #2194


 
mean60impalagene 
Contributor
Posts: 184

Reg: 01-31-13
05-22-22 06:46 PM - Post#2841649    
    In response to DonSSDD

I am sorry that I am bad at explaining what my question is. What performance and problems will I have to deal with? I have a 5/16 in thee tank now...Thee price difference is why I am asking if it is worth thee price. I am replacing thee tank. Thank You again guys



 
DonSSDD 
Silver Supporting Member
Posts: 7803
DonSSDD
Loc: Nova Scotia, Canada
Reg: 08-21-01
05-23-22 03:56 AM - Post#2841658    
    In response to mean60impalagene

No performance issues, the only issue is sealing the rubber line to the 2 different sizes of pipe. Is your 5/16 sending unit working good? If it is, I wouldn’t change it, the quality of reproduction sending units, especially the brass float.

63 Pontiac Parisienne Sport Coupe(CDN Chev mechanically (409, 4 speed),62 Bel Air SC (sold), 59 El Camino (sold), 62 Bel Air SC(sold), 63 SWC Vette (sold),
Member #2194


 
DonSSDD 
Silver Supporting Member
Posts: 7803
DonSSDD
Loc: Nova Scotia, Canada
Reg: 08-21-01
05-23-22 04:02 AM - Post#2841660    
    In response to DonSSDD

One other thing, but a Spectra Premium tank, there are lots of poorly made cheap fuel tanks out there too.

63 Pontiac Parisienne Sport Coupe(CDN Chev mechanically (409, 4 speed),62 Bel Air SC (sold), 59 El Camino (sold), 62 Bel Air SC(sold), 63 SWC Vette (sold),
Member #2194


 
mean60impalagene 
Contributor
Posts: 184

Reg: 01-31-13
05-25-22 07:49 PM - Post#2841837    
    In response to DonSSDD

I am going with thee 5/16 unit and I picked up a doorman tank and plan on painting just thee outside... no sealer on thee inside. Thank you guys for your time



 
Tony1963 
Frequent Contributor
Posts: 1452

Loc: Orlando Florida
Reg: 07-09-18
05-26-22 10:33 AM - Post#2841878    
    In response to mean60impalagene

I do not recommend painting the outside unless it is bare steel. Aren't those galvanized?

People fear change because it threatens what they know, or what they claim to know.


 
mean60impalagene 
Contributor
Posts: 184

Reg: 01-31-13
05-27-22 02:35 AM - Post#2841906    
    In response to Tony1963

It should not hurt it to paint it... your reason not to paint thee outside?



 


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