Fuel tank sending unit ??
Thread Starter
Racer
Joined: May 2011
Posts: 373
Likes: 6
From: Dover Delaware
Fuel tank sending unit ??
Hello there C3 Gurus,
I am getting ready to have a new fuel tank assembly installed in my 78 and would like to know since the fuel vapor canister was removed before I purchased the Vette can I cap off the left line that leaves the left hand side of the sending unit????
mk's78
Mike
I am getting ready to have a new fuel tank assembly installed in my 78 and would like to know since the fuel vapor canister was removed before I purchased the Vette can I cap off the left line that leaves the left hand side of the sending unit????
mk's78
Mike
Race Director
Joined: May 2006
Posts: 18,740
Likes: 2,583
Hello there C3 Gurus,
I am getting ready to have a new fuel tank assembly installed in my 78 and would like to know since the fuel vapor canister was removed before I purchased the Vette can I cap off the left line that leaves the left hand side of the sending unit????
mk's78
Mike
I am getting ready to have a new fuel tank assembly installed in my 78 and would like to know since the fuel vapor canister was removed before I purchased the Vette can I cap off the left line that leaves the left hand side of the sending unit????
mk's78
Mike
Safety Car
Joined: Sep 2013
Posts: 4,355
Likes: 2,633
From: Draper Utah
So yes, you should be able to delete the canister and cap the vapor return line unless something on a 78 is drastically different from a 70. Yes, you will smell a slight odor of gas for about 15 minutes after parking in a garage. No a 78 will not pass emissions in some states without the canister, which might effect resale depending on who is buying. Hope that helps.
Last edited by Iceaxe; Oct 19, 2019 at 03:53 PM.
Race Director
Joined: May 2006
Posts: 18,740
Likes: 2,583
vent
The 1970 Corvette (49 state) had the same sealed fuel system as the 71 and later Corvettes and no charcoal canister. The system just vented to the atmosphere through the fuel tank vent. Basically everything after the fuel tank vent on the 71 and later was deleted on the 70. 1970 CA Corvette's did get the charcoal canister.
So yes, you should be able to delete the canister and cap the vapor return line unless something on a 78 is drastically different from a 70. Yes, you will smell a slight odor of gas for about 15 minutes after parking in a garage. No a 78 will not pass emissions in some states without the canister, which might effect resale depending on who is buying. Hope that helps.
So yes, you should be able to delete the canister and cap the vapor return line unless something on a 78 is drastically different from a 70. Yes, you will smell a slight odor of gas for about 15 minutes after parking in a garage. No a 78 will not pass emissions in some states without the canister, which might effect resale depending on who is buying. Hope that helps.
Safety Car
Joined: Sep 2013
Posts: 4,355
Likes: 2,633
From: Draper Utah
Think 1978 but instead of the hose plugging into the canister it plugs into nothing and you'll have it.
If I'm not mistaken what controls the vent on both a 70 and 78 is the rollover valve on the top left of the tank.
Last edited by Iceaxe; Oct 19, 2019 at 06:56 PM.
Thread Starter
Racer
Joined: May 2011
Posts: 373
Likes: 6
From: Dover Delaware
Hey there Melwiff,
Tx for the input so let me ask what is left hand side of the fuel sending unit line used for??
I was under the impression that is was connected to the vapor canister at the other end of the line...
I am having my new tank and sending unit installed on Tuesday so should I just leave the rubber nipple on the steel line??
mk's78
Mike
Tx for the input so let me ask what is left hand side of the fuel sending unit line used for??
I was under the impression that is was connected to the vapor canister at the other end of the line...
I am having my new tank and sending unit installed on Tuesday so should I just leave the rubber nipple on the steel line??
mk's78
Mike
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
Top 10 Most Expensive Corvettes Ever Sold on Bring A Trailer
Brett Foote
10 Things Every Corvette Owner Needs (2026 Edition)
Michael S. Palmer
8 Most "Only Corvette Owners Understand" Quirks and Problems
Pouria Savadkouei
10 Reasons the C6 Z06 is Still A Performance Benchmark After 20 Years
Joe Kucinski
How Much Horsepower Every Corvette Engine "LOST" in 1972
Joe Kucinski
Top 10 DOs and DON'Ts for Protecting Your Convertible Top!
Michael S. Palmer
Top 10 Most Explosive Corvettes Ever Made: Power-to-Weight Ratio Ranked!
Joe Kucinski
150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter
Joe Kucinski
8 Coolest Corvette Pace Cars (and Replicas) of All Time
Verdad Gallardo
Race Director
Joined: May 2006
Posts: 18,740
Likes: 2,583
Vent
Hey there Melwiff,
Tx for the input so let me ask what is left hand side of the fuel sending unit line used for??
I was under the impression that is was connected to the vapor canister at the other end of the line...
I am having my new tank and sending unit installed on Tuesday so should I just leave the rubber nipple on the steel line??
mk's78
Mike
Tx for the input so let me ask what is left hand side of the fuel sending unit line used for??
I was under the impression that is was connected to the vapor canister at the other end of the line...
I am having my new tank and sending unit installed on Tuesday so should I just leave the rubber nipple on the steel line??
mk's78
Mike
Thread Starter
Racer
Joined: May 2011
Posts: 373
Likes: 6
From: Dover Delaware
Ok gotcha,
I am currently using the locking cap that came with my Vette does that one happen to be a vented one??
I do have a plain black plastic one the came with the car also..
If neither one will do the job can you pls recommend one??
So pls let me which way to go..
tx for your tireless help!!!
Mike
I am currently using the locking cap that came with my Vette does that one happen to be a vented one??
I do have a plain black plastic one the came with the car also..
If neither one will do the job can you pls recommend one??
So pls let me which way to go..
tx for your tireless help!!!
Mike
Race Director
Joined: May 2006
Posts: 18,740
Likes: 2,583
I have no idea what the cap you have looks like so I can't comment on it. Do not take a chance with it, i have personally seen a locking cap that had been used for years cause a 1969 tank to collapse because the tank vent valve failed.