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1/4/14 11:33pm - Original Message: 'Top it off?'
KDADDY79
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Dutchess County, NY - USA

Vette(s):
White '79 Corvette. It's a driver.

Joined: 8/27/2007
Posts: 2484
Every winter in the past I have always topped off the gas tank on my '79 and added some fuel stabilizer.
I start it every 10 days or so and let it run a good 15 - 20 minutes. 

This year I got busy and never topped it off. Now it's at the half way mark and I have not added any stabilizer. I still continue to start it just as often.

I believe the tank on a '79 has a rubber bladder. If this is true then is it really necessary to fill it up for winter storage?

P.S. I store it in an unheated, detached garage.

Kevin


|UPDATED|1/4/2014 9:33:44 PM (AZT)|/UPDATED|
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1/5/14 2:58am - Reply: 'Re: Top it off?'
HighDesertDave
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Carson City, NV - USA

Vette(s):
Numbers matching 1972 350 4 speed, silver pewter body with blue interior

Joined: 12/4/2013
Posts: 239
Living in snow country for the last 20 years I've picked up a few tips. One is to top off your tank and or try and not let it drop below half full. The reason I've always heard was to reduce the amount of water contamination from condensation. Funny, the only water contamination I've encountered was in the California bay area...where its pretty warm. I'll toss a bottle of gas dryer (grain alcohol) mid winter in my daily driver. I have been warned off on the fuel stabilizers...they are safe for small engines and I have used them for that many times with great results. My dad had a bunch of valves stick in his 55 Cad as well as my Honda motorcycle. Both were stored with Sta-Bil. A local repair shop said it is known to cause that exact issue. So is that what caused it? Hard to say. So now I let the cars who are stored over the winter run down to like a quarter tank and next spring I just toss in 5 gallons of fresh fuel and drive to the gas station to top off/dilute the old fuel. I don't stabilize them any longer. That has worked just fine for many years. I'd like to hear from someone with a more scientific explanation.

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My Christmas present to ME! Bought Sat 11-30-2013. 72, 350 4 spd, Silver with blue interior...Can't you just hear Pablo Cruz playing in the background?

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1/5/14 10:05am - Reply: 'Re: Top it off?'
DaveM Lifetime Member
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Flanders, NJ - USA

Vette(s):
1982 Black, ZZ4, Hooker Side Pipes, 3.55 Rear, Rebuilt & upgraded 700R4, All new suspension, brakes, & new Charcoal interior.

Joined: 1/27/2004
Posts: 2530

I don't add anything to mine. I use the car when I can over the winter and have never had any problems.

Dave



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1/5/14 10:19am - Reply: 'Re: Top it off?'
rod7515 Lifetime Member
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Red Lion, PA - USA

Vette(s):
1974 White 350 Corvette, TH400 Automatic 1972 Tangerine /Go Mango Convertible 383 Stroker, 2004r Automatic

Joined: 10/27/2006
Posts: 1172
I dont do anything to mine either. I drive it till the first snow falls and the roads get treated with salt and chemicals and then it goes in the garage till the spring after some road cleaning rain. I do pull it outside on nice sunday days and start it up and let it run for 15 - 20 minutes. I also make sure I pump the brakes every couple weeks as well. So far no issues.
Rodney  

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1/5/14 10:46am - Reply: 'Re: Top it off?'
Case75
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, - Canada

Vette(s):
1975 Corvette 383 stroker w/Patriot 190 heads, Eagle stroker kit, Comp 279TH7 cam, DUI distributor, Edelbrock 7116 intake, Edelbrock 1806 carb, Hedman Hedders, TH400 w/TCI Breakaway 2400 stall, Transgo 1-2 shift kit.

Joined: 6/19/2012
Posts: 230
The owner's manual for my '75 (which is the first year for the rubber bladder in the tank) says to keep it topped up when storing the car to preserve the rubber bladder or remove the bladder and coat the inside of the bladder with a light oil.

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Build Date: May 7, 1975. 383 w/267 RWHP/310 RWTQ
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1/5/14 11:46am - Reply: 'Re: Top it off?'
dyoes
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Zachary, LA - USA

Vette(s):
1974 L-48 Auto. Just your basic Vette. GM crate motor w/vortec heads and intake. Crane cam. Scorpion rockers, Edelbrock carb. Lots of parts still in boxes... :(

Joined: 1/27/2013
Posts: 201
The theory behind Stabil is that is slows fuel oxidation.  I'm not a chemical engineer, but it sounds like snake oil to me.  The best way to inhibit oxidation is to keep the tank full, which someone already mentioned. 

Then again, it's cheap insurance.  The best way to fight winter storage issues is to move down south, where we drive our cars year round!




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1/5/14 1:32pm - Reply: 'Re: Top it off?'
Sarge81 Lifetime Member
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WEST SENECA, NY - USA

Vette(s):
1981 Blue Ice Met. w/pearl ghost flames TKO500 5speed. LS1 Swap 3.45 Dana 44.

Joined: 12/3/2001
Posts: 2376
KDADDY79 said: 
I believe the tank on a '79 has a rubber bladder. If this is true then is it really necessary to fill it up for winter storage?

P.S. I store it in an unheated, detached garage.

Kevin




'75-'77 have the rubber bladder. (removable)
'78-'82 have a 1/4" thick HDPE tank with a metal shell. (non removable)

I try to store my toys with a full tank of fuel and add some Sta-Bil w/ethanol treatment. They are also stored in a unheated garage. Never had any issues. 



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1/5/14 7:16pm - Reply: 'Re: Top it off?'
rod7515 Lifetime Member
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Red Lion, PA - USA

Vette(s):
1974 White 350 Corvette, TH400 Automatic 1972 Tangerine /Go Mango Convertible 383 Stroker, 2004r Automatic

Joined: 10/27/2006
Posts: 1172
By the way Daryl, I tried that moving south thing 2 years ago but the wife rejected it. Think you would have better luck then I did, I do want to drive mine year round!
Rodney


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1/5/14 7:32pm - Reply: 'Re: Top it off?'
dwright Gold Member
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Victor, NY - USA

Vette(s):
2004 Commemorative Edition Coupe, Auto w/HUD. 13K miles in 2015. Sold 1982 Red Coupe

Joined: 7/12/2004
Posts: 6757
I was told to top it off to reduce condensation in the tank.
I was told to add Sta-Bil to stabilize the fuel.
I do both and store in a non-heated building for 4-5 months with no starting.
Haven't had any problems starting in the Spring or driving it. Knock on wood.


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1/5/14 9:37pm - Reply: 'Re: Top it off?'
KDADDY79
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Dutchess County, NY - USA

Vette(s):
White '79 Corvette. It's a driver.

Joined: 8/27/2007
Posts: 2484
Thanks for weighing in on this, guys!

I think I'll wait for a dry day and sneak it over to the gas station to top it off. That'll be fresher fuel on top of what's already in there, so it'll dilute it a bit. 

The jury's still out on the fuel stabilizer. Just havn't made up my mind on that yet. My L-48 doesn't make too many horses but it is reliable and runs smooth. Don't want to screw it up.

Thanks again!

Kevin


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1/6/14 12:48pm - Reply: 'Re: Top it off?'
Adams' Apple Lifetime Member
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Duncanville, TX - USA

Vette(s):
#1-1974 L-48 4spd Cp Med Red Metallic/Black deluxe int w/AC/tilt/tele./p/w-p/b/ Am-Fm/map light National/Regional/Chapter NCRS "Top Flight" #2-1985 Bright Red/Carmine Cp.L-98/auto Member: NCRS, NCRS Texas, Corvette Legends of Texas

Joined: 11/8/2003
Posts: 19454
HighDesertDave said:I have been warned off on the fuel stabilizers...they are safe for small engines and I have used them for that many times with great results. My dad had a bunch of valves stick in his 55 Cad as well as my Honda motorcycle. Both were stored with Sta-Bil. A local repair shop said it is known to cause that exact issue.

That's a new one on me...never heard that. Guess some particular recipes/brands might be able to cause problems like that, tho...Ermm

I've never stored any of my cars with anything in the tank other than fuel & air. The '74 stays in the garage under a cover, with a fan blowing under it 24/7(has for the past 10 years or so), the '85 stays outside, under a cover. Now...I will usually add a bottle of snake oil(Heet) to the tank when I take the '74 out of hibernation, just to break up some of the funk that has settled in the carb. So far so good on both of them....noc on wud....LOL


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1/6/14 1:20pm - Reply: 'Re: Top it off?'
HighDesertDave
Former Member
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Carson City, NV - USA

Vette(s):
Numbers matching 1972 350 4 speed, silver pewter body with blue interior

Joined: 12/4/2013
Posts: 239
"Heet" is grain alcohol often labled as "gas dryer" etc. Same ideal as swimmers ear and you put a drop of rubbing alcohol in her ear...it absorbs the water. Its real..it works. I have 3 small honda engines stored waaaay up in the Sierra mountains at my gold claim. They sit in plastic barrels with a full tank of gas in each. We always add stabil, run it through the system, turn the fuel off, run the carb dry and store. We have engines with 3 year old gas in them that light up on 1st pull. This is harder to do on a car unless you have an electric fuel pump but is the best way to insure bad gas does not thicken and gum up your carb. But in the big pic, sitting for 5 months is not going to be an issue for most folks. I'd just leave room for a few gallons of fresh before firing. Dilute the crappy oxygenated new fuels we all now use.
Dave

____________________________________
My Christmas present to ME! Bought Sat 11-30-2013. 72, 350 4 spd, Silver with blue interior...Can't you just hear Pablo Cruz playing in the background?

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