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#1 |
Registered User
Join Date: Jun 2010
Location: San Diego Co.
Posts: 1,193
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Re: Gas shelf life
You can just about eliminate the issue if you get carb parts designed for use with ethanol fuels. Cliffshighperformance.com is one such source for quadrajets. I’m sure there are others as well…
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1972 Chevy C-10, SWB, Fleet, 350/350, PS, PB, HEI, mostly stock, Survivor. ![]() |
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#2 | |
At the body shop.
Join Date: Aug 2009
Location: Land of fruits and nuts.
Posts: 5,316
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Re: Gas shelf life
Quote:
They all seem to fail. My holley gets all the neoprene methanol safe parts. Fails about half as fast
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" That didnt make it any newer " " Dont antique the equipment " |
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#3 | |
Registered User
Join Date: Jun 2010
Location: San Diego Co.
Posts: 1,193
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Re: Gas shelf life
Quote:
My lawnmower is a different animal though. I figured out several years back to never leave gas in the tank. I don't need to use it often, so I only put as much gas in it as I think I'll need, and when I'm done, I let it run itself out of gas (Just don't tell the CARB {California Air Resources Board...so ironic, can't make this stuff up!}) ![]()
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1972 Chevy C-10, SWB, Fleet, 350/350, PS, PB, HEI, mostly stock, Survivor. ![]() |
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#4 |
Senior Member
![]() Join Date: Jun 2022
Location: San Ramon,CA
Posts: 700
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Re: Gas shelf life
Mine sits for long periods and I generally don't sweat it. Generally it sit's about 1/3 full, so Once I crank it up I'll add a few gallons of fresh. I try to remember to add stabilizer, but frequently don't
When I got it and it was pretty rank, I dumped some Berryman in there to keep the bowl from getting sticky. Smoky, but it seems to manage the dissolved solids OK One time I got "clever" and sprayed carb cleaner right in the bowl, which immediately distorted the accelerator pump blue seal, so I don't do that anymore.
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1970 C10 Custom longbed 350/350 Code:
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#5 |
At the body shop.
Join Date: Aug 2009
Location: Land of fruits and nuts.
Posts: 5,316
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Re: Gas shelf life
Fuel is terrible here.
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" That didnt make it any newer " " Dont antique the equipment " |
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#6 |
Senior Member
![]() Join Date: Jun 2022
Location: San Ramon,CA
Posts: 700
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Re: Gas shelf life
Looks like a fair bit of moisture in there
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1970 C10 Custom longbed 350/350 Code:
__ ______|__]\____ ....|___(o)_____(o)_] |
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#7 |
At the body shop.
Join Date: Aug 2009
Location: Land of fruits and nuts.
Posts: 5,316
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Re: Gas shelf life
Central California good fuel, typically shell 91
The ethonal pulls moisture like a sponge
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" That didnt make it any newer " " Dont antique the equipment " |
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#8 |
Senior Member
![]() Join Date: Jun 2022
Location: San Ramon,CA
Posts: 700
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Re: Gas shelf life
The water in the fuel comes from condensate on the inside of the tank, not absorption out of the air, so keeping the tank full makes a big difference. I only recently learned this.
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1970 C10 Custom longbed 350/350 Code:
__ ______|__]\____ ....|___(o)_____(o)_] |
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#9 |
Registered User
Join Date: Jul 2018
Location: Catskill Mountains,NY
Posts: 8,925
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Re: Gas shelf life
Well technically the moisture condensates from the air inside the tank it’s not coming from the gas itself. Vented systems suck and expel atmosphere with temp changes . But yes it’s best to keep it full so less atmosphere is exchanged but there always will be some exchange
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Mark 72 c20 custom camper Husky edition, 66 SS396 Chevelle 1964 Hawk, 63 Avanti,62 lark 1969 AMX , 1968 c20 stepside ,85 K20 1977 Suburban sold 68 anniversary. |
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#10 |
At the body shop.
Join Date: Aug 2009
Location: Land of fruits and nuts.
Posts: 5,316
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Re: Gas shelf life
Something had changed dramatically from 1999 when It sat til 2005 when I decided to redo it again.
It ran and drove with a new battery and water bottle worth of gas poured into the carb vent. Now it doesn't sit over a month without something failing in the fuel system.
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" That didnt make it any newer " " Dont antique the equipment " |
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#11 |
State of Confusion!
![]() ![]() Join Date: Jul 2002
Location: Gulfport, MS USA
Posts: 47,471
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Re: Gas shelf life
I have a cheap little electric fuel pump with some battery clips I use to pump my stuff out into cans.
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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! Last edited by Palf70Step; 01-06-2025 at 06:42 PM. |
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#12 | |
Senior Member
![]() Join Date: Feb 2002
Location: Tucson, AZ USA
Posts: 7,622
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Re: Gas shelf life
Quote:
I use it to transfer gas from jerry cans to the gas tank. But I'v also used it to transfer gas from one truck to the other, or to de-gas a fuel tank [to jerry cans] so I could work on the Fuel Level Sender.
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Every 25 years I like to rebuild that 292, whether it needs it or not. |
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#13 |
Senior Member
![]() Join Date: Jun 2022
Location: San Ramon,CA
Posts: 700
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Re: Gas shelf life
...not uncommon to unmount the tank and slosh marbles or similar around in there to dislodge the accumulated sludge out of the bottom
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1970 C10 Custom longbed 350/350 Code:
__ ______|__]\____ ....|___(o)_____(o)_] |
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#14 |
Senior Member
![]() Join Date: Feb 2002
Location: Tucson, AZ USA
Posts: 7,622
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Re: Gas shelf life
Using my Holley Blue fuel pump
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Every 25 years I like to rebuild that 292, whether it needs it or not. |
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