Gas shelf life

['68OrangeSunshine]

Originally Posted by KQQL IT

Why because Ethanol eats rubber parts ?
My quadrahet get used daily ish and still needs an accelerator pump every 6 months

Before Ethanol. On my '68 C/10's 292 L6, It was rigged with a Holley 4160 R8007 -- 390 CFM 4Bbl/ Offy Intake/ and Clifford Long Tube headers. I remember how every backfire cost me $5.95 for a 8.5Hg new power valve, and I had to get some member of the Holley tribe to guide me thru the mysteries of carburation. You couldn't just slap a new part in, you had to retune.I found I'm a klutz around swiss watches and found a less complicated system with the Carter AFB. I found them idiotproof.
There was a quadrajet on my '71 GMC Jimmy. When I bought it PO had replaced the stolen OEM 350 with a Goodwrench 305. Unfamuliar with the breed, I turned in the Original as a core to Checker Auto, got a generic repop and got limited results.
At one point I had a Holley 780 CFM DoublePumper on that SBC. I also tried 100 Octane Race Gas. I didn't get to experiment with it much because, coincidently, the engine Sucked Valves on both #6 and #7 cylinders. And I had to sideline the Rig.
When I rerigged that Jimmy, I got a Mr. Goodwrench 350/Weiand intake, Heddmam Hedders, Carter AFB, 600 CFM 9635S/ HEI.
It's been running OK for about 26 years. I can't recall the total mileage.
You must have a more aggressive alcohol in the pump gas mix in Cal. I've noticed more Fuel Pump failures due to agressive fuel solvents in AZ, but not so much carb distress.

[KQQL IT]

Fuel is terrible here.

[Rust_never_sleeps]

Originally Posted by KQQL IT

Fuel is terrible here.

Looks like a fair bit of moisture in there

[KQQL IT]

Central California good fuel, typically shell 91

The ethonal pulls moisture like a sponge

[Rust_never_sleeps]

Originally Posted by KQQL IT

Central California good fuel, typically shell 91

The ethonal pulls moisture like a sponge

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.

[72c20customcamper]

Originally Posted by Rust_never_sleeps

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.

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

[Rust_never_sleeps]

Originally Posted by 72c20customcamper

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

I found the article back, and as they say, water doesn't transfer directly from air to fuel, it needs to condense on a surface.
Keeping it full works because less surface of the tank is exposed, it has nothing to do with how much damp air is inside

https://www.boatus.com/expert-advice...yths-clarified

Also a good bit about how ethanol dissolves gunk from the tank that would otherwise presumably just fall into the sludge and stay out of the way

[KQQL IT]

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.

[72c20customcamper]

Originally Posted by Rust_never_sleeps

I found the article back, and as they say, water doesn't transfer directly from air to fuel, it needs to condense on a surface.
Keeping it full works because less surface of the tank is exposed, it has nothing to do with how much damp air is inside

https://www.boatus.com/expert-advice...yths-clarified

Also a good bit about how ethanol dissolves gunk from the tank that would otherwise presumably just fall into the sludge and stay out of the way

Standard logic would dictate that with less headspace you have less air but you will still get some condensation . If you topped it right to fill neck you would get very little . Just like when I bottle condition beer to much headspace flat beer to little and you get a geyser.

If you stored gas in a complete vacuum and fill the container half full you wouldn’t get any condensation.

[howzzzit]

I don't drive my truck too often, but every time I add gas I also add Berrymans B12. This is a piece from their factory.

B-12 (#0116, #0112 and #1112) disperses water, causing it to be broken into smaller globules that can be carried out of the tank and burned through the combustion system or trapped in the fuel filter. The small amount of water that is carried through to combustion actually aids in the removal of carbon build ups in the combustion area. If larger amounts of water are present such that the filter plugs readily, remove the filter and spray B-12 through from the outlet side to flush out contaminants. Replace the filter and continue to repeat the process until the water is removed and then replace the used filter with a new one.

[slikside]

Originally Posted by KQQL IT

Why because Ethanol eats rubber parts ?
My quadrahet get used daily ish and still needs an accelerator pump every 6 months

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…

[KQQL IT]

Originally Posted by slikside

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…

They all seem to fail.
My holley gets all the neoprene methanol safe parts.
Fails about half as fast

[Steeveedee]

Cliff's accelerator pump diaphragms come with a lifetime warranty, says at his site.

[Luke87gt]

Great post.

Question: My '69 has sat for years. What is the easiest way to drain the fuel?

Would it be where it transitions from hardline to rubber, right under the stock tank?

If I break that junction, it'll drain close to empty as that line is below the tank?

Thanks

[Palf70Step]

I have a cheap little electric fuelk pump I with some battery clips I use to pump my stuff out into cans.

[KQQL IT]

Originally Posted by Steeveedee

Cliff's accelerator pump diaphragms come with a lifetime warranty, says at his site.

Good to know.
Have to get one for old blue.
Now that it's cooled off its acting like it wants another one

[KQQL IT]

Originally Posted by Luke87gt

Great post.

Question: My '69 has sat for years. What is the easiest way to drain the fuel?

Would it be where it transitions from hardline to rubber, right under the stock tank?

If I break that junction, it'll drain close to empty as that line is below the tank?

Thanks

Pop cap off. It'll smell to high heaven if it's gone bad
Then make a drain fush plan or consider replacing the tank.