Draining gas from the tank? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

70chev · 04-10-2006, 07:46 PM

I just found this site a couple days ago, it seems like there's a lot of knowledge here. I was wondering if anyone knows the best way to drain 5 year old gas from the tank, without removing it from the truck. Removing it seems like the only way to me.
Thanks, Jeff

Chevrolet4x4s · 04-10-2006, 08:12 PM

Siphon into a can.
Shane

carrzy4 · 04-10-2006, 08:26 PM

cant you just pour new gas in, and it cleans and changes the old stuff?
i've heard this before but dont know the truth!

1969k10stepside · 04-10-2006, 08:28 PM

drill a hole,drain it out,and patch it up

jbboater · 04-10-2006, 08:59 PM

Just did this last week. I used a clear hose to siphon tank. The hose was 1/2" dia. from hd. I attached the hose to a small piece of wood with a plastic cable tie.. The wood was about .75"x1"x4'. I used this to hold the hose to the bottom of the tank. Once drained I added about a gallon of fresh gas. The truck fired up and ran well considering it had been sitting for a year.

Fred T · 04-10-2006, 09:11 PM

Crawl under it and unhook the rubber fuel line. The older trucks had a shutoff valve and a plug for draining. Only problem is that if there is junk in the tank, the strainer won't let it out. Only way to get that out is to pull the tank and flush it.

1969k10stepside · 04-10-2006, 09:16 PM

well if the only way to do it is to remove it that isnt hard.Just a few bolts and some manuevering

70chev · 04-10-2006, 10:14 PM

Good idea, I couldn't figure out how to keep a siphon hose on the bottom of tank. I'll try your suggestion.
Thanks

edmonton72 · 04-10-2006, 10:44 PM

Quote:

Originally Posted by carrzy4

cant you just pour new gas in, and it cleans and changes the old stuff?
i've heard this before but dont know the truth!

It works for me, I do it all the time for my dirt bike. If I leave the bike for about a few weeks it won't run good so I put new gas in the tank and it would run fine. So that is a good solution, the old gas will mix with the new gas and you should be fine.

wibilly · 04-11-2006, 09:25 AM

bring it to my neighbor he will get every drop out then burn it in his truck i just drained my burb tank of 15 gal. of ten year old gas gave it to him and he was as giddy as a school girl!

shifty · 04-11-2006, 10:07 AM

if you're not going to buy a siphon tool, just get under the truck and remove the rubber line that jumps the hard line coming out of the tank to the hard line on the framerail (assuming yours has a rubber jumper between). Make sure you have the line pinched off to keep from getting yourself wet

krue · 04-11-2006, 12:54 PM

Sounds like you got an answer, so I'll just say...Welcome to the board from South Mississippi!

kiriuskris · 04-12-2006, 01:57 PM

There is a product available in most auto stores called Sea-Foam. It says you can add it to your crankcase oil and directly into the carb, but I don't feel comfortable doing that. I used it last spring with an old 80's Ford Straight 6 pickup that we were selling at an estate auction. The truck had been sitting for years (not sure how long) and would not start. So we put a can of this in the tank and topped it off with gas. Turned it over a little bit to get some new fuel in the lines. Waited 2 days and went out and the truck started right up! It worked really well as an anti-varnishing agent.

Here is the product sheet from their website if anyone is interested:

http://www.seafoamsales.com/motorTuneUpTechGas.htm

72armyswbtruck · 04-12-2006, 06:11 PM

Hey here is another easy way to drain the tank, if you have a vacuum guage tester or brake vacuum guage for bleedingt brakes then seal the tank with the cap, hook the pump up to the fuel line pump until the pressure rises then you will see the fuel just come out of the hose, drain into a gas can or jug, while it is draining open up the gas tank, this will make it drain super fast.

70chev · 04-13-2006, 03:25 AM

Quote:

Originally Posted by krue

Sounds like you got an answer, so I'll just say...Welcome to the board from South Mississippi!

Thanks, I got the old gas out and the fresh gas in. The old girl fired right up after about 5 years of sitting in the drive way.

04-10-2006, 07:46 PM	#1
70chev Registered User Join Date: Feb 2006 Location: Virginia Posts: 3	Draining gas from the tank? I just found this site a couple days ago, it seems like there's a lot of knowledge here. I was wondering if anyone knows the best way to drain 5 year old gas from the tank, without removing it from the truck. Removing it seems like the only way to me. Thanks, Jeff

04-10-2006, 08:12 PM	#2
Chevrolet4x4s Registered User Join Date: Nov 2005 Location: WV Posts: 227	Re: Draining gas from the tank? Siphon into a can. Shane __________________ 1993 K1500 350 5 speed 1985 K10 Silverado Vortec 406 5 speed (in body shop) "I been drivin' this '85 pickup truck Them buddies of mine call it a bucket of rust She's a little beat up but she still runs like the wind Yeah, kinda like me I been banged and bruisedBeen around the block a time or two But I'm runnin' like new goin' places I never been No, I ain't broke I'm just broken in" 1963 Dodge Townwagon(its amazng what 30 years and zero miles will do to a vehicle ) Member#20327

04-10-2006, 08:26 PM	#3
carrzy4 Active Member Join Date: Feb 2006 Location: BC Canada Posts: 152	Re: Draining gas from the tank? cant you just pour new gas in, and it cleans and changes the old stuff? i've heard this before but dont know the truth! __________________ S.h.i.t happens when you party naked.

04-10-2006, 08:28 PM	#4
1969k10stepside Registered User Join Date: Mar 2006 Location: USA Posts: 21,019	Re: Draining gas from the tank? drill a hole,drain it out,and patch it up

04-10-2006, 08:59 PM	#5
jbboater New Member Join Date: Mar 2006 Location: RI Posts: 50	Re: Draining gas from the tank? Just did this last week. I used a clear hose to siphon tank. The hose was 1/2" dia. from hd. I attached the hose to a small piece of wood with a plastic cable tie.. The wood was about .75"x1"x4'. I used this to hold the hose to the bottom of the tank. Once drained I added about a gallon of fresh gas. The truck fired up and ran well considering it had been sitting for a year. __________________ 1968 SWB Fleetside ~In Progress~ Plans: Disc Swap 454 Turbo 400 Lots of body work!! 2004 Victory Vegas Arlen Ness (My Bike) I guess you could say this is my second childhood.

04-10-2006, 09:11 PM	#6
Fred T Cantankerous Geezer Join Date: Aug 2002 Location: Bel Aire, KS Posts: 6,264	Re: Draining gas from the tank? Crawl under it and unhook the rubber fuel line. The older trucks had a shutoff valve and a plug for draining. Only problem is that if there is junk in the tank, the strainer won't let it out. Only way to get that out is to pull the tank and flush it. __________________ Fred There is no such thing as too much cam...just not enough engine.

04-10-2006, 09:16 PM	#7
1969k10stepside Registered User Join Date: Mar 2006 Location: USA Posts: 21,019	Re: Draining gas from the tank? well if the only way to do it is to remove it that isnt hard.Just a few bolts and some manuevering

04-10-2006, 10:14 PM	#8
70chev Registered User Join Date: Feb 2006 Location: Virginia Posts: 3	Re: Draining gas from the tank? Good idea, I couldn't figure out how to keep a siphon hose on the bottom of tank. I'll try your suggestion. Thanks

04-11-2006, 09:25 AM	#10
wibilly Senior Member Join Date: Nov 2005 Location: northwestern wi Posts: 2,111	Re: Draining gas from the tank? bring it to my neighbor he will get every drop out then burn it in his truck i just drained my burb tank of 15 gal. of ten year old gas gave it to him and he was as giddy as a school girl! __________________ common sense isn't so common anymore

04-11-2006, 10:07 AM	#11
shifty Questionable Join Date: Mar 2005 Location: Atlanta Posts: 13,373	Re: Draining gas from the tank? if you're not going to buy a siphon tool, just get under the truck and remove the rubber line that jumps the hard line coming out of the tank to the hard line on the framerail (assuming yours has a rubber jumper between). Make sure you have the line pinched off to keep from getting yourself wet __________________ If I've got anything up for grabs, it'll be here: 7-hole gauge cluster for a 67-72 p/u FREE (link) I can't check the forum daily. If I don't reply to you within 24 hours, drop me a PM! I'm (hopefully) still alive and will reply faster to a PM.

04-11-2006, 12:54 PM	#12
krue Designated A-hole! Join Date: Mar 2003 Location: South Mississippi Posts: 36,448	Re: Draining gas from the tank? Sounds like you got an answer, so I'll just say...Welcome to the board from South Mississippi! __________________ "If it ain't broke, fix it 'til it is!" Being stupid ain't illegal. We're Still Debt Free Except for the House!!! www.daveramsey.com 70 GMC SWB Stepside project "Green Booger" soon to be 6.0l/4l80e 93 S-10 "Poppaw's Truck"

04-12-2006, 01:57 PM	#13
kiriuskris New Member Join Date: Mar 2006 Location: Henry, IL Posts: 14	Re: Draining gas from the tank? There is a product available in most auto stores called Sea-Foam. It says you can add it to your crankcase oil and directly into the carb, but I don't feel comfortable doing that. I used it last spring with an old 80's Ford Straight 6 pickup that we were selling at an estate auction. The truck had been sitting for years (not sure how long) and would not start. So we put a can of this in the tank and topped it off with gas. Turned it over a little bit to get some new fuel in the lines. Waited 2 days and went out and the truck started right up! It worked really well as an anti-varnishing agent. Here is the product sheet from their website if anyone is interested: http://www.seafoamsales.com/motorTuneUpTechGas.htm __________________ Kris I'm about hot cars and fast women. Or was it hot women and fast cars?

04-12-2006, 06:11 PM	#14
72armyswbtruck Registered User Join Date: Feb 2004 Location: Idaho Posts: 4,033	Re: Draining gas from the tank? Hey here is another easy way to drain the tank, if you have a vacuum guage tester or brake vacuum guage for bleedingt brakes then seal the tank with the cap, hook the pump up to the fuel line pump until the pressure rises then you will see the fuel just come out of the hose, drain into a gas can or jug, while it is draining open up the gas tank, this will make it drain super fast. __________________ "Remember, They can Kill You, but they can't eat You, That's against the law!!!!!!!!!"



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