True or false? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

davebloomer · 07-16-2009, 04:53 PM

With half a tank of gas when I pull the fuel line off the tank under the cab all my gas should run out?

red71c10 · 07-16-2009, 04:57 PM

Just about. That's how I drained mine when I was trying to get the crud out and it pretty much drained it all.

davebloomer · 07-16-2009, 04:59 PM

ok, looks like i found the source of bad fuel pump... Half a tank of gas and not a drop came out... Looks like my project just got bigger

jsmithbm · 07-16-2009, 05:09 PM

I understand your question, But what will cause it to drain? The sending unit is mounted at top, right? I guess if the lines are full then the aspiration effect would cause it to drain. I had a similiar problem. I spihoned out the 20 gallons of gas. I KNOW! its not the smartest thing to do, However they do sell a kit to do it safely. I would check the tank for rust and debris and have it cleaned and sealed or do it yourself. It cost me about 80 bucks to get someone to do for me. It would be just another thing you know if fixed and will not cause you a problem later.
Just my two cents.

nvrsatisfied · 07-16-2009, 05:19 PM

or a bad sensor on the side of the float????

cause i'm thinking fuel pump is on the engine.......

67ChevyRedneck · 07-16-2009, 05:26 PM

Have you taken the sending unit out?

Your tank could be rusty and full of debri on the inside.

davebloomer · 07-16-2009, 06:13 PM

yeah as i started pulling the tank I realized that it in fact should NOT drain cause the sending unit is on top. However I decided to pull it anyway cause my fuel filters last about a week and fuel pumps about 3 weeks....

Here's a silly question.... When I drain all this gas out of the tank should it be a DARK orange/red? lol i'm thinking it's a little rusty in there. Almost looks like dyed diesel

**bigsnookmaster** · 07-16-2009, 06:16 PM

Do the math, it's not that color going in. Junk in the tank!

jsmithbm · 07-16-2009, 06:17 PM

Quote:

Originally Posted by davebloomer

yeah as i started pulling the tank I realized that it in fact should NOT drain cause the sending unit is on top. However I decided to pull it anyway cause my fuel filters last about a week and fuel pumps about 3 weeks....

Here's a silly question.... When I drain all this gas out of the tank should it be a DARK orange/red? lol i'm thinking it's a little rusty in there. Almost looks like dyed diesel

Mine looked like a very strong sweet tea or a light coffee color, once you pour it all out i would wash it out with the hose. I have heard of people putting several different types of home remedies. But drop a few bucks and get it sealed and forget it. Fuel pump and new rubber lines under 100 bucks.

davebloomer · 07-16-2009, 07:40 PM

I'm thinking it's time for tank relocation while I have it out.

jsmithbm · 07-16-2009, 07:50 PM

that would be a great idea, depends on whatca doin with the truck, there are numerous threads on here on how to do and what tanks work best. You just need to do a search.

cparman · 07-16-2009, 08:17 PM

Y'all goining to make me go look tomorrow. I thought I saw a fuel line at the bottom of my 69 c-10 swb tank on the passenger side attached to the fuel line going to the motor. Why would it not gravity feed out of the tank. Is there really a fuel line in the sender?

jsmithbm · 07-16-2009, 08:20 PM

on mine the fuel line goes up through the floor and connects to a rubber hose that connects to the sending unit with has a zinc coated alumn. line which goes down to the bottom of the tank and has a mesh "sock" at the end. The sock is your first defense against contaminats. Mine was completely gone when i removed it a few weeks ago.

Longhorn Man · 07-16-2009, 09:43 PM

yes, all the fuel should syphon out.

**special-K** · 07-16-2009, 10:23 PM

The fuel stays primed to the pump.So,it will run out when you free the line from the pump.

**El Jay** · 07-16-2009, 11:47 PM

Quote:

Originally Posted by Longhorn Man

yes, all the fuel should syphon out.

Yup.
Now my stupid questions are: gas cap on, or gas cap off? If the gas cap is on, is it a vented cap?
If air can't get into the tank, fuel can't get out.

Sinister · 07-17-2009, 05:33 AM

Fuel will definitely siphon out. Found out the hard way. PO had mufflers under the cab. Cooked the rubber fuel line. '69 with a vented cap.

davebloomer · 07-17-2009, 12:04 PM

Quote:

Originally Posted by El Jay

Yup.
Now my stupid questions are: gas cap on, or gas cap off? If the gas cap is on, is it a vented cap?
If air can't get into the tank, fuel can't get out.

yup I thought about that too. So with the lines pulled off I took the cap off and still nothing came out.. I'm going to be taking the sending unit out today to see what I can find.

Anybody need 10 gallons of Dark orange gas?

Elephanthead · 07-17-2009, 01:15 PM

I bet you can sell that gas on craigslist for 10 bucks.

**mr48chev** · 07-17-2009, 02:37 PM

That sounds like the inside of the tank on my 71 after it sat for about 10 years with gas in it. If you have a tank relocation in the plans, I'd say that now is the time to do it.

Otherwise, in the past I have flushed out tanks with a steam cleaner or high pressure washer with some success. One of the problems with these trucks is that if they happened to sit out for a while the gas caps tend to disappear and all kinds of crud tends to collect in them.

davebloomer · 07-17-2009, 02:47 PM

I took the sending unit out and it is very rusty and the sock is deteriorated through. However the bottom of the tank was very clear of debris. How are these tanks supposed to look inside? I dont see how one could not have this surface rust in it??

07-16-2009, 04:53 PM	#1
davebloomer Registered User Join Date: Apr 2009 Location: Weatherford, OK Posts: 220	True or false? With half a tank of gas when I pull the fuel line off the tank under the cab all my gas should run out?

07-16-2009, 04:57 PM	#2
red71c10 The Red Menace Join Date: Feb 2009 Location: Roseburg, OR Posts: 577	Re: True or false? Just about. That's how I drained mine when I was trying to get the crud out and it pretty much drained it all. __________________ 1971 Custom 10 - 350/350TH - Pwr steering, gauges, Chrome front bumper, Chrome hubcaps, Door edge guards, HD rear springs (current) 1968 C-20 Custom Camper - 350/350TH (orig 327), Pwr steering & brakes, gauges w/tach (former) 1968 C-20 - 307/3sp column (Dad's when I was a kid) "Driving is like coloring. Things get messy if you can't stay inside the lines."

07-16-2009, 04:59 PM	#3
davebloomer Registered User Join Date: Apr 2009 Location: Weatherford, OK Posts: 220	Re: True or false? ok, looks like i found the source of bad fuel pump... Half a tank of gas and not a drop came out... Looks like my project just got bigger

07-16-2009, 05:09 PM	#4
jsmithbm Registered User Join Date: Jun 2009 Location: Newnan, GA Posts: 485	Re: True or false? I understand your question, But what will cause it to drain? The sending unit is mounted at top, right? I guess if the lines are full then the aspiration effect would cause it to drain. I had a similiar problem. I spihoned out the 20 gallons of gas. I KNOW! its not the smartest thing to do, However they do sell a kit to do it safely. I would check the tank for rust and debris and have it cleaned and sealed or do it yourself. It cost me about 80 bucks to get someone to do for me. It would be just another thing you know if fixed and will not cause you a problem later. Just my two cents. __________________ Learning as I go! ------------------------------------- Last edited by jsmithbm; 07-16-2009 at 05:21 PM.

07-16-2009, 05:19 PM	#5
nvrsatisfied Registered User Join Date: Oct 2007 Location: oklahoma Posts: 457	Re: True or false? or a bad sensor on the side of the float???? cause i'm thinking fuel pump is on the engine....... __________________ Lug Nuts Classic Rides. (Bodywork, small fab, and Restorations) Perry, Ok. We're just two guys, trying our best. 72 cheyenne super https://67-72chevytrucks.com/vboard/...d.php?t=811512 55 chevy truck http://67-72chevytrucks.com/vboard/s...d.php?t=840174

07-16-2009, 05:26 PM	#6
67ChevyRedneck Hittin E-Z Street on Mud Tires Join Date: Nov 2004 Location: Greenville, SC Posts: 23,090	Re: True or false? Have you taken the sending unit out? Your tank could be rusty and full of debri on the inside. __________________ Jesse James 1967 C10 SWB Stepside: 350/700R4/3.73 1965 Ford Mustang: 289/T5-5spd/3.25 Trac-Loc 1968 Pontiac Firebird: Project Fire Chicken! 2015 Silverado Double Cab 5.3L Z71 2001 Jeep Wrangler Sport 4.0L 5spd 2020 Chevrolet Equinox Premium 2.0L Turbo 2011 Mustang V6 ~ Wife's ride American Born, Country by the Grace of God 1967 CST Shop Truck Rebuild! My 1967 C-10 Build Thread My Vintage Air A/C Install Project "On a Dime" Trying my hand at Home Renovation! 1965 Mustang Modifications! Last edited by 67ChevyRedneck; 07-16-2009 at 05:34 PM.

07-16-2009, 06:13 PM	#7
davebloomer Registered User Join Date: Apr 2009 Location: Weatherford, OK Posts: 220	Re: True or false? yeah as i started pulling the tank I realized that it in fact should NOT drain cause the sending unit is on top. However I decided to pull it anyway cause my fuel filters last about a week and fuel pumps about 3 weeks.... Here's a silly question.... When I drain all this gas out of the tank should it be a DARK orange/red? lol i'm thinking it's a little rusty in there. Almost looks like dyed diesel

07-16-2009, 06:16 PM	#8
bigsnookmaster Senior Member Join Date: Jan 2008 Location: St.Petersburg,Fl Posts: 1,270	Re: True or false? Do the math, it's not that color going in. Junk in the tank! __________________ greg http://community.webshots.com/user/68406Stepside

07-16-2009, 07:40 PM	#10
davebloomer Registered User Join Date: Apr 2009 Location: Weatherford, OK Posts: 220	Re: True or false? I'm thinking it's time for tank relocation while I have it out.

07-16-2009, 07:50 PM	#11
jsmithbm Registered User Join Date: Jun 2009 Location: Newnan, GA Posts: 485	Re: True or false? that would be a great idea, depends on whatca doin with the truck, there are numerous threads on here on how to do and what tanks work best. You just need to do a search. __________________ Learning as I go! -------------------------------------

07-16-2009, 08:17 PM	#12
cparman sharp as a marble Join Date: Jan 2007 Location: atlantic beach,florida Posts: 1,082	Re: True or false? Y'all goining to make me go look tomorrow. I thought I saw a fuel line at the bottom of my 69 c-10 swb tank on the passenger side attached to the fuel line going to the motor. Why would it not gravity feed out of the tank. Is there really a fuel line in the sender?

07-16-2009, 08:20 PM	#13
jsmithbm Registered User Join Date: Jun 2009 Location: Newnan, GA Posts: 485	Re: True or false? on mine the fuel line goes up through the floor and connects to a rubber hose that connects to the sending unit with has a zinc coated alumn. line which goes down to the bottom of the tank and has a mesh "sock" at the end. The sock is your first defense against contaminats. Mine was completely gone when i removed it a few weeks ago. __________________ Learning as I go! -------------------------------------

07-16-2009, 09:43 PM	#14
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,690	Re: True or false? yes, all the fuel should syphon out.

07-16-2009, 10:23 PM	#15
special-K Special Order Join Date: Nov 2004 Location: Mt Airy, MD Posts: 85,851	Re: True or false? The fuel stays primed to the pump.So,it will run out when you free the line from the pump. __________________ "BUILDING A BETTER WAY TO SERVE THE USA"......67/72......"The New Breed" GMC '67 C1500 Wideside Super Custom SWB: 327/M22/3.42 posi.........."The '67" (project) GMC '72 K2500 Wideside Sierra Custom Camper: 350/TH350/4.10 Power-Lok..."The '72" (rolling) Tim "Don't call me a redneck. I'm a rough cut country gentleman" R.I.P. ~ East Side Low Life ~ El Jay ~ 72BLUZ ~ Fasteddie69 ~ Ron586 ~ 67ChevyRedneck ~ Grumpy Old Man ~

07-17-2009, 05:33 AM	#17
Sinister Between Trucks... Join Date: Mar 2002 Location: Los Angeles, CA. Posts: 3,830	Re: True or false? Fuel will definitely siphon out. Found out the hard way. PO had mufflers under the cab. Cooked the rubber fuel line. '69 with a vented cap. __________________ Beat it to fit, Paint it to match... Last edited by Sinister; 07-17-2009 at 12:09 PM.



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07-17-2009, 01:15 PM	#19
Elephanthead Registered User Join Date: Nov 2008 Location: Carmel, IN Posts: 187	Re: True or false? I bet you can sell that gas on craigslist for 10 bucks.

07-17-2009, 02:37 PM	#20
mr48chev Registered User Join Date: Jul 2007 Location: Toppenish, WA Posts: 15,728	Re: True or false? That sounds like the inside of the tank on my 71 after it sat for about 10 years with gas in it. If you have a tank relocation in the plans, I'd say that now is the time to do it. Otherwise, in the past I have flushed out tanks with a steam cleaner or high pressure washer with some success. One of the problems with these trucks is that if they happened to sit out for a while the gas caps tend to disappear and all kinds of crud tends to collect in them.

07-17-2009, 02:47 PM	#21
davebloomer Registered User Join Date: Apr 2009 Location: Weatherford, OK Posts: 220	Re: True or false? I took the sending unit out and it is very rusty and the sock is deteriorated through. However the bottom of the tank was very clear of debris. How are these tanks supposed to look inside? I dont see how one could not have this surface rust in it??

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