Best Method for Removing Gas from Tank

wilkinsde · 07-12-2008, 12:05 PM

I need to empty my gas tank without driving it empty as I'm in the process of replacing a defective Walboro fuel pump. The pump appears to run for about 15 minutes now before getting hot and stopping. Can anyone suggest the best way to empty the gas from the tank either through relay hookup to energize the pump for that 15 minute window, or would the old fashioned way of siphoning need to be done? Please be specific as to the relay location and hookup if this is the best method. Thanks for your help.

chrisgarrett46 · 07-12-2008, 12:26 PM

Remove the Schrader valve on the end of the fuel rail. Clamp a long 4-5 foot hose on it and place the other end in a container or another car's fuel tank. Behind the alternator you will find an electrical connector which will activate the fuel pump. Run a wire from the battery to the connector.

chrisgarrett46 · 07-12-2008, 12:29 PM

Actually there are two unconnected leads behind the alternator: the green one is the tach lead and the black is the fuel pump prime lead.

wilkinsde · 07-12-2008, 12:59 PM

Thanks. The black one energizes the pump.

mhogan6 · 07-12-2008, 03:42 PM

...and use the hood light power lead to energize the pump.

TurboPtom · 07-12-2008, 04:21 PM

Had to do that myself today. Except the low tech way of picking up the tank and pouring it out.

Thought about using the fuel rail but we couldn't get it to work. Now I know.

turbofish38 · 07-14-2008, 11:31 AM

I use the AC hose off an old R12 manifold and test gauge tool. It's the yellow hose assuming they are color coded. One end has a valve that screws onto the fuel rail so you dont have to remove the Schrader valve. Just apply 12V to the brown connector. I also made myself a fuel pressure gauge by using a VDO 100PSI gauge and the correct brass fitting from the hardware store. It just screws into the hose so that old hose serves two functions when I need it.

turbomonte2 · 07-15-2008, 05:43 PM

Yoh fish--I think you just confused the poor soul w/ the over-complicated portion of antidisestablishmentparlimentarianism...

ULYCYC · 07-15-2008, 05:59 PM

I use a old Delco AC-12 inline fuel pump I made into a siphon pump. I Added a few lengths of fuel line on both sides and a cigarette lighter plug with a 12ft lead. I had it for years. I also use it to drain the trans and power steering pump.

If you have old nasty gas, I wouldn't use the in-tank pump to draw all that trash in the system.

turbofish38 · 07-16-2008, 08:26 PM

Here are some pics of my parts. The hose can be had at Horrible Freight. The fuel gauge is from Summitt/Jegs and the fitting is from Ace Hardware.

chevygn · 07-16-2008, 11:41 PM

dude 7th grade science. place empty conainer below what you are syphoning and use some fish tube or something

chrisgarrett46 · 07-17-2008, 08:03 AM

Quote:

Originally Posted by chevygn

dude 7th grade science. place empty conainer below what you are syphoning and use some fish tube or something

He asked for the best way to drain his tank, not the way a 7th grader would do it.

beachbum · 07-17-2008, 08:07 AM

Quote:

Originally Posted by chrisgarrett46

He asked for the best way to drain his tank, not the way a 7th grader would do it.

That's the way I'd do it.

chrisgarrett46 · 07-17-2008, 08:21 AM

Quote:

Originally Posted by beachbum

That's the way I'd do it.

I'm not surprised.

Just a Six?? · 07-17-2008, 09:03 AM

Quote:

Originally Posted by beachbum

That's the way I'd do it.

I call BS!!! I saw you drilling a big hole in the bottom to drain it & then used that tank plug epoxy to seal it back up! Absolute Truth!!

07-12-2008, 12:05 PM	#1 (permalink)
wilkinsde Registered User Join Date: Jan 2008 Posts: 30	Best Method for Removing Gas from Tank I need to empty my gas tank without driving it empty as I'm in the process of replacing a defective Walboro fuel pump. The pump appears to run for about 15 minutes now before getting hot and stopping. Can anyone suggest the best way to empty the gas from the tank either through relay hookup to energize the pump for that 15 minute window, or would the old fashioned way of siphoning need to be done? Please be specific as to the relay location and hookup if this is the best method. Thanks for your help. __________________ '87GN, engine rebuilt 3-1-08 @ 131k, forged pistons, bored .030 over, 107t cam (Poston's), Poston headers, minor head porting, TA49 turbo, tranny rebuild w/ 2800 stall, stock exhaust and downpipe (no catalytic converter), adj. fuel regulator, Walbro fuel pump w/ hotwire kit, Duttweiler intercooler neck, RJC Power Plate and Rocker Shaft supports, Scanmaster, external boost gauge, 60lb injectors w/ Turbotweak chip, K&N air filter, posi-rearend, Razor's Alcohol Injection System

07-12-2008, 12:26 PM	#2 (permalink)
chrisgarrett46 Out, damned knock Join Date: May 2004 Location: Highland Park, ILLinois Posts: 6,035	Remove the Schrader valve on the end of the fuel rail. Clamp a long 4-5 foot hose on it and place the other end in a container or another car's fuel tank. Behind the alternator you will find an electrical connector which will activate the fuel pump. Run a wire from the battery to the connector. __________________ Experience is what you get when you don't get what you want. Comp roller cam, Cat stroker, RJC gridle, CPT66BB, PTE Stock Location IC, Champion iron, T&D roller rockers, 60# Mototron injectors w/Turbotweak chip, Monroe-ported throttlebody, RJC Power Plate, Jimmy-built trans w/Precision Vigilante converter, ATR SS dual exhaust, ATR rear sway, BMR upper and lower control arms, Edelbrock Performance shocks, Razor alky, Tinman cold air intake, MT street radials.

07-12-2008, 12:29 PM	#3 (permalink)
chrisgarrett46 Out, damned knock Join Date: May 2004 Location: Highland Park, ILLinois Posts: 6,035	Actually there are two unconnected leads behind the alternator: the green one is the tach lead and the black is the fuel pump prime lead. __________________ Experience is what you get when you don't get what you want. Comp roller cam, Cat stroker, RJC gridle, CPT66BB, PTE Stock Location IC, Champion iron, T&D roller rockers, 60# Mototron injectors w/Turbotweak chip, Monroe-ported throttlebody, RJC Power Plate, Jimmy-built trans w/Precision Vigilante converter, ATR SS dual exhaust, ATR rear sway, BMR upper and lower control arms, Edelbrock Performance shocks, Razor alky, Tinman cold air intake, MT street radials.

07-12-2008, 12:59 PM	#4 (permalink)
wilkinsde Registered User Join Date: Jan 2008 Posts: 30	Thanks. The black one energizes the pump. __________________ '87GN, engine rebuilt 3-1-08 @ 131k, forged pistons, bored .030 over, 107t cam (Poston's), Poston headers, minor head porting, TA49 turbo, tranny rebuild w/ 2800 stall, stock exhaust and downpipe (no catalytic converter), adj. fuel regulator, Walbro fuel pump w/ hotwire kit, Duttweiler intercooler neck, RJC Power Plate and Rocker Shaft supports, Scanmaster, external boost gauge, 60lb injectors w/ Turbotweak chip, K&N air filter, posi-rearend, Razor's Alcohol Injection System

07-12-2008, 03:42 PM	#5 (permalink)
mhogan6 mhogan6 Join Date: Mar 2006 Location: NW Austin Posts: 36	...and use the hood light power lead to energize the pump. __________________ 1987 TR Grey +++

07-12-2008, 04:21 PM	#6 (permalink)
TurboPtom Registered User Join Date: Feb 2008 Posts: 73	Had to do that myself today. Except the low tech way of picking up the tank and pouring it out. Thought about using the fuel rail but we couldn't get it to work. Now I know. __________________ Turbo Buick Owner Since 2005

07-14-2008, 11:31 AM	#7 (permalink)
turbofish38 Turbocharged BrunoStachel Join Date: Jan 2003 Location: Deltona,FL,USA Posts: 4,811	I use the AC hose off an old R12 manifold and test gauge tool. It's the yellow hose assuming they are color coded. One end has a valve that screws onto the fuel rail so you dont have to remove the Schrader valve. Just apply 12V to the brown connector. I also made myself a fuel pressure gauge by using a VDO 100PSI gauge and the correct brass fitting from the hardware store. It just screws into the hose so that old hose serves two functions when I need it. __________________ Eric Fisher OEM Parts Specialist www.gbodyparts.com 252-332-8787 e-mail me at turbofish38@hotmail.com 86 GN 11.80@115 TA49,60# Mototrons,TT chip and stock intercooler SCCA Regional Champion. Nebraska Region 1997 1986 Buick Grand National E/StreetPrepared Stay Boosted My Friends

07-15-2008, 05:43 PM	#8 (permalink)
turbomonte2 Older--but Getting Wiser Join Date: Sep 2004 Location: Myrtle Beach, SC Posts: 2,196	Yoh fish--I think you just confused the poor soul w/ the over-complicated portion of antidisestablishmentparlimentarianism... Last edited by turbomonte2; 07-15-2008 at 05:44 PM. Reason: letters

07-15-2008, 05:59 PM	#9 (permalink)
ULYCYC Fuhgeddaboudit Join Date: Sep 2000 Location: Brooklyn & Long Beach, NY Posts: 18,377	I use a old Delco AC-12 inline fuel pump I made into a siphon pump. I Added a few lengths of fuel line on both sides and a cigarette lighter plug with a 12ft lead. I had it for years. I also use it to drain the trans and power steering pump. If you have old nasty gas, I wouldn't use the in-tank pump to draw all that trash in the system. __________________ ED BAKER 87-T, Maplight equipped rear view mirror.. 93 PARK AVE"SUPERCHARGED" BPG#1458 My Photo Page buickperformancegroup.com "As democracy is perfected, the office of President represents, more and more closely, the inner soul of the people. On some great and glorious day the plain folks of the land will reach their heart's desire at last and the White House will be adorned by a downright moron."---H.L. Mencken 1927

07-16-2008, 08:26 PM	#10 (permalink)
turbofish38 Turbocharged BrunoStachel Join Date: Jan 2003 Location: Deltona,FL,USA Posts: 4,811	Here are some pics of my parts. The hose can be had at Horrible Freight. The fuel gauge is from Summitt/Jegs and the fitting is from Ace Hardware. Attached Thumbnails __________________ Eric Fisher OEM Parts Specialist www.gbodyparts.com 252-332-8787 e-mail me at turbofish38@hotmail.com 86 GN 11.80@115 TA49,60# Mototrons,TT chip and stock intercooler SCCA Regional Champion. Nebraska Region 1997 1986 Buick Grand National E/StreetPrepared Stay Boosted My Friends

07-16-2008, 11:41 PM	#11 (permalink)
chevygn Registered User Join Date: Jun 2008 Posts: 52	dude 7th grade science. place empty conainer below what you are syphoning and use some fish tube or something __________________

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