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1990 GMC Suburban. Tank is full,but can't seem to

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You will have a difficult time since most gas tanks have like a check ball in them. The only way I've been able to somewhat easily siphon gas from my gm vehicles, was by almost uninstalling the tank.Otherwise, it take a lot of trying but you may be able to snake the siphon hose through the breather hose along the filler neck.

Posted on Nov 01, 2012

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6ya6ya
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Posted on Jan 02, 2017

emissionwiz
  • 75822 Answers

SOURCE: gas tank

Bypass/jumper the fuel pump relay, disconnect the supply line to the injectors and turn the key on, it will pump the tank dry in about 10 minutes if it's full. You can't siphon a newer car due to the anti-siphon design of the filler neck.

Posted on Oct 22, 2008

  • 17 Answers

SOURCE: how to extract gasoline from gas tank

The syphon method is by far the easiest and you should try a smaller stiff hose to get the job done. About the only other way is to find the fuel line that comes out of the fuel pump, disconnect it, attach a hose to it, which could be difficult and turn on the ignition and let the pump, do the work.

Posted on Jan 03, 2009

  • 1118 Answers

SOURCE: draining fuel tank

You need to use a small garden hose and keep twisting it an it will go. The problem is there are baffels in the tank that you got to get around use a little patence and it will go, the smaller the hose the better. If you still can't get it you may have to for go getting the gas out and try to balance it on a floor jack. If you elect to do it that way get some help as it will be heavy and ackward.

Posted on Mar 10, 2009

alicantecoli
  • 22156 Answers

SOURCE: Siphon gas from a 1999 suburban

easy ,take pipe off under the bonnet that feeds the injection system ,then run a wire direct from the battery to the live wire on the pump ,on top of the sender unit under the seat are two heavy wires and two light wires ,well teh heavy wires are the feed and the earth for the fuel pump ,wire will spark if you touch the earth one or the pump will run if you hit the feed wire ,simple

Posted on Jun 23, 2010

bayyagg
  • 1672 Answers

SOURCE: Need to siphon gas out of tank. Got a 6 ft. piece

Modern cars can't be SIPHONED anymore! U go under ur car and drain the FUEL from the tank drain plug!
Taah!

Posted on Nov 12, 2010

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