Question about 1990 Pontiac Grand Am

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Draining fuel tank

1990 pontiac grand am 6 cyl. Need to empty the fuel tank, unable to siphon it out. how do we drain the tank?

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  • rabeckstrand Mar 10, 2009

    My husband worked most of an afternoon trying the hose method, cant get past the anti-siphon, any other suggestions???



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Find the fuel pump relay and take it out and replace with a jumper wire to engage the fuel pump. then connect a fitting to the schrader valve with a hose attached to it. it will pump out slowly but thats the only way i know how to do it

Posted on Jun 29, 2009

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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

  • ccn7 Mar 11, 2009

    If there is enought room, on filler tube there should be a rubber hose that connects filler tube to tank, he can take that off and maybe get hose in that way i don't know because i have never had to do it that way. I'am gessing its full of gas, if it is be carefull as gas may come out of there if its full. Like i said the smaller the hose the better, next size smaller than a standard garden hose, and keep twisting as your going in. I know its a bear believe me. If he's doing this without a hoist just put some padding on the floor under it and let fall out. Just make sure everything is unhooked.



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the FSM book covers this. (ill do the full tank pull... as you never said the JOB!)
its siphoned to near empty. (use a hand pump for fuel , sold at all boat center)
do you need the FSM page quotes?
on some cars there is an anti-spill roll over check valve
at tank fill port making siphoning very hard.
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quoted. (no smoking no open flames, outdoors best. no shop heaters of ANY KIND near)
"tank pull steps. (sure drained)
  1. Before servicing the vehicle, refer to the Precautions section.
  2. Relieve the pressure from the fuel system. (in the FSM)
  3. Disconnect the negative battery cable.
  4. Remove rear seat cushion.
  5. Disconnect connectors of fuel tank wire harness.
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  8. As fuel tank has no drain plug, drain fuel tank by pumping fuel out through fuel tank filler or fuel tank inlet. Use hand operated pump to drain fuel tank.
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      • Disconnect joint from pipe.
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