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How to drain gas tank?

Metalhead47

Metalhead47

1/2 ton status
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Whidbey Island, WA
I've got $150 in gas that I'd like to claim from my now engineless Suburban that's gonna be sitting for a while. Can't get a tube down the filler neck & my siphon pump is a POS anyway. Is there any easy way to hotwire the fuel pump (TBI) so I can drain the tank? Hooking up the main power wire (not the start/alt leads) to the battery didn't do a thing, nothing but the radio would power on.
 
Metalhead47 said:
I've got $150 in gas that I'd like to claim from my now engineless Suburban that's gonna be sitting for a while. Can't get a tube down the filler neck & my siphon pump is a POS anyway. Is there any easy way to hotwire the fuel pump (TBI) so I can drain the tank? Hooking up the main power wire (not the start/alt leads) to the battery didn't do a thing, nothing but the radio would power on.
Click to expand...


I would just leave the ten gallons in it....:haha::haha::haha:
 
I had the same problem. Make sure the siphon hose isn't too fat. Keep messing with it and it will work down the bend to the bottom of the tank.
 
there is a red wire coming off of the fuel pump relay, hook your battery back up, and run a positive wire to that lead, and it should turn on the fuel pump.
 
When I had to get the old gas out of my Blazer when I first bought it... I got a trick little siphon pump from the auto parts store that hooked up to an electric drill.
Emptied the tank in about 15 minutes or so.
 
four_by_ken said:
When I had to get the old gas out of my Blazer when I first bought it... I got a trick little siphon pump from the auto parts store that hooked up to an electric drill.
Emptied the tank in about 15 minutes or so.
Click to expand...


only problem with that is drills tend to throw sparks :weld:

i have a external inline fuel pump i use but that dang thing is slow as heck
 
ya, i had to do this my moms 97 burb, i just popped the hood and found the fuel pump relay, took a paper clip and heard it turn on, so i took off the hard line right before the filter and hooked up a 5ft rubber hose and drained it into tanks i had.
 
Jason4x4 said:
there is a red wire coming off of the fuel pump relay, hook your battery back up, and run a positive wire to that lead, and it should turn on the fuel pump.
Click to expand...

Sounds easy enough, where is the relay? Ugh I've spend so much time fixing the big problems on this rig I don't even know the easy stuff like where the fuse box is :doah:
 
abig84 said:
only problem with that is drills tend to throw sparks :weld:

i have a external inline fuel pump i use but that dang thing is slow as heck
Click to expand...

I did actually fill a couple of 5 gal jugs using the motorcycle fuel pump from my Samurai, but not only is it slow too, I'm afraid of burning it out. Running that thing is enough of a strain on it.
 
On the firewall, above where the passenger side valve cover would be. IIRC, it is a red wire that comes out about 1-2" from the relay.
 
Or just disconnect it at the fuel filter, and siphon from there into a bucket. It won't be that fast, but who cares, you don't have to lay there the whole time. It may siphon itself if there is fuel in the lines still, mine did when the fuel filter wasn't tightened all the way.

Fuel pump will work, done that, but you'd want to be right there while it's working.
 
Metalhead47 said:
I've got $150 in gas that I'd like to claim from my now engineless Suburban that's gonna be sitting for a while. Can't get a tube down the filler neck & my siphon pump is a POS anyway. Is there any easy way to hotwire the fuel pump (TBI) so I can drain the tank? Hooking up the main power wire (not the start/alt leads) to the battery didn't do a thing, nothing but the radio would power on.
Click to expand...

sharp screw driver:D..oh you want to save the tank, um nevermind
 
You should be able to jump the pump at the OBD port under your dash. Get out your tech manual and find out which terminals to jump.
 
Just google aldl pinout or variations of that, and it should show up which terminal is the fuel pump.

Not sure we ever determined if there is a terminal on the ALDL connector for fuel pump, since there is a pigtail off the relay connector under the hood. Kind of redundant, albeit easier.
 
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