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-   -   Best way to siphon gas? (https://www.corvetteforum.com/forums/c4-general-discussion/2815011-best-way-to-siphon-gas.html)

topgunvette 04-12-2011 04:22 PM

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Muffin 04-12-2011 04:50 PM

First thing is to buy a siphon pump. Sucking gas sucks. Better still, your fuel filter should be changed, when you remove it gas will flow out. Just be ready with containers.

gcz49 04-12-2011 05:55 PM

Get a Kentucky credit card, 6 feet of garden hose:rofl:

bac22 04-12-2011 06:19 PM

How long has the gas been sitting? Gas generally takes a year or more before it's starts become stale, but even then it will still be fine to run in the car.

PLRX 04-12-2011 06:28 PM

Hey, change the fuel filter and let gravity do the work.

topgunvette 04-12-2011 06:34 PM

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dukeallen 04-13-2011 07:53 AM


Originally Posted by gcz49 (Post 1577325478)
Get a Kentucky credit card, 6 feet of garden hose:rofl:

They only work after 2am:woohoo:

ecorse66 04-13-2011 08:31 AM

Remove the fuel filter. Attach a piece of fuel hose to the fuel line. Place end of fuel hose in a gas can. Turn on the key. Replace filter with a new one when tank is empty. :D

Dave T.

earthquake68 04-13-2011 08:37 AM

I agree, sucking gas sucks! I like the using the fuel pump to start the siphon. You can't drain the tank with the electric pump because the pump only cycles for a few seconds when you turn the key to the "on" position. I have an old mechanical pump I use to start a siphon. I put the hose in the tank and hook up the other end to my fuel pump. Place the pump on the ground with the arm facing up. Then step on the arm a couple times to start the siphon. It works great!

bac22 04-13-2011 09:10 AM


Originally Posted by vancityguy (Post 1577325787)
gas has been sitting(full tank) for maybe 3yrs(ouch) with fuel stabilizer. the car wont start just cranks so i wanted to drain the tank. figure i'd siphon out as much as i can and add some fresh fuel.

so best way is prob 6ft or so of hose?

Yeah...gas probably isn't in the best of shape at this point, but it should start. While it's probably a good idea to drain the tank I'm not so sure that's going to get the car to start, your injectors are probably in bad shape having sat for 3 years.

ecorse66 04-13-2011 09:34 AM


Originally Posted by earthquake68 (Post 1577330008)
You can't drain the tank with the electric pump because the pump only cycles for a few seconds when you turn the key to the "on" position.

That's true. I should have been more specific. GM usually provides a "fuel pump test connector." When you jump 12v to the connector the pump runs continously. On the 1986, my Factory Shop Manual says the connector is terminal "G" of the ALCL connector (OBD I) under the dash. You would not have to turn on the key. You could alternately energize terminal "D" at the fuel pump relay. I haven't done this on my Vette, but I've used the test connection several times on other GM products. Good Luck! :D

Dave T.

anciano 04-13-2011 11:30 AM


I agree, sucking gas sucks!
Ah, c'mon. It's the challenge of the thing to get the hose out of your mouth in the split second before the gas gets to the end. Use clear vinyl hose and you have a fighting chance.

And keep a bottle of mouthwash handy.:ack:

Chuck Tribolet 04-13-2011 11:44 AM

I think you have a problem other than the old gas. it
should still start and run (maybe poorly).

Siphoning? Thirty years ago I bought an electric fuel pump,
and put a long cord with clips on it. It's been handy
on a number of occasions, most recently to empty the
as out of my boat tank so I could replace the tank
(E10 was eating up the old tank, thank you Archers
Daniels Midland and the congress you bought off).

topgunvette 04-13-2011 07:03 PM

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Frizlefrak 04-13-2011 07:35 PM


Originally Posted by ecorse66 (Post 1577330382)
That's true. I should have been more specific. GM usually provides a "fuel pump test connector." When you jump 12v to the connector the pump runs continously. On the 1986, my Factory Shop Manual says the connector is terminal "G" of the ALCL connector (OBD I) under the dash. You would not have to turn on the key.

:iagree: Correct.

You can disconnect the fuel line at the filter, have a few big fuel cans ready, and run a piece of line into the can. Now run 12V to terminal G on the ALDL.....your tank will evacuate very quickly. Be ready. Also be ready to yank the wire out when the tank gets close to being empty or you will burn up your fuel pump......they don't like to run dry.

Quick, easy, and safe.

topgunvette 04-13-2011 08:03 PM

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Frizlefrak 04-13-2011 08:30 PM


Originally Posted by vancityguy (Post 1577335822)
sounds like a good way to do it. i already emptied out almost the whole tank though with a siphon.

i have a quarter tank left maybe a bit less. you think i should get that last bit out or just add some fresh gas in?

Get out as much as you can, but don't let the pump run dry. The second it starts sucking air, cut the power to it.

topgunvette 04-13-2011 09:04 PM

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Frizlefrak 04-13-2011 10:12 PM

You won't be able to get it all out anyway. Get it down as far as is practical, and then fill the tank with fresh fuel.

Even after three years of sitting, it still should have banged a couple of times. Did you check fuel pressure? Modern gasoline doesn't deteriorate nearly as quickly as some people think.

johnnymo63 04-13-2011 11:43 PM

Try giving President Obama a call. (He's been sucking the whole country dry) :skep:


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