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Draining fuel tank

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Old Oct 6, 2009 | 10:02 PM
  #1  
RocketyMan's Avatar
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From: Washington-state
Car: '96 Camaro-Vsux -- SOLD, '84 Z/28
Engine: 3.8L, 305 SBC
Transmission: 4L60E, T-5
Axle/Gears: 3.08s, 3.23s
Draining fuel tank

Hey guys. I was wondering if anyone knew a good way to drain the fuel tank. My 3rd gen has been sitting for 5 years and well...yeah.

I'm thinking getting the fuel out from up front would be the best idea?

Lemme know what you guys think.
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Old Oct 7, 2009 | 12:03 PM
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From: Littleton, CO USA
Car: 82 Berlinetta/57 Bel Air
Engine: L92/LQ4 (both w/4" stroke)
Transmission: 4L80E/4L80E
Axle/Gears: 12B-3.73/9"-3.89
Welcome aboard thirdgen.org.

Some details about your car would be helpful - year, model, engine, induction, modifications, etc.
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Old Oct 8, 2009 | 11:02 AM
  #3  
RocketyMan's Avatar
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From: Washington-state
Car: '96 Camaro-Vsux -- SOLD, '84 Z/28
Engine: 3.8L, 305 SBC
Transmission: 4L60E, T-5
Axle/Gears: 3.08s, 3.23s
Re: Draining fuel tank

Yeah..that's true.

It's an '83 305 with the t-5 in it. It's the HO, so it has the carburetor.
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Old Oct 8, 2009 | 06:24 PM
  #4  
camaronewbie's Avatar
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From: Cary, North Carolina
Car: 1992 RS
Engine: Carbed 350
Transmission: 700R4
Axle/Gears: 3.42 posi
Re: Draining fuel tank

Get a $5 syphon from the local hardware store and syphon it out from the rear - as I don't think you have an in-tank pump to pump it out with.
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Old Oct 9, 2009 | 12:24 AM
  #5  
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From: Washington-state
Car: '96 Camaro-Vsux -- SOLD, '84 Z/28
Engine: 3.8L, 305 SBC
Transmission: 4L60E, T-5
Axle/Gears: 3.08s, 3.23s
Re: Draining fuel tank

I think I'm just gonna take it out from the front of the car and like jack up the back.
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Old Oct 9, 2009 | 12:27 AM
  #6  
RocketyMan's Avatar
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From: Washington-state
Car: '96 Camaro-Vsux -- SOLD, '84 Z/28
Engine: 3.8L, 305 SBC
Transmission: 4L60E, T-5
Axle/Gears: 3.08s, 3.23s
Re: Draining fuel tank

Does anyone have a good drawing or pictures of the manual pump on the 305?
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Old Oct 9, 2009 | 12:13 PM
  #7  
five7kid's Avatar
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From: Littleton, CO USA
Car: 82 Berlinetta/57 Bel Air
Engine: L92/LQ4 (both w/4" stroke)
Transmission: 4L80E/4L80E
Axle/Gears: 12B-3.73/9"-3.89
Originally Posted by RocketyMan
Does anyone have a good drawing or pictures of the manual pump on the 305?
https://www.thirdgen.org/forums/atta...flare_nut2.jpg

#1 is the supply line from the tank, #2 is the return to the tank, #3 is the outlet to the carb.

Problem with trying to siphon these tanks is the filler neck has the opening into the tank facing up - basically the filler tube enters the tank horizontally, the end of the tube is capped off, and the top of the tube is cut open to allow fuel into the tank. Very hard to get a siphon tube to go to the bottom of the tank.

If your car is the HO, it may or may not have an in-tank electric pump (added late in the '83 model year, as I understand). If it does, you can take the supply line off of the mechanical pump, jumper the in-tank electric to run it, and drain it into a container. If it doesn't, you can try to siphon the gas out of the supply line disconnected from the mechanical pump.
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Old Oct 9, 2009 | 05:21 PM
  #8  
RocketyMan's Avatar
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From: Washington-state
Car: '96 Camaro-Vsux -- SOLD, '84 Z/28
Engine: 3.8L, 305 SBC
Transmission: 4L60E, T-5
Axle/Gears: 3.08s, 3.23s
Re: Draining fuel tank

Originally Posted by five7kid
https://www.thirdgen.org/forums/atta...flare_nut2.jpg

#1 is the supply line from the tank, #2 is the return to the tank, #3 is the outlet to the carb.

Problem with trying to siphon these tanks is the filler neck has the opening into the tank facing up - basically the filler tube enters the tank horizontally, the end of the tube is capped off, and the top of the tube is cut open to allow fuel into the tank. Very hard to get a siphon tube to go to the bottom of the tank.

If your car is the HO, it may or may not have an in-tank electric pump (added late in the '83 model year, as I understand). If it does, you can take the supply line off of the mechanical pump, jumper the in-tank electric to run it, and drain it into a container. If it doesn't, you can try to siphon the gas out of the supply line disconnected from the mechanical pump.

Ok wow. So when I went to drain the oil from the engine, I got gasoline/oil mixture. About 7 quarts of it!!! Is there any chance that my manual pump could be leaking into the crank? It basically smells like gas-old gas!!
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Old Oct 9, 2009 | 05:39 PM
  #9  
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From: Littleton, CO USA
Car: 82 Berlinetta/57 Bel Air
Engine: L92/LQ4 (both w/4" stroke)
Transmission: 4L80E/4L80E
Axle/Gears: 12B-3.73/9"-3.89
A leaking mechanical fuel pump diaphragm is the typical source for gasoline in the oil.
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Old Oct 9, 2009 | 06:43 PM
  #10  
RocketyMan's Avatar
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Posts: 369
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From: Washington-state
Car: '96 Camaro-Vsux -- SOLD, '84 Z/28
Engine: 3.8L, 305 SBC
Transmission: 4L60E, T-5
Axle/Gears: 3.08s, 3.23s
Re: Draining fuel tank

Originally Posted by five7kid
A leaking mechanical fuel pump diaphragm is the typical source for gasoline in the oil.
Mk. Yeah I thought so. I'm having a little bit of trouble trying to get the hardline to the carb off the pump but I'm wondering, is there a way to repair the gaskets in the pump?
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Old Oct 9, 2009 | 06:57 PM
  #11  
five7kid's Avatar
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Posts: 43,187
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From: Littleton, CO USA
Car: 82 Berlinetta/57 Bel Air
Engine: L92/LQ4 (both w/4" stroke)
Transmission: 4L80E/4L80E
Axle/Gears: 12B-3.73/9"-3.89
It's the diaphragm that does the actual pumping that leaks.

Just replace the pump.
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Old Oct 9, 2009 | 06:58 PM
  #12  
RocketyMan's Avatar
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15 Year Member
 
Joined: Oct 2009
Posts: 369
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From: Washington-state
Car: '96 Camaro-Vsux -- SOLD, '84 Z/28
Engine: 3.8L, 305 SBC
Transmission: 4L60E, T-5
Axle/Gears: 3.08s, 3.23s
Re: Draining fuel tank

Originally Posted by five7kid
It's the diaphragm that does the actual pumping that leaks.

Just replace the pump.

I'm guessing these go out very easily?? And what would you expect to pay for one?
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