What is the best (Easiest) way to empty the gas tank? I have some bad fuel.
Thanks.

Detach the fuel line at the fuel filter. Jumper the ALDL connector to run the fuel pump. (A to G)

How much? How "bad"?
< ¼ even < ½ just fill w/ new and run until near empty.
If tank etc let water in and now have water/ethanol on bottom then try draining like above. But that won't drain last ~ 1 to 1½ gallon.

If you want near dry empty... carefully remove big fill hose and/or smaller fill vent hose on back of tank and siphon. put car level to nose up to get more of "bad" gas and water.
You may have to replace the hose doing this.

⚠️ Warning: Above Jump A-G is wrong. That will Short the Power Line to FP to Ground.
Put Power to ALDL G to Run the FP.
Use Light Bulb or Meter to G and Ground to watch FP Relay working when FP is quite or dead.

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Dr. Ian Malcolm: Yeah, but your scientists were so preoccupied with whether or not they could, they didn't stop to think if they should.
(Jurassic Park)

The Ogre's Fiero Cave

[This message has been edited by theogre (edited 05-21-2022).]

I had to do this not long ago and what I did was disconnect the inline going to the fuel filter and got myself a siphon pump from Harbor Freights and plug it in that line and start pumping onto a bucket took me about an hour to fill up about a 5 gallon jug and then I just added some good fuel in the tank to balance it out a little and run the car for a long time enough to get it low enough where you can fill up once more with good gas and voila ....

I have one of those Motive Power brake bleeding pressure bottles; I used it to pressurize my Fiero tank and drained most of a nearly-full tank using it.

I ran the hose from the pressure bottle into the Fiero fuel filler, and I used a second hose to drain gas out from the vent hose opening at the tank I used rags to seal all around both openings. It took awhile but worked great. I sat on a lawn chair next to the car and pumped often to keep the pressure up.

quote Originally posted by theogre: How much? How "bad"? < ¼ even < ½ just fill w/ new and run until near empty. If tank etc let water in and now have water/ethanol on bottom then try draining like above. But that won't drain last ~ 1 to 1½ gallon.

Adding heet should help make the fuel reabsorb the water/ethanol. Getting as much out as you can as suggested then running heet should really help.

[This message has been edited by Fiero2m4Fastback (edited 11-17-2018).]

quote Originally posted by Fiero2m4Fastback: Adding heet should help make the fuel reabsorb the water/ethanol. Getting as much out as you can as suggested then running heet should really help.

My post here mainly covers "stale gas." If you have ethanol problems then again using FP doesn't help but remove most gas so can drop and dump the tank or whatever to remove the water/ethanol at bottom.

Heet, DryGas, etc does not help when you have ethanol problems. 12oz bottles of Methanol/Isopropyl are only to help for Small amounts of water in the tank and lines to stop water freezing in winter. Adding more "Dry Gas" is often bad and can wreck the car because both alcohols are stronger solvents then ethanol. ("Dry Gas" includes all brands and Christy DryGas.) This is why most cars say will take up to 10% Ethanol, 5% Methanol, and now "banned" 10-15% MTBE. If the Owner books say anything else is often to say other alcohols and most gas additives are "banned" by the manufacturer and can void your warranty.

You can't use the FP to remove water in the tank. Water sinks to bottom and FP inlet can't suck down the last ~ 1gal depending on system design. More so when FP lives in baffles like Fiero because often the baffles add more clearance to the tank bottom. Even more when FP is install higher than designed as many replacement FP are.
Your only help is to try a small flexible siphon that reaches the bottom and park Fiero nose up so water will move to back. Even then likely can get all of it but maybe "Dry Gas" can do the rest. I won't count on that even then.

quote Originally posted by theogre: [QUOTE]Originally posted by Fiero2m4Fastback: Heet, DryGas, etc does not help when you have ethanol problems.

That's factually incorrect.