924Board.org

Guest · Posted: Sat Jun 23, 2001 7:49 am Post subject:

From: D Hook
Email: DHook65857@aol.com
Date: 23 Jun 2001
Time: 07:49:36

I'm thinking I may need to drain the gas out of the tank to do a good cleaning of the tank. Those of you who've done this, what's a good procedure? According the the Haynes, the tank can only be removed from the vehicle by dropping the rear suspension, more than I can accomplish right now. Can I remove the hose from the external pump and jump the circuit to use the pumps or will it gravity feed? And what do you do with the old gas? (Gas is probably about 3-4 years old.) Any input is appreciated.

Guest · Posted: Sat Jun 23, 2001 8:58 am Post subject:

From: Mike K
Email: Kouridakis@msn.com
Date: 23 Jun 2001
Time: 08:58:19

I have to drain my tank as well. My 931 has been sitting for an unknown amt of time.

Guest · Posted: Sat Jun 23, 2001 10:06 am Post subject:

From: Vaughan
Email: vscott77@nospam.hotmail.com
Date: 23 Jun 2001
Time: 10:06:29

Heh heh... last question is the hardest - depends on how resourceful you are! :)

Draining the tank is easy... yes you have to pull the trans and rear suspension to remove the tank, but that doesn't seem to be necessary - removing the hose from the external fuel pump seems to always get things going quite well, and flushing with some gas (till it runs clean) under gravity seems to be sufficient to clean it out. Sometimes helps to seal the end of the hose and swish the gas around...

I've gotten to the point where I do this on every 924 I buy now (on my 4th ;)

As for disposing... I'm fortunate to have neighbors w/ Chevys w/ carburettors... a Burban and a pickup... they'll burn pretty much anything, they don't really care, so when I pull out some crappy fuel, I just dump it on their tanks - they'e always happy to have gas! They're also Porsche guys, BTW.

Otherwise, you could just have lawnmower gas for life! LOL

Vaughan

Guest · Posted: Sat Jun 23, 2001 11:08 am Post subject:

From: rick maclaren
Email: rick-maclaren@home.com
Date: 23 Jun 2001
Time: 11:08:50

What are the symptoms you guys have observed that lead you to believe the tank needs flushing?

Guest · Posted: Sat Jun 23, 2001 12:37 pm Post subject:

From: larso
Email: l_porsche@hotmail.com
Date: 23 Jun 2001
Time: 12:37:55

Rick, with my car, the last 4 litres of gas, the car smoked black shit out the pipe. I thought my turbo was going, because it was intermittent, until I filled the tank up with gas and it didn't smoke black shit out the pipe anymore!

Guest · Posted: Sat Jun 23, 2001 2:56 pm Post subject:

From: D Hook
Email: DHook65857@aol.com
Date: 23 Jun 2001
Time: 14:56:17

Vaughan: Love the mower line. Yeah that Briggs and Straton would probably run fine on that old varnish. My other two vehicles are both electronic FI so I don't think it would be too smart to dump it in there. I think I read that you can strain it and use it to flush the tank. It's just the idea of straining about 7-8 gallons of gas and having it in an open bucket in the garage that makes my wife wish I had a different hobby. Or as least a different car! Maybe I'll just dump it in one of the trucks at work.

I can blow the lines out w/compressed air okay. I thought about just loosening the hose that goes to the under-the-hood fuel filter and blowing them back to the back of the car. Good or not good? Then I think I'll fill the fuel filter w/techron and hook it all back up and turn the engine over to pump that techron into the fuel distributor. Then maybe let it sit for a few days. Again, good idea or just wishful thinking?

Also, does anyone know if you can buy those crush washers for the banjo bolts at your local pep boys or napa? Or is this a catalog or dealer item only? Seems that if VW and Audi use this same CIS system, they'd be easy to find locally. Nah,...that'd be too easy. I want to change out some items like the warm up regulator and the cold start valve and really hate the idea of driving a fireball. Anyway, thanks for the help.

Guest · Posted: Sat Jun 23, 2001 3:21 pm Post subject:

From: Vaughan
Email: vscott77@nospam.hotmail.com
Date: 23 Jun 2001
Time: 15:21:30

Yeah, blowing back from the filter would be the way to go.

The symptoms noted were rough running, hesitation, that sort of thing. Gas, when drained, had crud and dirt in it.

Guest · Posted: Sat Jun 23, 2001 7:12 pm Post subject:

From: Lars
Email: l_porsche@hotmail.com
Date: 23 Jun 2001
Time: 19:12:19

my fuel was clean yellow/clear transparent, no crud or goop, when i drained it out, and it still smoked black on the last 4 litres of gas after i drained it, i never flushed it.
So maybe the clear gas goes bad too and seperates into its different carbon compounds in layers or something.

Guest · Posted: Sat Jun 23, 2001 8:21 pm Post subject:

From: D Hook
Email: DHook65857@aol.com
Date: 23 Jun 2001
Time: 20:21:31

Yeah, starts and dies right away. Does that about 6-7 times then you can keep it running by feathering the throttle. Idles like dog sh**. After futzing with it for about 15 minutes, you MIGHT get it to idle but very rough. I replaced the cold start and aux. valve and fuel filter. The first two items were AT LEAST 15 yrs old and the filter was about 4. Next is to replace the warm-up regulator and flush the tank.

Guest · Posted: Sat Jun 23, 2001 9:28 pm Post subject:

From: larso
Email: l_porsche@hotmail.com
Date: 23 Jun 2001
Time: 21:28:31

sounds like warm up regulator
does the car start when hot?

Guest · Posted: Sun Jun 24, 2001 3:41 am Post subject:

From: JoeD.
Email: porsche
Date: 24 Jun 2001
Time: 03:41:45

I was able to take my tank out with out droppen

anything just loosend it up and wiggled it 79 924 out ...I resealed it last year because of rust

Guest · Posted: Sun Jun 24, 2001 7:13 am Post subject:

From: D Hook
Email: DHook65857@aol.com
Date: 24 Jun 2001
Time: 07:13:34

Yeah, it starts right up after it's reached operating temp. Idles better, or, at least, no worse than it ever did. But gas has been sitting in there for about 3 years now.

Guest · Posted: Mon Jun 25, 2001 11:57 am Post subject:

From: Lars-Olov Persson
Email: l-o.persson@telia.com
Date: 25 Jun 2001
Time: 11:57:32

Hi,
I'm going to do the same (same rust...) How mutch did you loosen to get the tank of?

/Lars-Olov

Guest · Posted: Mon Jun 25, 2001 11:58 am Post subject:

From: Lars-Olov Persson
Email: l-o.persson@telia.com
Date: 25 Jun 2001
Time: 11:58:13

Hi,
I'm going to do the same (same rust...) How mutch did you loosen to get the tank of?

/Lars-Olov

Guest · Posted: Mon Jun 25, 2001 12:57 pm Post subject:

From: Jon McCullough
Email: apple_bit@mac.com
Date: 25 Jun 2001
Time: 12:57:53

Draining your gas tank- get a lot of big buckets! I mean 4 at the least... once you start, you can't stop!

Get the car in the air... the higher the better (I mean the more gas fumes you can suck in the higher the better heheheh

When you are draining, please- no smoking...

The gas is excellent for cleaning parts, or for lawn mowers like Vaughan said! I have two buckets left :-)

BTW: Anyone who has never done this to your car... do it with about 1/4 gas left. It only costs you a max of $5 and you will be surprised to find the crud in your tank and that will make more horsepower, and save your fuel pump and filter! It's worth it... besides- gives you a chance to check out your rear filter if you have one... replace it if you can't push air through it with a soft blow...

- Jon @ www.come.to/924.org

:-)