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TOPIC: Old gas

Old gas 20 Jun 2013 20:24 #15120


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My 928 has been sitting unused for about four years now, while life has prevented me from indulging my hobby. I'm about to finish my work on it, and I became concerned about the gas that has been sitting in the tank and in the lines for the last several years.
Does anyone have any thoughts on what concerns I should have before starting the thing up, and if concerns, what measures to take to alleviate those concerns and make things right?

Thanks !!!

Vince.
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Old gas 22 Jun 2013 01:51 #15139


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4 years?? No problem, most likely. :)

Fuel usually takes more time than that to varnish.
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Old gas 25 Jun 2013 11:33 #15161


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Well, it used to. If the fuel contains ethanol, it will be bad.

Too bad Vince didn't tell us what the model year is (always a good thing to give all of the car info when asking for help - model year, auto/manual, USA/RoW at a minimum), else we could have suggested the easiest and safest way to remove the old fuel.
Wally Plumley
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Old gas 26 Jun 2013 11:24 #15172


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I have found that 6 months of ethanol laced fuel and it starts to gum up.
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Old gas 29 Jun 2013 09:16 #15201


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Sorry guys, for the lack of detail. I'd had a long day and was wiped out and just threw the question out there without thinking.
I 've got an 86.5S,Auto, USA model, 72K miles.
I'm going to guess that there's about five gallons of fuel left in the tank. The gauge reads just above the reserve light - how accurate is that? I don't know, but I have run it down in the past and never run out of gas...So I assume it's pretty much on.

Thanks for your responses, and if there's any more detail anyone has it'll be GREATLY appreciated.

Vince.
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Old gas 29 Jun 2013 16:37 #15205


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Put some Stabil in there, filler up and good to go, hopefully.
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Old gas 29 Jun 2013 17:54 #15208


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Thanks all. I drained the fuel - about 7 gallons( so fuel gauge is pretty accurate!) renewed the filter, put in a bit of 104+ , dry gas, and five gallons of fresh hi-test. Fired right up!!!
No BS, no nothing, purred like a really big kitten. I am grateful. :-) Took it out for a short spin to check out the workings of the other things I did - rotors, brake hoses, pads, speed bleeders(half of which didn't seat right and leaked, so went back to originals) ball joint boots, greasable sway bar bushings, and Bilstein shocks. Now I find that the speedo isn't working. It just sits there at zero. I'll have to dig up some info on what the fix is for that. In the meantime, feel free to chime in!!!
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Old gas 30 Jun 2013 08:54 #15220


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Try cleaning the connector in the front corner of the spare tire well.
Wally Plumley
928 Specialists
www.928gt.com
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Old gas 30 Jun 2013 09:49 #15222


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Thanks Wally, I just looked it up on greg Nichols' page/site - probably while you were writing this!!
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Old gas 30 Jun 2013 13:28 #15224


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Went out for a drive to fill up on gas and noticed that none of the speedo stuff is working... odometer & trip odo. I looked in the spare tire well for connectors and found several. Two canister type ones that look like they belong to the braking system, one screwed onto the front wall of the well - tiny black thing with two pins, then there are two flat white connectors, each with five pins. The stuff I've read on this mentions a connector with only four pins that might be the culprit. I don't see one here. The two flat connectors wire colors areas follows, from left to right, as they sit in their space - white w/pink stripe,purple, purple/white, blk/yel, grey/yel. the other - white, blk,yel,gn, pink. Any further advice would be very welcome!!!
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Old gas 01 Jul 2013 06:58 #15230


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You're in there, and you need to close it up - just clean all of them. That wouldn't take much longer than it would take me to research the problem (look back thru the thread to find what year the car is, get out the shop manual, find the wiring diagram, dig thru the circuits to find the right connector, check the wire colors, write a reply trying to explain which connector is the right one)...
Wally Plumley
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Old gas 21 Jul 2013 14:22 #15382


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OK, I went back into the car today to clean all the contacts and found that the battery is dead. A brand new interstate battery drained in three weeks of the car sitting in the garage. All doors closed, electronic items off. Could that have anything to do with the speedo issue? My guess is not, but I'm asking anyway. So, where and how might I start to find the battery draining culprit? I may have limited mechanical knowledge/experience, but even less electrical. And, on a completely different note, I find evidence of mouse activity in the passenger side parcel shelf! The car sits for four/five years and no mouse debris.(anywhere I can see or get to) Three weeks after getting it back on the road and I get mice. What I'd like to know is how do they get INSIDE the cabin when everything(that I know of) is closed up? Aaaargh!!!
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Old gas 21 Jul 2013 15:03 #15383


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Update: Battery is severely discharged or shorted. Charger slowly cycled up to 15 amps, stabilized, then jittered back and forth a little, then click, the breaker in the charger tripped.
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Old gas 22 Jul 2013 12:23 #15399


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Disconnect the battery ground cable, and try a slow (low amperage) charge until the battery is fully charged. If the battery is full discharged, it may want more amperage than the charger can deliver on fast (high amperage) charge.

You need to check the discharge amperage.
- Battery full charged.
- Disconnect the interior light switch on the hatch lock (brown/white stripe wire).
- Everything in the car off.
- Doors closed for thirty minutes. Do not open them.
- Battery ground cable disconnected. Connect a good multimeter or Ammeter between the ground cable and a good, clean chassis/body ground. The target is 28-35 mA. Be sure that you are reading the correct Amperage level - miliAmps, as in 0.028 Amps, not 0.28 Amps or 2.8 Amps.

Your battery is probably around a 60 Amp-hour battery. A one-Amp draw will pull the battery too low to start the car in about 40 - 48 hours. A 30 mA draw will pull it down in one to two months. A 60 mA draw will pull it down in about three weeks...

"Easy" fix is a battery maintainer. Best fix is to find the current draw.
Wally Plumley
928 Specialists
www.928gt.com
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Old gas 13 Oct 2013 16:31 #16098


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Well, it's been a while since I got to return to working on the car. Life continues to intrude on my hobby.
Anyway, my battery is fully charged and I've cleaned all the contacts for the speedo, etc. located in the battery box. Took the car out around the block, and no dice. still doesn't work. Anyone have any ideas where I might look next to find and remedy this issue?
While I'm here now, I want to say thanks to everyone, especially Wally, for all of your generous input!
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Old gas 14 Oct 2013 09:42 #16104


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I think when Wally suggested 'clean all of them', he likely meant all ground points not just those in the box. There are a couple bundles under the pod and above the CE fuse block that you can check. Seems like the latter might be in proximity to the mouse activity? Also might want to clean up connections at the 14-pin (see thread by Normy on this) connector on the pass fender in front of the crosspiece, hopefully covered by a plastic dripshield. Not sure that would relate to the instrument cluster issue- but prudent maintenance esp given existing problems.
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Old gas 14 Oct 2013 10:36 #16108


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Thanks, I'll give that a whirl and let you know how things go.
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Old gas 03 Feb 2014 22:07 #16750


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How old is this batt; has it been load tested?
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