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YOUR RESEARCHCan't refuel more then 10-11 gallons
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Check e6 fuse as someone else suggested
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Also checked the E6 fuse as someone else suggested on FB and it was fine.
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From my car history, the prior owner replaced the battery and my guess is it was replaced when fuel was very low.
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From my car history, the prior owner replaced the battery and my guess is it was replaced when fuel was very low.
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Suggestion
One of the guys there was able to recalibrate his gauge by filling the tank and then disconnecting the battery and leaving it overnight.
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Suggestion
If your battery was disconnected with less then ~5 gallons in it the gauge will have lost it's reference point and will have to be calibrated again.
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I did some searching and found lots of issues with refueling, but nothing specific to my issue.
I will refuel my 996 as soon as the gas light comes on. When I do, I can only get about 10 or 11 gallons into it before it tops off. If I try to keep going, the fuel will spurt out. With it having a 16 gallon tank, it seems to me I should be able to fit more than 10 or 11 gallons in.
The fuel gauge WILL show that it is full, however.....which is weird to me. I can only get about 140-160 miles on a tank though, which again seems low.
I read it may be a vent check valve? Or a fuse issue? Any help is appreciated.
Around town I get roughly 14-16 mpg, and that equates to your putting in 10-11 gallons of fuel for 140-160 miles. So it seems that your gas gauge is not reading correctly and the calibration is off. Could be the float in the gas tank is stuck. Somewhere to start....
See this diagram for where it is:
http://www.autoatlanta.com/porsche-p...section=201-01
Could be the float, the vent, the charcoal canister, or some combination.
Float issues seem to be more common in the AWD models as they have a saddle tank to get over the front drive shaft.
Once or twice every now and then isn't a big deal, but if you regularly top off (especially if fuel is spitting back out) that will damage the charcoal canister and clog it up.
Here's Pelican's write up showing the various parts of the system:
http://www.pelicanparts.com/techarti...Vent_Valve.htm
Our float always used to get stuck until I finally stopped trying to bleed every drop out of the tank. Now that I fill up at 1/8th we haven't had that problem. Last year were were having a similar issue to you and it turned out the vent host had gotten all mangled up. Once it was straightened back out, all has been good.
It would help to know the year and model.
C4 has a saddle tank with 5-6 gallons "inferred" IE: not directly measured.
If your battery was disconnected with less then ~5 gallons in it the gauge will have lost it's reference point and will have to be calibrated again.
See this thread:
https://rennlist.com/forums/996-foru...g-battery.html
The ORVR could be pissed, but usually if it goes bad you can't fill much at all. Open the fuel door and push the inlet guard back with your finger. You should hear a very faint click as the ORVR opens. If you don't hear that, the switch, or the ORVR is not functioning.
Thanks for the tips. fpb111, it's a 2002 Turbo, so it's possible that what you described with calibration is happening.
I will explore this some more and update my findings.
OK, I will add my two cents in here. 2003 C4S in California. Why is that important? In California our pumps are all vapor recovery. I can put the nozzle in and pump at full and the system will shut off and I think I am about 3-4 gallons short. It does reflect less than full on the gauge. I have been able to fill it to the top (topping off) by slowing the flow down to a trickle at the end. It takes much more time than my wife's Lincoln MXZ but it's worth the effort. I run around the desert up hear at Edwards AFB and routinely get 350 miles plus per tank. When it gets near the end of the fill-up, I stop and let it settle. It will go down from actually showing gas at the filler neck if you simply wait 10 secs or so with the nozzle in. If you jerk the nozzle out it will spill a little gas to the over flow. Now I don't know if I am doing anything wrong, but it appears that my car likes me to take my time to fill her. She doesn't like rough treatment (at least refilling) and will put out 350 miles plus. - Fast Frank
I'm having the same issue here in San Diego. I can't just keep the nozzle in and walk away. It'll start spraying out if I do. Also, when and if it seems it sprays and I get back in the car, it always seem like a burn through the first couple gallons in no time; meaning, it would make sense if the sensor wasn't calibrated correctly and it was shutting off before the tank was actually topped off. This has bothered me since I bought it last year. Would LOVE to have this riddle solved.
Tried this and I can hear the click, so it seems this is fine. Also checked the E6 fuse as someone else suggested on FB and it was fine.
See, the pump will shut off for me when I fill up, but if I try and go for more it will spit it back out. However, this morning I was able to squeeze a little more in by just slightly pulling the handle and letting it trickle in. I got a little over 12 gallons that way.
Just be aware that if 1/2 of that gallon goes into the charcoal can of the vapor recovery system it can be costly, when the CEL comes on to tell you that the system just went AWOL.
Yep, that's what I always do too. Otherwise, it shuts off early. Note: with the handle flipped over, don't try to add even 5 more cents of gas, or it will pour onto the ground.
Any DIY method to recalibrate the fuel gauge or do I need to take the care to the dealer?
I can fill ~15 gallons but the fuel gauge always shows 3/4 full. From my car history, the prior owner replaced the battery and my guess is it was replaced when fuel was very low.
Did you read the thread referenced in post 3? One of the guys there was able to recalibrate his gauge by filling the tank and then disconnecting the battery and leaving it overnight.
