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I have a 2000 996 with 107k miles I had the AOS replaced about 20k miles ago. I replaced my crank position sensor about 5k miles ago to prevent hot start issues. For the third time in about 3 months (I don't drive every day) my 996 wouldn't fire after filling up with fuel. I had been having issues with gas station pump nozzles shutting off prematurely - in California where we have the vapor recovery nozzles that aren't good for topping off the fuel. But the only way I could get my tank close to full was to fill it very slowly. The first time I had the starting trouble after fueling, the car started up normally, but as soon as I pulled out onto the street and stopped at a traffic light the engine died - as if the fuel pump had stopped. When I tried to restart, the engine cranked but with no signs of fire. I pushed it back into the gas station and after 15 minutes with tow truck on the way I tried one more time - with the pedal floored - and it started after about 5 seconds of cranking. The second time about a month later, I was far from home and it wouldn't start at all after refueling (again after topping off). I found something on the internet that said you can over-fill the tank and get fuel in/near the charcoal canister - causing some sort of safety shut-off to protect the canister from damage. So I tried to siphon some gas out but my siphon tube went in the filler pipe at least 36 inches without getting wet I figured over-filling was the issue. Eventually I got frustrated, cranked with wide open throttle and after about 5 seconds it started. I replaced the fuel line vent valve to fix the premature nozzle shut-off hoping it would fix both issues. After doing so I drove to the station and filled up with fuel - no premature shut-off of the nozzle this time. But again the car wouldn't start. Without hesitation this time I cranked with wide open throttle and it started after about 5 seconds. I found this link on the internet among others saying the cool fuel can prevent a worn piston from building pressure - http://www.fixya.com/cars/t3860084-after_fuel_fill_cap_removal_2003_996 Think my next trial will be to replace the fuel pump unless anyone has a better idea? Should I test the pump pressure first before replacing? It isn't throwing any fault codes - I'm getting some occasional idle surge with the engine is hot - just started recently. Last I checked (after the first incident) nothing jumped out at me on the Durametric. All advice and DIY links appreciated. Thx
dyerhaus posted a topic in 996 Series (Carrera, Carrera 4, Carrera 4S, Targa)I’m having a weird ‘fuel thing’ with my 2001 Porsche 911… So, I’ve been thinking it gets terrible gas mileage, compared to my 986 Boxster. I expected slightly less, but, it seems pretty bad. Now, I can’t help but wonder if there’s actually something amiss about it. When I fill the tank completely—and I mean ‘topping it off’ to get every last drop in, my fuel gauge usually looks like this (see the first picture, 01). That picture was taken immediately after starting the car after filling up the tank (I was still at the pump). There have been occasions where the needle has gone all the way to just slightly past the 4/4 mark (just like the Boxster always does), but it usually lands below as seen in the photo. However, today I was down to the warning light coming on telling me I’m low on gas. I stopped to fill it up and it only took about $30 worth. That’s odd, with gas prices here and filling up an almost empty tank, that should have been between $44 and $48 (that's what the Boxster runs). I tried to top it off but it wouldn’t take any more, as if the tank was full. So, I got in the car and started it, and (just like before) this picture was taken immediately after starting the car after filling up the tank (I was still at the pump) - (see the second picture, 02). Just barely over half a thank. Any idea what could be going on with this?