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Old January 15th, 2012, 07:56 PM   #1
Hawkdriver
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Please help before I lose my mind! Fuel Problem.

I am about to lose my mind. Here's the story. I have an 02' Boxster S. I fill the tank, and it gets completely full... of course, only after manipulating the stupid pump handle to get the tank full as it shuts off every 2 to 3 gallons.... but I digress. I drive the car thereafter, and it runs perfect! Until.... just below 3/4 tank... should be approximately 4 gallons remaining. And then the car acts like it has freakin' water in the gas.... it quits, or stumbles, and shuts off for a moment, only to catch again... I though...ahhhh, I got water in my gas. So I put some fuel treatment into the tank that is the anti freeze/remove H2O from you tank stuff... I've used this in the past on various hoopties I've owned in the poorer days.... haha. I ran a couple tanks this way, being sure not to get below 3/4 tank.... and today was the day off to experiment by driving below 3/4 tank between to strategically located gas stations. Oh, I forgot to mention that when this crap happens... just a single gallon of gas, and the car runs like new again.... anyway... today, at just a tad under the 3/4 tank level... the car freakin' died, and absolutely would not restart until I put 2 gallons of gas into the tank... than like new again. I called someone that has worked on my car before... too far to drive at this point to be practical.... and he suggested maybe the fuel filter was clogged or the fuel pump was on the way out. I just finished searching every Boxster forum I could find, and the impending signs of fuel pump failure are nothing like this at all... But putting in a fuel additive does nothing! HELP!!!! I'm going to sit here and drink Sam Adams Cherry Wheat until someone replies! I'm going nutz! Thanks in advance.

Scott
Napa, CA
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Old January 15th, 2012, 08:32 PM   #2
ChrisZang
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Stupid question for my own understanding:
You write that at 3/4 there should 4 gallons remaining
The Boxster has a 16 gallon tank....
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Old January 15th, 2012, 08:36 PM   #3
Hawkdriver
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Please read carefully....

Quote:
Originally Posted by ChrisZang View Post
Stupid question for my own understanding:
You write that at 3/4 there should 4 gallons remaining
The Boxster has a 16 gallon tank....
At 3/4 GONE, there should be approximately 4 gal. remaining. Let's please stick to the topic, and not argue semantics.... especially when I already admitted I am well into my 6 pack of Sammies. Thanks.
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Old January 15th, 2012, 08:46 PM   #4
Tom M
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Quick question. If you remove and replace the gas cap does it then run?

The fact that you have trouble filling up may indicate a vent issue.
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Old January 15th, 2012, 08:53 PM   #5
Hawkdriver
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I replaced the gas cap shortly after purchasing the car as the o ring inside the gas cap was dry drotted... car runs perfect so long as I don't go below 3/4 of a tank of gas.... it was the dry rot on the gas cap that lead me to believe that there was likely water in the gas tank. .....
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Old January 15th, 2012, 08:56 PM   #6
Hawkdriver
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I just realized what you were asking... yes, today, when the engine quit, I unscrewed the gas cap, and screwed it back on... made no difference... would not start until I put in new gas...
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Old January 15th, 2012, 09:09 PM   #7
Hawkdriver
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Hmmmm.... maybe I need to supply more specific information.... gas in the tank. completely full. drive... until only 1/4 tank remains. than engine dies, until I add a minimum of 1 gallon of gas... than runs perfect.... like a stallion. changed the gas cap shortly after buying the car... this problem existed since I bought the car... so the problem was before AND after I changed the gas cap... just won't run at all when the gas level is below 1/4th tank.
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Old January 15th, 2012, 09:10 PM   #8
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Wow, pretty snippy for someone asking for help....
Getting the "semantics" straight, helps us help you

It may be a venting issue since you say you have issues getting gas into the car. I had a similar issue and had to have the flapper valve in my gas tank filler neck modified. There is a TSB about this issue.

Or you have a tank fuel pickup issue...sounds as if the pickup has been raised in the tank creating what would be similar to being out of gas. Perhaps it has come loose or was repositioned somehow incorrectly.
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Old January 15th, 2012, 09:34 PM   #9
Hawkdriver
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Sorry for the snipping... I AM losing my mind...haha... please tell me more about the pickup... could this come lose somehow and raise in the gas tank? How on earth can I fix that?
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Old January 15th, 2012, 09:42 PM   #10
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Not sure....you would need to take it to a shop....but it sure sounds like a pickup issue to me.
Would seem if it were a fuel pump going bad, it would happen intermittently at any fuel level.
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