F355 Question about fuel cap removal - Ferrari Life
 
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post #1 of 8 Old 09-24-2011, 08:10 AM Thread Starter
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Question about fuel cap removal

Prior to purchasing the F355, I read on website that the fuel cap should come off with ease when stopping at a gas station to fill up, I read that there shouldn't be an air pulling sound when removing the cap, as it has a pressurized system? (I thought I read this at the355.com, though, I just looked & searched the site, this is not listed).

Yesterday when I was driving around Miami Beach, I pulled into my favorite gas station (less ethanol than normal) and when I was trying to get the cap off, It took 15-20 minutes, finally I got it off with both hands and the air was flowing in as if it was taking a breath of air. I've read that these can become "sticky" so I'm curious, can I lube this in any way, I was concerned, then I thought maybe it was locked so I put the key in the 2 position and pushed the fuel door button again to ensure all was correct and all was good. I felt like I needed a tool to clamp and remove the cap.

Any advice and any experience is much appreciated.

David

The GTS Rosso Corsa and tan , from Sport Auto. Looking for a manual 360 Modena.
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post #2 of 8 Old 09-24-2011, 10:06 AM
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A friend of mine had that problem on his 348. He found there was a flip valve failure or something like that. Fairly expensive fix. he disabled his. Want me to ask him some more questions?

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post #3 of 8 Old 09-25-2011, 10:55 AM
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Spoke with him today. Turns out the rollover valve is very expensive when you buy from Ferrari, but only 30 bucks when you buy from Bosch. He fixed his. FYI, another friend on the west coast collapsed a fuel tank by not fixing this, please take action.

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post #4 of 8 Old 09-26-2011, 08:41 AM Thread Starter
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Thank you. I knew this wasn't suppose to pull in air like this.

The GTS Rosso Corsa and tan , from Sport Auto. Looking for a manual 360 Modena.
Past Ferraris:
1989 Mondial Cabriolet - Nero/Tan,
1994 348 TS
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post #5 of 8 Old 09-26-2011, 02:23 PM Thread Starter
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Well, I found a diagram... I contacted the service center and am waiting reply. I can not find purchase information on this part...

Are you sure this is what would cause the intense pressure build-up. When I went to refuel, it was a between a half tank and a quarter tank... The air pressure does this since day 1.

Does anyone else have a similar issue ?

I found Mondial through 348 info on the above advice...


139568 FUEL LINE ROLL OVER VALVE, F40/348/MONDIAL T $147.50
http://www.allferrariparts.com/searc...scription=true

I found the following information when searching for excessive fuel cap vacuum in Ferrari F355
FerrariChat.com

For those having excessive vacuum at the cap, I'd start by bypassing the two valves and run a line from the VAPOR SEPARATOR directly to the carbon can. Run it a while (making sure not to have a roll-over incident...) and recheck your system. If its still holding vacuum, your carbon can is probably loaded up. If that clears the problem, you need to look at those two valves.

Question, this is not checked on a engine out major service ?
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The GTS Rosso Corsa and tan , from Sport Auto. Looking for a manual 360 Modena.
Past Ferraris:
1989 Mondial Cabriolet - Nero/Tan,
1994 348 TS

Last edited by voila; 09-26-2011 at 02:33 PM.
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post #6 of 8 Old 09-26-2011, 02:38 PM
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Can it be the cause?....yes. Is it the cause?...Couldn't tell you for sure without diagnostics, I'm a 348 owner. The advise presented regarding a bypass test line seems seems prudent. There should NEVER be a vacuum in your fuel tank, always a slight pressure. Also...the valves identified in the drawing as 4-2 way breather valve bear a resemblance to the parts replaced by my friend in his car. I'll call him and ask that he interject in this thread.

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post #7 of 8 Old 09-26-2011, 02:51 PM
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Assuming I understood him correctly they were the part number 21 from the following 348 sketch. They are intended to recycle air that has passed through the fuel canister. When they fail, a vacuum is drawn which migrates backwards into the fuel tank.
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post #8 of 8 Old 09-26-2011, 03:32 PM Thread Starter
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Thank you for your time and help. I appreciate this greatly.





The GTS Rosso Corsa and tan , from Sport Auto. Looking for a manual 360 Modena.
Past Ferraris:
1989 Mondial Cabriolet - Nero/Tan,
1994 348 TS
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