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Thread: Can't fill gas tank without nozzle clicking off!

  1. #11
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    Quote Originally Posted by bglz42 View Post
    I am just now digging into this system... does the purge valve that is mounted on the engine also control the air escaping from the tank when the engine is off? In my research, I have run across the mention of a "rollover" valve mounted to the tank. I have heard of a full tank replacement to fix this problem. Also, how does this problem occur? I have owned the car since new, have 40k miles on it, and it just started on this fillup. Does a check valve/purge valve/rollover valve go bad suddenly? Since nothing is vented to atmosphere, I don't see how a dirt dobber or other foreign body can plug it. Any ideas?
    Here is a diagram:
    500 Emission Diagram.jpg
    500 Emission Description.jpg

  2. The Following User Says Thank You to KellyfromVA For This Useful Post:

    blaked (03-14-2019)

  3. #12
    Senior Member bglz42's Avatar
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    Thanks!
    2013 Abarth Cabrio Bianco/Grigio (Totaled, RIP) 2013 Abarth Cabrio Bianco/Nero, 2001 Boxster S

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    Damn, that's complicated!!

  5. #14
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    Quote Originally Posted by bcox722002 View Post
    Damn, that's complicated!!
    No more than any modern emission system. The unfortunate part with these cars is the fuel tank vent valve is attached directly to the tank, rather than being in the filler pipe like other cars. You pretty much have to drop the tank to do anything. But hey, at least it's a small tank! Dropping the 38 gallon fuel tank on my Ford F350 pickup is much more of a chore.

  6. #15
    Senior Member bglz42's Avatar
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    FIXED IT! Short version: I whacked the top of the rollover valve with a screwdriver handle! It is accessed under the rear seat, and had somehow tripped to block any escaping gas or liquid.

    Longer version: I removed the carbon canister and began troubleshooting. The canister was flowing well, so I eliminated that variable. Attached a Mityvac to the outlet hoses and applied vacuum. The main larger hose was blocked and would not flow air. I removed the hose from the rollover valve, accessed under the seat, and applied vacuum. Whacked the valve and heard it pop open! Buttoned everything up and went to the station and filled up without the pump clicking off! Victory! If it happens again, at least I know where the problem is...
    2013 Abarth Cabrio Bianco/Grigio (Totaled, RIP) 2013 Abarth Cabrio Bianco/Nero, 2001 Boxster S

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    blaked (03-14-2019)

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    Quote Originally Posted by bglz42 View Post
    FIXED IT! Short version: I whacked the top of the rollover valve with a screwdriver handle! It is accessed under the rear seat, and had somehow tripped to block any escaping gas or liquid.

    Longer version: I removed the carbon canister and began troubleshooting. The canister was flowing well, so I eliminated that variable. Attached a Mityvac to the outlet hoses and applied vacuum. The main larger hose was blocked and would not flow air. I removed the hose from the rollover valve, accessed under the seat, and applied vacuum. Whacked the valve and heard it pop open! Buttoned everything up and went to the station and filled up without the pump clicking off! Victory! If it happens again, at least I know where the problem is...
    bglz42 can you share which part is considered the "rollover valve" in the diagram shared by KellyfromVA. I'm guessing it's #4, #5, or #7 (although #7 isn't really a valve). Also, do you think it was necessary to have the vacuum applied while whacking it?
    Last edited by blaked; 03-14-2019 at 01:35 PM.

  9. #17
    Senior Member bglz42's Avatar
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    I whacked the top of 5. And no, the vacuum was just for test to see if it would flow air...
    2013 Abarth Cabrio Bianco/Grigio (Totaled, RIP) 2013 Abarth Cabrio Bianco/Nero, 2001 Boxster S

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