Wales
by Joske Vermeule, September 1
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Jun 14th, 2026
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Joined: Aug 2020
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Talk Morgan Regular
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Thanks for this John. Still lots to learn with using this forum 😂
2004 Series 1 Roadster
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Joined: Apr 2016
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miles of smiles Talk Morgan Expert
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miles of smiles Talk Morgan Expert
Joined: Apr 2016
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I dare say if you bypass that valve and just connect the pipes, that would prove if the valve is defective or not, it’s only air in the pipe (unless the car is upsides down).
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Joined: Aug 2020
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Talk Morgan Regular
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I dare say if you bypass that valve and just connect the pipes, that would prove if the valve is defective or not, it’s only air in the pipe (unless the car is upsides down). Think I've now planned my weekend now. I don't get any warning light from the ecu so I'm going to blow through a few pipes to make sure there are no blockages. I'm beginning to understand how the EVAP system works from googling, but because fuel evaporates I can't find any reason why the whooshing sound when opening the filler cap, can't be the fuel tank venting into the filler hose. I assume there is no one way valve from the filler, into the tank.
2004 Series 1 Roadster
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Joined: Feb 2010
Posts: 1,415
Has a lot to Say!
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Has a lot to Say!
Joined: Feb 2010
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For me it was the split fuel tank that came first, and once the new tank was fitted the hissing of air when opening the fuel cap developed worse. Some occasions I was even sprayed with petrol. ![[Linked Image]](https://tm-img.com/images/2019/03/22/05A3B410-5269-4DFA-BB9C-F8B15E92E12B.jpg) This is where the roll over valve was repositioned. ![[Linked Image]](https://tm-img.com/images/2021/03/09/098893D1-C59E-45C0-875C-9190E07FAF05.jpg) The standard cars don't have a rollover valve like that Craig. That's a modification by the dealer....
Simon @ Sifab.co.uk
Sifabtemporary@gmail.com
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Talk Morgan Enthusiast
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Shouldn't the open end of the rollover valve be connected back to the EVAP charcoal canister??
Otherwise it's venting to atmosphere.
Bob
2009 Black Roadster
1999 4/4 2 litre Zetec
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Update regarding the hiss. I've ordered a refurb kit for the filler cap from ceandess and waiting for it to arrive. I have since solved the issue of the hiss. I dismantled the locking mechanism from the cap, as when I pressed on the lock barrel, the hiss got much louder. After refitting everything back together, and making sure the o ring that goes around the lock barrel was properly seated, the hiss stopped and has never returned. I'm assuming it was just a natural escaping of gas from the fuel as it slowly evaporates. It certainly wasn't a huge rush of gas escaping.
2004 Series 1 Roadster
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Joined: Mar 2017
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Talk Morgan Expert
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Talk Morgan Expert
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[quote=Craig Jezz]For me it was the split fuel tank that came first, and once the new tank was fitted the hissing of air when opening the fuel cap developed worse. Some occasions I was even sprayed with petrol. This is where the roll over valve was repositioned. The standard cars don't have a rollover valve like that Craig. That's a modification by the dealer.... [/quote This is how it looks now ![[Linked Image]](https://www.tm-img.com/images/2021/07/02/50CE2526-115D-46C1-9E93-BE394A1928D5.jpg) ![[Linked Image]](https://www.tm-img.com/images/2021/07/02/8E40513D-4810-4AE5-B08D-4AA2225B4726.jpg)
Last edited by Craig Jezz; 02/07/21 05:42 PM.
Craig Jezz
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