Fuel cap leaking

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Fuel cap leaking

Post by Miniman on Wed Jan 17, 2018 2:36 pm

Hi everyone,

This is my first post so I'm hoping someone can help.

I'm having a few issues with the van but the most noticeable is a leaking fuel cap. Last week we filled the van up with fuel, took it for a short journey and when we got home it was leaking quite badly from the fuel cap and down the side of the van. When we went to removed the fuel cap it was like opening a bottle of shaken up coke and more poured out.

Since then we have replaced the cap with one off ebay (remake) and drained the fuel to 3/4 of the tank. Still having the same issue. Any ideas whats going on. I'm used to old fords not hijets so this is all new to me Very Happy

Thanks in advance everyone
Sam

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Re: Fuel cap leaking

Post by PFM on Wed Jan 17, 2018 3:03 pm

Sounds like the tank is getting pressurized somehow, no idea why but others will. Might be helpful to know if it's petrol, diesel or LPG that's getting spewed out.

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Re: Fuel cap leaking

Post by Miniman on Wed Jan 17, 2018 3:24 pm

Hi, thanks for the speedy response. Its a HI-JET 1300 16V EFI, T reg 1999, petrol hope that helps.

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Re: Fuel cap leaking

Post by Woodie on Wed Jan 17, 2018 7:37 pm

You might like to change your name to Micro van. BMC is an offensive Marque on here, but Ford - that is my background. Biggest Ford Spares Specialist on the Isle of Wight and then Skoda and since 2003 Hi-Jet.
Fuel tank isn't likely to be getting pressurized as it actually runs with a Vacuum in it.

When you turn the engine off and open the Fuel cap are you getting an inrush of air. You should have a air intake noise. If not then it can mean you have a rusty metal pipe on the top of the tank or a perished rubber vacuum pipe, once again, on top of the tank. Either way it is likely to be a drop the tank down job to investigate.
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Re: Fuel cap leaking

Post by Woodie on Thu Jan 18, 2018 12:09 am

In the base of the Filler pipe where the Rubber Hose joins onto the filler pipe is a plastic Butterfly Valve which allows the incoming petrol through to the tank, but stops fuel from the tank surging back up the filler neck.

When the flow from the Petrol Pump Nozzle stops, the Butterfly Valve should spring shut, but sometimes the two half flaps get stuck or the spring holding the flaps shut has broken. I expect this is your problem.

It is easy enough to remove the Butterfly Valve by un-doing the Jubilee Clip on the Rubber Hose and removing it from the Filler Pipe. The valve is in the bottom of the metal filler. If it is broken then I have some in stock.
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Re: Fuel cap leaking

Post by PFM on Thu Jan 18, 2018 9:25 pm

Woodie wrote:BMC is an offensive Marque on here
Huh? Since when? BMC is part of my background, so Miniman can stay!

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