Interesting MOT fail

[Stratman]

My W203 failed its MOT this morning because the Solo Diesel misfuelling device doesn't have a proper seal and effectively vents the tank to open air. Luckily I had the original cap in the boot and, to quote the tester, "That's the quickest repair I've ever seen."

Another year of motoring, although the rear subframe mountings and flexible rear brake hoses were advisories.

 

[Skd884]

My W203 failed its MOT this morning because the Solo Diesel misfuelling device doesn't have a proper seal and effectively vents the tank to open air. Luckily I had the original cap in the boot and, to quote the tester, "That's the quickest repair I've ever seen."

Another year of motoring, although the rear subframe mountings and flexible rear brake hoses were advisories.

Rear flexi hoses are cheap from cp4l i replaced them on my 202 c43.

 

[Petrol Pete]

The flexi hoses were an advisory ? Is your car still on the original solid rear hoses ? They are usually corroded by now , tricky to see as they go over the subframe but an easy spot for an MOT tester.

"Rear sub frame mountings .." I assume he means the 4 big elastomers that run through the subframe . Big job that .

 

[colinallcars]

The flexi hoses were an advisory ? Is your car still on the original solid rear hoses ? They are usually corroded by now , tricky to see as they go over the subframe but an easy spot for an MOT tester.

"Rear sub frame mountings .." I assume he means the 4 big elastomers that run through the subframe . Big job that .

Isn’t that pipes rather than hoses?
I’ve had an advisory for the past couple of years because the ferrules on the hoses are showing signs of rust.

 

[BTB 500]

My W203 failed its MOT this morning because the Solo Diesel misfuelling device doesn't have a proper seal and effectively vents the tank to open air. Luckily I had the original cap in the boot and, to quote the tester, "That's the quickest repair I've ever seen."

I thought all fuel tanks (petrol & diesel) were vented anyway

That's an interesting widget, but wouldn't it potentially trap water/dirt that got past the filler flap ... which the pump nozzle would then push straight into the tank? I think I'd want some sort of cap on it.

 

[Stratman]

The advisories specifically mentioned the flexible hoses, the subframe mentioned corrosion but not serious. Yet. I think at twenty years and a paltry 130,000 miles it's time to stop spending big money on it, especially as although I'm not in Comissar Khan's ULEZ I'm only about 500m from its southwestern boundary.

Time for a Fiat Panda. Or a Giulietta. Or a ...

 

[BigJase88]

I thought all fuel tanks (petrol & diesel) were vented anyway

That's an interesting widget, but wouldn't it potentially trap water/dirt that got past the filler flap ... which the pump nozzle would then push straight into the tank? I think I'd want some sort of cap on it.

View attachment 141069

Yeah my thoughts too. Fuel Tanks are vented anyways

 

[ChrisHGTV]

I thought all fuel tanks (petrol & diesel) were vented anyway

That's an interesting widget, but wouldn't it potentially trap water/dirt that got past the filler flap ... which the pump nozzle would then push straight into the tank? I think I'd want some sort of cap on it.

View attachment 141069

I had a similar flap thing on my old Mondeo. If you wanted to add an additive to the tank you had to use a special funnel in the tool kit that held open the flap while you poured the stuff in.

 

[Stratman]

I vaguely remember something about tanks being vented through a filtration or absorption system to stop deadly vapours polluting our sweet air. An effectively open filler cap would bypass all this.

 

[Petrol Pete]

The advisories specifically mentioned the flexible hoses, the subframe mentioned corrosion but not serious. Yet. I think at twenty years and a paltry 130,000 miles it's time to stop spending big money on it, especially as although I'm not in Comissar Khan's ULEZ I'm only about 500m from its southwestern boundary.

Time for a Fiat Panda. Or a Giulietta. Or a ...

Citizen Khan is coming for you.........

 

[Petrol Pete]

On some cars you hear a 'whoosh' when you open the fuel cap as pressure is released , some cars will not run properly if the fuel cap is missing , many Ford cars don't even have a fuel cap (Hire car knowledge ) just a flap the fuel nozzle pushes out of the way during re fuelling.

Someone on here will be able to explain all of this stuff

PS It appears the device the OP has shown us can simply be unscrewed just like a fuel cap , kind of defeating the object of it .

 

[ALFAitalia]

Petrol tanks are not vented to the air these days.....hence the woosh when you open then on hot day. Most vent to a cannister full of carbon...which at suitable times is released via a tube to be burned off via the intake. They have been like that quite a while....this is the evap carbon cannister from a 211.

 

[BTB 500]

Petrol tanks are not vented to the air these days.....hence the woosh when you open then on hot day. Most vent to a cannister full of carbon...which at suitable times is released via a tube to be burned off via the intake. They have been like that quite a while....this is the evap carbon cannister from a 211.

There must be a way to let air *in* though, otherwise you'd get a vacuum developing in the tank as fuel was taken out on a long run?

Not aware of any of our current vehicles 'whooshing' when you open the filler cap in hot weather, although I've certainly experienced this in years gone by.

 

[Stratman]

A long time ago I had a Daimler V8 (mk2 Jag shape). On a long motorway run it wouldn't pull above about seventy and would even misfire. When I stopped to fill it up and removed the filler cap I could hear the tank unbuckling I had a look around and found a small diameter rubber breather tube exiting in the rear wheelwell. The end was blocked with mud so a quick prod and poke later I was on my way with much better performance.

 

[Bellow]

There must be a way to let air *in* though, otherwise you'd get a vacuum developing in the tank as fuel was taken out on a long run?

My EVAP canister has a port on top marked AIR which presumably fulfils the above requirement and presumably other canisters have a similar port to atmosphere.

 

[ALFAitalia]

There must be a way to let air *in* though, otherwise you'd get a vacuum developing in the tank as fuel was taken out on a long run?

Not aware of any of our current vehicles 'whooshing' when you open the filler cap in hot weather, although I've certainly experienced this in years gone by.

The whoosh is under pressure....not vacuum...

 

[BTB 500]

The whoosh is under pressure....not vacuum...

Yep I get that ... just saying I don't think I've heard it on any of my vehicles for a long time (decades?). Which is why I assumed the tanks vented to the atmosphere (even if through some kind of filter), preventing the pressure buildup in hot weather.