Filled her up full the other day when rather hot.
Following morning whilst wife driving it just cut out. On my arrival started okay headed home , one little hiccup and fine. I drove day after still fine. BNext occasion coughed like misfiring. Now I wondered as it sounded like fuel starvation so took filler cap off large whoosh of air so was definitel vacumm in tank. Same this morning when it died. Once cap released again a whoosh and runs ok.
I have read here about fuel tank problems but am I look past the obvious?

Fuel filter most likely.

Loads of posts on here about non-original part fuel filters failing.

The original fuel cap on my FL2 also had the same problem, huge 'whoosh' when the cap was released, sometimes needed a bit of effort just to release the cap. Bought another fuel cap and problem solved. The only difference that I could see between the two was that the new cap had purple coloured pastic around the centre piece 11 GS Bali Blue
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TooBlue wrote:

Fuel filter most likely.

Loads of posts on here about non-original part fuel filters failing.

768will wrote:

The original fuel cap on my FL2 also had the same problem, huge 'whoosh' when the cap was released, sometimes needed a bit of effort just to release the cap. Bought another fuel cap and problem solved. The only difference that I could see between the two was that the new cap had purple coloured pastic around the centre piece

Almost certainly the filler cap valve is not doing it’s job.

Plenty of info here.

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I have a petrol engine & the pump & filter are in the tank, which I think gets changed at 90,000km. The fuel cap has always made a solid in rush of air everytime I take it off. I have noticed that with a lot of dusty outback roads some of the dust has worked its way through the fuel filter cap, so it might need cleaning.

I haven't got a photo of inside the cap, but here is the level of dust around the filler which I always blow off before opening the tank.
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My I think you need a filter before you put fuel in

Badger51 wrote:

Almost certainly the filler cap valve is not doing it’s job.

Plenty of info here.

https://www.freel2.com/forum/search.php?se...rch_time=0

Was okay for a couple of days did around 50 odd miles then started cutting out. Managed to get home. Would not start, turns over ok, with reduced endgine performance warning. No OBD codes. Evenyually out of the blue started and ran okay. Other posts mention crankshaft position sensor but I would have thought if that was faulty would not be intermittent.
Anyway have just changed fuel filter so will see.

Well after changing filter still got problems. After changing filter went for a spin. It lasted about 1/2 mile then just cut out. Restarting turns over but that is it. Took fuel tank supply hose off turned her over no sign of diesel. Try a few more times , starts I get home keep her running then remove fuel supply hose plenty of fuel coming out. So we diagnose this as a faulty fuel pump? I would not but I am no expert. So on getting back home leave her idling and she cuts out after 10 minutes. Restarted and has now been idling for over an hour.

There are 2 fuel pumps. One in the tank moving fuel from one side of the saddle tank to the other. It only keeps the tank end of the fuel line submerged in fuel.
The other pump, the high pressure pump on the camshaft, once primed, sucks fuel from the tank through the filter and supplies the fuel rail with pressurised fuel. What isn’t used recirculates to the filter, and returns to the tank.
The fuel that returns to the filter has a warming effect and a sensor, that is not always copied in pattern filters, can be the cause of the engine cutting out.
While I’ve had a vacuum at the fuel filler, it’s rare and I recently travelled from Southwaite Services on the M6 to Lochgilphead (via the short 55 mile detour for Rest and be thankful so about 240 miles) and filled up with no vacuum on opening the filler.

Only ever used the LR filter . Anyway yesterday did 10 miles in the evening and another 20 odd just now with no problem. All the time with fuel cap just resting on opening now screwed down the 3 clicks. I must now put that on and see if problem occurs. If it does new filler cap needed.