I think QRB500160PMA superceded the original part number mtc3499 but I may be wrong?

model and age?

If it continues (as mine does) park facing down hill (as I do!), until you find it!

what @julianf said. may not see leaking fuel but air might be getting in along the lines somewhere. I have exactly the same problem right now!

Could just be a leaking fuel pipe

in fact, you don't have to clean it at all!

and you get a free shower when it rains!

https://www.johncraddockltd.co.uk/land-rover-defender/defender-90-and-110/parts/axles-and-transmission/ftc840-oil-seal-stub-axle-outer-90110-1994-to-axle-20l77036c-rhd-and-21l56452c-lhd-disco-1-to-ja0328491-rrc-1986-to-ja624516.html...

notice there is a key-way on the top one and a flat on the second one. which one have you got?

acoording to lrdirect the "FTC5268 fits a 24 spline axle in Land Rover Defender Discovery 1 & Range Rover Classic 92-94". must be a spline quantity thing!

yes, then its deffo FTC840. i think the grooved side goes over the bearing but it's been a while!

just to be clear (as it's been a long day!) are you talking about the front stub axle the wheel bolts on to or the swivel pin housing stub axle?

don't think so:

not sure if that's a 300tdi. the first one i sent is

Or

front or back?

I pay about £190 a year for my 1995 300tdi 110 through Adrian Flux but that's just for regular insurance not classic. Not sure if it's old enough for classic but it might be?

Apparently (but I have no way of confirming this, it's just what I've heard) its a MoT failure if your tyres touch the chassis or any metalwork? Again, only heard this on FB ;)

It was adjustable but I didn't fiddle with it too much. I remember what you said about it not to be under tension and using the top hole did just that! I did replace the latches with decent ones but I guess over the years they just eventually need some oil!