Since replacing the fuel pump, which required tilting the tank to gain access to the top hatch, I've got a rattle somewhere in the back of the car. It only happens driving over a rough surface so firstly I thought it was the ns damper but that's OK and it had a new bush recently. So I'm wondering if there is anything between the tank and the bulkhead that I could have disturbed when I tilted the tank that's now loose and rattling?

 

There is an internal valve in the rear factory shocks that can break off, rattle around, and drive you crazy. The shock continues to function normally. This occurred on my wife's 2006 XK8 back in 2014. It took me a couple of months to find the source of the noise. Turned out to be the valve inside the right rear shock. New rear shocks (installed at 99,000 miles) fixed it....

 

Ah, OK, thanks I'll take a closer look. How did you identify it?

 

I read about the issue here on the forum. After taking everything out of the trunk, lubing all junction points of the convertible top frame, and making certain the various rear suspension nuts and bolts were tight, I assumed the noise had to be coming from one of the rear shocks due to the busted internal valve issue. We replaced both rear shocks (it was time to do that job anyway) and voila, no more rattle....

 

OK, my car is just an 8 not an R so no cats dampers.
Since posting I've had the car up in the air and thoroughly checked over everything on the rear suspension, in fact everything I could think of, and nothing is amiss so I'm back to thinking that I must have disturbed something when I tilted the fuel tank to access the pump/sender. Is there anything between the tank and the bulkhead that could be loose now, even I guess between the tank top and underside of the hood stowage recess?

 

OK, my car is just an 8 not an R so no cats dampers.
Since posting I've had the car up in the air and thoroughly checked over everything on the rear suspension, in fact everything I could think of, and nothing is amiss so I'm back to thinking that I must have disturbed something when I tilted the fuel tank to access the pump/sender. Is there anything between the tank and the bulkhead that could be loose now, even I guess between the tank top and underside of the hood stowage recess?