I have an intermittent buzzing coming from rear area where the suspension air compressor is
Located. Starts then stops, quiet when I take foot off of
Accelerator and then starts up again when I step on gas.
Has anyone else had this happen?
Thx![/i]

Not had anything like that, but my first guess would be something metal (locking wheel nut, tool something like that) has fallen into the compressor area and is touching it, or its a heatshield around the exhaust come loose or even something like a rear brake disc shield. Current Fleet:-
2018 Discovery 5 3.0 HSE
2021 Ford Ranger Wildtrack
2019 Ford Mustang Bullitt 5.0 V8
1993 Defender 90 200TDI Pickup

Gone - not forgotten
2016 L405 4.4 SDV8 Vogue SE
2012 L322 4.4 Westminster
2004 L322 4.4 V8 Autobiography LE
2000 P38 RR 4.0 HSE (ex Clarkson test car)

Don't suppose it's worth checking the fuel pump? They can get a bit noisy, worth checking it's all attached firmly