good day everyone

Have a 2007 L320 TDV8 and its intermittently hard starting. Noticed that there was air ingress coming out the Fuel line from the tank. While fuel gauge is in 3/4.

Is there a way to calibrate the fuel level gauge? Loaded 4 liters and car ran.

And does anyone here have the instructions on how to remove and inspect the sending unit?

been searching online but the manuals ive seen have a different chassis and not the same as mine.

here’s a photo of my rear seats removed.

thanks if anyone can help!