I have a 1958 DHC, believe it has a 140 tank but not sure how to verify (and can't get it up on a lift right now as it's sandwiched in the back of my garage). Does anyone have photos from under their car that would help me identify if I have a 140 or a 150 tank. Please don't tell me to look for the breather pipe - I can't see one but I'm also not sure if I'm looking in the right place (my viewing access is from the left rear tire well).

Thanks in advance for any assistance.

 

you might find something helpful here:
Jaguar XK150 OTS Restoration: Jaguar XK 150 Fuel Tank