I have a 1990 ford sierra GLS, 2.0L,

the lastg day the fuel hand dropped way below the minimum level, and then later returned to half full where it should have been, but the needle has since dropped to the very bottom again.

i checked fuses incase it might have been that but no sign. anyone any idea or is there any common faults with these, maybe a wire loose or something somewhere?????????

any help would be great!

Thanks in advance