Isuzu 3.0 Thairung 2004 I think
 

Hi all :)
got a strange problem my fuel needle was showing empty after filling so drove for a while see if it settled but it didnt, I know I have about half a tank of diesel in it yet it shows empty,yet if I take the fuel cap off and put back on it goes to full ? If left over night it returns to empty,anyone have any suggestions ? faulty fuel cap,broken sender unit? fuel pump I have no idea Im in Thailand if that makes any difference (common faults with Thai versions ?)