They don't have a fuel pump in the tank, only the high pressure pump under the bonnet.
seriously don't change anything until you have had the timing set!
Do you know the history of the engine?
Has the cambelt been changed?
Has the fuel pump timing belt been changed?
has it always done this?
for how many miles?
has it got worse?
have you let anyone loose on it?
does it sound right when it is running?
What colour smoke at idle?
Does it smoke lots under heavy acceleration?
does the exhaust smell when running?
these things will help to rectify the issue
