I need some help.working on my sister in laws 2007 Ford explorer with a 4.0L.it has a crank no start issue.we replaced the fuel pump and added 5 gallons of gas but the gage won't read it now.still a crank no start issue.i haven't looked into a whole lot but will hook my scanner up tomorrow to look at any possible codes and read pressures and so on.just looking for suggestions or ideas on what could be the problem?