After you turn of the engine how fast fuel pressure drops? It needs to remain at >2.5 bar after 30 minutes.yes ,it cranks over,but won't fire ,and no codes.Is their a pressure regulator in line of fuel filter? thanks for any help. oh BTW replaced battery few months ago. I put pressure tester on fuel rail , and turn key off and on just to hear fuel pump ,after 6 or 7 th time it has 40 to 50 psi, then starts ok,the problem is not enough fuel pressure at fuel rail.