To check your fuel systems for leaks is fairly simple.
1 Get fuel pressure guage connect to fuel rail fitting. Prime system by turning ingnition on. Should be a 3 sec. prime. Pressure should hold.
2 If not plug return line to tank easiest place is a regulator connection if it holds regulator is notleaking to tank. If it drops disconnect vacumn hose to see if fuel is leaking through it to intake, if not the leak is not at the regulator. To further check regulator operation start engine observe pressure should 39 to 45 with engine running disconnect vacumn hose presure should increase 6 to 8 ILBs with factory regulator.
Injectors can leak into port due to binding pintle in injector due to wear or carbon deposits, some cleaners will work on the carbonized injectors but won't fix worn out injectors.
I have also found that Ford injectors orginal and FMS replacement in jectors do not like excessive pressures, and will heat up causing them to cause engine miss at times. Ford injectors have pintle design and are prone to this condition Bosch style with disc instead pintle design are far superior in design and reliabilty.
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