fuel presure and flow

This test was done on a 4a-fe.Before these test can be caried out it is inportant to know where the fire extinguishers are i only found one wich was located on the lefthandside of the door when you are entering the room.The presure specifications on this engine was 38-44psi.When i caried out these test i used psi for all my  pressure readings.The first test i did was to measure the fuel presure with engine at idling and got a result of 36 psi the engine had a gauge for this so just had to read the gauge to get a result.Next test was to use a speacial clamp given to me to clamp the fuel return for a short while and get the reading.I got a result of 89psi.My next test was to disconect the wacuum line going to fuel regulator and record reading.I got a result of 45psi.I had to turn the engine of and watch the reading after 5 minutes I got a result of 40psi.It is inportant to know the vehicles fuel presure because it can give you a indication of what is wrong with your car and if your car is smoking it mitght be because it is running rich then you will be able to check this if you find owt your fuel preasure.When a car has got low fuel preasure it could have a leak somewhere in the fuel system that is causing this.When the car has got high fuel preasure it could be caused by a block in the fuel lines and this could also cause it to leak because it is getting to much presure and could cause it to run rich.When the car has a faulty fuel regulator this could be caused be diferent things depending on what is wrong with the regulator.If the regulator is stuck open it wil have a low fuel preasure and have same symptons and when stuck closed it will have a high fuel preasure.When the car has low fuel flow it can run a bit lean and feel like there is a lack of power this could be caused by a dirty fuel filter or a faulty fuel regulator