Fuel Pressure and Flow on a petrol car

This time we decided to use Unitec's car in case if we burn something... But nothing terrible happened. Anyway when working on fuel systems of the car everyone must take care of any flames, sparks and open fire around vehicle, not even welding around the corner, must avoid battery loose terminals as the can make a spark as well. And make sure you know where is fire extinguisher located as in case of emergency lots of people forget about it. Our one at the classroom and let it be there.

Our specs for fuel pressure nobody knew so we took roughly guess of 200 Kpa at idle and around 400 Kpa at full throttle. We hocked up fuel pressure gauge to Nissan Primera 1992 with SR20DE engine and Steve done a mistake as he hooked it up back to front, anyway we fixed it and here we are, no leaks.
After we finished test plugged back all original fuel lines and checked for leaks, no leaks were found.

Its very important to test fuel system as it can give all sort of problems and when faulty under high pressure can split the hose and catch a fire from hot engine.

If the fuel pressure low it could work ok at idle or low speeds but if you put foot down it can only reach certain speed, had a torque lags at high RPM's range.

Low fuel flow can indicate work fuel pump and it will effect high range RPM's and performance.

High fuel pressure will make car run rich at low RPM's range and idle, black smoke at idle from exhaust, fuel economy would be lost and plenty of HC hydro-carbons will be produced making our world even worst by polluting.

And faulty fuel pressure regulator will make pressure ether High or Low constantly.