MartyCee

Hi There,


I was wondering if anyone else has come across this problem.


I have rebuilt my '78 928 K-Jet fuel distributor, Warm up regulator and fuel pressure regulator.


When I set the test guage to measure system pressure, I get a nice 75~80 psi which is in the correct range, so I assume the fuel pressure regulator is working ok.


However when I turn the valve to measure the control pressure, it goes to about 40psi, and then suddenly the pressure fluctuates between 10 and 100psi at a rate of maybe 10 times per second, which makes a terrible racket and I'm sure it's not good for my poor guage...let alone the rest of the system.


I have the entire system on the work bench to try and make it easier to work on, which means I'm using just a pump, no accumulator straight into FD and all the injectors connected as well as WUR, with return hose going back to fuel can. Would the lack of the accumulator cause this?


I look forward to your response.


Cheers
Marty

GlenL

The function of the accumulator is to smooth the pressure pulses from the pump. Perhaps what you're seeing is exactly that and an accumulator will address this.

You've got the return lines working and not plugged off?