Regulator issues
I have the fitech model 30003 on my 67 Mustang. I have switched to an in tank Spectra premium SP169A1H pump. When I turn the key on, the fuel pressure reads 35 to 40 psi. I have disconnected from each location between the tank and the throttle body and with a good fuel pressure gauge I get at or very near 100 psi. When I reconnect to the throttle body and turn on the key it reads 35 to 40 psi again. I am using the fitech oil filled gauge. I'm unsure of what else I can do to check further. I have also checked vacuum connections to make sure they are secure.
Do you have any ideas on what to check now? I haven't driven the car just idled and revved the engine while parked. I don't feel any stumble at this point.
Your help and input would be greatly appreciated.
Richard Hood.
That unit should have 44 psi constantly. I would look to see if some trash got into the regulator.
According to fitech the regulator is on the throttle body. Where is it located and I'll look.
Another alternative is to do what I did and block off the fitech return line port and use an external regulator with return line to control your fuel pressure directly to the fitech fuel inlet, then you could make the pressure whatever you want. I had a different problem in that my fuel pump had to be running continually with the key on, since it couldn't use PWM according to the manufacturer. Also my fitech internal regulator malfunctioned by preventing fuel from flowing back to the tank, causing my pressure to be the same as the inline fuel pump rating. Also I wanted to bump up my fuel pressure to 58 psi to make full use of my mean street 800 to nearly 1000 hp. The external regulator solved all these problems.
Quote from daddyohood on March 8, 2019, 7:34 amAccording to fitech the regulator is on the throttle body. Where is it located and I'll look.
Passenger side of the unit with the vacuum hose attached.