1994 Ford Ranger Repair Question
Fuel Pump, or Fuel Pressure Regulator
The diaphragm on the fuel pressure regulator seams to be holding a vacuum well, and isnt leaking any fuel. The injectors dont seam to be leaking off per the test I ran. I have a timing light that I'm going to hook up to it and replace the fuel filter again. Any other suggestions would be helpful.
pinch off the return line to the tank at the pressure regulator and see what the pressure measures.
Symptoms indicates the fuel pressure regulator is faulty.
OK, the pressure went up to about 50psi. Does that explain it?
Yup, that means a bad pressure regulator.
ok, I unhooked the vacuum line off the fpr and the pressure went up to normal operating pressure 35-36 psi
35-36 psi is at lower edge of specs but vacuum line should be attached.
that is normal. with no vacuum, the pressure should rise.
put a brand new regulator on it with no change in results it seams the regulator works properly without a vacuum line hooked to it.?????
with vacuum, it will lower the pressure. thats normal as i said before.
what kind of pump did you use??
the name brand on the pump is airtek.
now the truck is getting 26psi @ idle but if I give it a little more throttle, the pressure goes up to 36psi. naturally a higher rpm is going to require more volume @the same pressure correct? so, does that mean the regulator is operating correctly? maybe the old regulator was bad and i just need to take it for a spin and see what happens in stead of looking at the pressure gauge.