Stock Fuel pressure for 1998 GT?
#1
Low FUel Pressure. Regulator or Fuel Pump?
So the Mustang GT 1998 seems to hesitate once in a while and when ever I go half throttle or so it takes a while to respond. So I checked the fuel pressure at idle and it reads 18 psi. I unhooked the vacuum line to the fuel pressure regulator and the pressure did not go up (Now fuel in vacuum lines btw). Right away I thought the problem was the fuel pressure regulator. But after thinking for a while it got me thinking. Wouldn't a faulty low pressure fuel pump cause the regulator to not raise fuel pressure once the vacuum line has been disconnected since the fuel pump pressure is low and there's not enough fuel pressure to make the regulator work properly?
What do you guys think? Faulty Fuel Pump or Fauly FPR?
Also, whats should the stock fuel pressure be for an 98 GT at idle?
Thanks
What do you guys think? Faulty Fuel Pump or Fauly FPR?
Also, whats should the stock fuel pressure be for an 98 GT at idle?
Thanks
Last edited by redmaro1; 05-14-2010 at 05:02 AM.
#2
This is from the 2000 shop manual, your '98 should be the same:
These are the reference vaues for the fuel rail pressure sensor output voltage (FRP V), and the fuel rail pressure (FRP) in psi.
KOEO = Key On Engine Off
These are the reference vaues for the fuel rail pressure sensor output voltage (FRP V), and the fuel rail pressure (FRP) in psi.
KOEO = Key On Engine Off
#4
Because of that the fuel pressure specs I listed are likely incorrect as they are for the returnless system, which provides much more precise pressure regulation.
In answer to your question, in a retun type system low pressure at idle would be indicative of a bad regulator, or fuel pump. Perhaps someone with a '98 shap manual can provide the pressure specs for your car.
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zanemoseley
2005-2014 Mustangs
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09-06-2015 12:58 PM