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Topic Review (Newest First)
03-16-2013 11:37 PM
danny42984 Bought the fuel rail sensor and pressure is back to normal and car runs good again. At least for now. I hope there is nothing else wrong that caused the sensor to go bad. Thanks for all the replys and help! Hopefully this thread will help others as well.
03-16-2013 01:25 AM
1turbofocus
Quote:
Originally Posted by danny42984 View Post
I will check it. I think I may just buy the fuel rail sensor and see if it fixes it. I really dont know what else it could be If the one under the seat checks out. If the fuel pump had low pressure I could see it being the pump but with it being high I doubt it...I just think something is "telling" it to put out more pressure. Correct me if Im wrong cause I'd rather keep checking stuff instead of buying $120 sensor I cant return.
Junk yard or a local guy you could test swap them with ?

Tom
03-15-2013 10:10 PM
gurkpimpin Check your coil pack

Sent from my SPH-D710 using FF Mobile
03-15-2013 09:52 PM
danny42984
Quote:
Originally Posted by 1turbofocus View Post
Voltage output , to have that high of fuel psi the voltage should be 12+ volts , check the ground as it is the controlling voltage wire

Keep in mind the fuel rail psi sensor could be bad telling the pump to add more psi , one tells the other what to do

Tom
I will check it. I think I may just buy the fuel rail sensor and see if it fixes it. I really dont know what else it could be If the one under the seat checks out. If the fuel pump had low pressure I could see it being the pump but with it being high I doubt it...I just think something is "telling" it to put out more pressure. Correct me if Im wrong cause I'd rather keep checking stuff instead of buying $120 sensor I cant return.
03-15-2013 07:01 PM
FocusRus Well, that just about settles it then. With the ecm seeing 19psi-when actually the pressure is over 80 at spike, all roads lead to the fuel pressure sensor. Tap on it while observing the fuel pressure reading....of coarse you'll need an extra set of hands for that one.
03-15-2013 06:45 PM
1turbofocus Voltage output , to have that high of fuel psi the voltage should be 12+ volts , check the ground as it is the controlling voltage wire

Keep in mind the fuel rail psi sensor could be bad telling the pump to add more psi , one tells the other what to do

Tom
03-15-2013 05:49 PM
danny42984
Quote:
Originally Posted by 1turbofocus View Post
You are correct , altho my knowledge of the SPI engine is very limited , the fuel rail psi sensor is what what tells the ecu what the fuel rail psi is , if its bad this may also be why your reader was showing low but I have never seen that

You might (Focus Zetec and SVT does) have a fuel pump driver module under the rear pass seat that sends the voltage to the fuel pump , I would also check this

Tom
Thanks for the reply! What would be the best way to check the fuel pump driver module?
03-15-2013 05:40 PM
1turbofocus You are correct , altho my knowledge of the SPI engine is very limited , the fuel rail psi sensor is what what tells the ecu what the fuel rail psi is , if its bad this may also be why your reader was showing low but I have never seen that

You might (Focus Zetec and SVT does) have a fuel pump driver module under the rear pass seat that sends the voltage to the fuel pump , I would also check this

Tom
03-15-2013 05:32 PM
danny42984
Quote:
Originally Posted by FocusRus View Post
It should never be that high! I'll let Tom take this one, though the fuel pressure is not being regulated.....fuel pressure regulator, but is it?.
I would think it would be a regulator for sure on an older non computer controlled car but this..I just dont have the experience on newer cars. Oreilly's auto parts website dont even list a fuel pressure regulator for it. I was thinking maybe it doesnt have one and is regulated by the sensor on the fuel rail?? I lost. Any advise from anyone with more knowlege would be greatly appreciated.
03-15-2013 05:21 PM
FocusRus It should never be that high! I'll let Tom take this one, though the fuel pressure is not being regulated.....fuel pressure regulator, but is it?.
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