View Full Version : Supercharged Fuel Pressure Sensor
Can any one tell me if the fuel pressure sensor on the fuel rail for the Eaton supercharger conversion is the orig, or is it sourced from another vehicle??? I read through the Eaton swap thread and didn't find a answer...
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7/16/11 You won't miss much if you skip directly to page two...
FordNut
06-02-2011, 05:47 PM
It is OEM.
justbob
06-02-2011, 06:19 PM
If all it did is throw a code and you don't smell much fuel at all, then just erase the code and repeat in a month. Mine trips the light every now and then and replacing does nothing.
LANDY
06-02-2011, 06:23 PM
Also if it throws the code at WOT. check you fuel pressure.
Well mine threw a P0190 and I erased it thinking it was cryin' wolf, but code came back and A/F ratio is shooting to around 15.5, so I defiantly have a problem... When the engine is good and hot it makes no difference in fuel pressure with or without vacuum on the sensor... Also I can't get the resistance of the sensor to change with or without vac...
Local Boy
06-02-2011, 08:52 PM
For those who do not have a FP issue, but keep getting FPS codes...You can have your tuner adjust the parameters of the FPS to keep it from throwing constant codes. Now FP spikes remain within the current parameters...poof... no codes...
Worked in my case.
Good luck...
Aloha
blazen71
06-03-2011, 04:22 AM
^^^^^^^^me too^^^^^^^^^^^
BODYMAN
06-03-2011, 07:11 AM
Yep I throw that code about evry 2 months doesnt make a diff if just driving or getting into it. Still throws the code. Its a very confused sensor
RacerX
06-03-2011, 07:23 AM
What do you have for a fuel pump(s) btw? I've found if you tell the tune you have a GT 40 FP, the proportional term by default is 0 and you have big fuel fluctuations. I set mine to 0.01975 and it stabilized across the board.
It has two of the GT pumps running in parallel, so has enough pump and then some...
I've emailed Zack and he said possibly the FPDM(fuel pump driver module) is overloaded with the current draw of the two pumps and suggested a cooling fan for the FPDM, to see if that helped, but made no difference... I'm going to get a FPDM from a '08 P71 a buddy has and try it but not sure it's the same... At this point I'm 90% it's the F/P sensor but hate to buy one and that not be the problem...
BTW all's been fine no issues at all till the CEL popped on back in March, even after I reset it was OK for another month or so...
RacerX
06-03-2011, 08:43 AM
If the tune has the GT 40 pump value file loaded, let your tuner know that proportional term is set to 0 and reloding that single setting to stock may fix it. Dead serious...
http://www.mercurymarauder.net/gallery/data/579/GT40a.jpg
BODYMAN
06-03-2011, 09:13 AM
It has two of the GT pumps running in parallel, so has enough pump and then some...
I've emailed Zack and he said possibly the FPDM(fuel pump driver module) is overloaded with the current draw of the two pumps and suggested a cooling fan for the FPDM, to see if that helped, but made no difference... I'm going to get a FPDM from a '08 P71 a buddy has and try it but not sure it's the same... At this point I'm 90% it's the F/P sensor but hate to buy one and that not be the problem...
BTW all's been fine no issues at all till the CEL popped on back in March, even after I reset it was OK for another month or so...
Considering you had a month between CEL's makes me thing it is the same problem some of us have had. Any driveability issues happening. Its weird my Vortech throws it every couple months have yet to throw that code w/ my 04 Whipple SB maybe Racer is right all in how tuner sets the values?
LANDY
06-03-2011, 09:29 AM
Racerx is correct, my tuner set the values on my previous car and it never came back on unless it had a fuel problem.
LANDY
06-03-2011, 09:36 AM
It has two of the GT pumps running in parallel, so has enough pump and then some...
I've emailed Zack and he said possibly the FPDM(fuel pump driver module) is overloaded with the current draw of the two pumps and suggested a cooling fan for the FPDM, to see if that helped, but made no difference... I'm going to get a FPDM from a '08 P71 a buddy has and try it but not sure it's the same... At this point I'm 90% it's the F/P sensor but hate to buy one and that not be the problem...
BTW all's been fine no issues at all till the CEL popped on back in March, even after I reset it was OK for another month or so...
I know all cars are different, but my car has been running on two inline GT40 pumps for over 3 years with no problem.
To my understanding when the FRPS goes bad the car won't run.
Correct me if I'm wrong.
Dennis Reinhart
06-03-2011, 12:17 PM
If all it did is throw a code and you don't smell much fuel at all, then just erase the code and repeat in a month. Mine trips the light every now and then and replacing does nothing.
You can turn this off in the software
It has a problem, the A/F ratio jumps to 15.5 under boost and fuel pressure doesn't rise... I got a FPDM today from '03 P71 which has same part number as the Rauder, just haven't had a chance too install it.. Also got the fuel pressure sensor still need to compare the numbers on those...
.
From last Aug when I bought it from bazawir till March it was fine, A/F ratio was in mid 11s under boost and never a CEL...
BODYMAN
06-03-2011, 08:52 PM
Sounds like youre on the right track very curious as to what it is.
Well I swapped the pressure sensor and FPDM, no change still having intermittent loss(reduction) in F/P, guess I'm gonna have to monitor the voltage fed to the pumps... If that's OK it has to be a problem inside the tank...
Seneca
06-05-2011, 10:08 AM
Well I swapped the pressure sensor and FPDM, no change still having intermittent loss(reduction) in F/P, guess I'm gonna have to monitor the voltage fed to the pumps... If that's OK it has to be a problem inside the tank... Is your FPDM stock or modified?
LANDY
06-05-2011, 10:13 AM
Well I swapped the pressure sensor and FPDM, no change still having intermittent loss(reduction) in F/P, guess I'm gonna have to monitor the voltage fed to the pumps... If that's OK it has to be a problem inside the tank... of you dattalog the car you should be able to point out the problem.
Dennis Reinhart
06-05-2011, 12:35 PM
Here is what I know, as Landy said the easiest way to pin this down is monitor FP duty cycle, FP voltage and fuel pressure drop across the injector also monitor maf load and counts and RPM. Look for vacume leaks. The marauder is strange, some cars only need a larger pump others need a relay kit and some times a BAP, what ever any one does do not take out the check valve out in the tank this will cause FP to spike and blow a hole in the FRPS diaphragm, I have a Marauder here that has me completely stumped, it was a auction car, with a used motor it is SC and at 9 PSI it is making 245 RWHP it shows 9 PSI it is not running out of fuel but is going lean on the big end, this car came to me in pieces which I hate to finish what some one tore apart, we replace all the intake gaskets I drooped the exhaust I have data logged every thing and it just does not appear, but I have not gave up its some times just takes patients to run these things down we also did a compression check. I am now checking to see if the EGR is stuck open and blowing boost out the exhaust but I honestly do not feel this is the case.
Is your FPDM stock or modified?
Stock, can they be modified for enhanced performance/reliability???
of you dattalog the car you should be able to point out the problem.
You are telling me I need more than a box of carb jets and a screwdriver to fix this??:lol:
Here is what I know, as Landy said the easiest way to pin this down is monitor FP duty cycle, FP voltage and fuel pressure drop across the injector also monitor maf load and counts and RPM. Look for vacume leaks.
I have checked the vac lines and verified vac/boost at the F/P sensor also verified the connector on the sensor is good(dissembled it), but other than the FPDM & sensor I mentioned, that's it(parts were free)...
You are telling me I need more than a box of carb jets and a screwdriver to fix this??:lol:
lol, yeah just swap the carb offa yer big red Cobra and see if it helps :beer:
FordNut
06-06-2011, 04:45 PM
Stock, can they be modified for enhanced performance/reliability???
There are a couple of places that upgrade them. It is basically for reliability. They replace the output driver transistors with higher capacity ones. Not necessary for single pump or twin Cobra pumps, but it is highly advised for twin GT or twin Focus SVT pumps.
There are a couple of places that upgrade them. It is basically for reliability. They replace the output driver transistors with higher capacity ones. Not necessary for single pump or twin Cobra pumps, but it is highly advised for twin GT or twin Focus SVT pumps.
Neat idea, I serviced TVs for almost 40 years and have enough large power transistors laying around that I could do the mod myself, I've had the original apart and saw it just has one transistor and a high current rectifier that handle the power...
FordNut
06-06-2011, 07:27 PM
I think it is a FET but I'm not sure. I think the folks who do the upgrade just install a higher current capacity driver. Might be easy to cross-reference in a ECG catalog.
Well to bring this one back from the almost dead, it's fixed...
Problem was in the tank, second fuel pump had pushed the hose off the "Y" that joins the two GT pumps into one line... Now maintains a high 10 A/F ratio through 1st & 2nd and no more CEL...
LANDY
07-16-2011, 06:01 PM
Glad you fixed the problem, high 10's afr seems a litle rich.
my car is 11.6 , high 10s are really rich and leaving a lot on the table
RacerX
07-16-2011, 08:48 PM
Glad it's working!!! High 10's is rich!
There are a couple of places that upgrade them. It is basically for reliability. They replace the output driver transistors with higher capacity ones. Not necessary for single pump or twin Cobra pumps, but it is highly advised for twin GT or twin Focus SVT pumps.
Yup! Replace the FET, flyback Diode, Capacitor, maybe use a little Artic Silver heat sink compund, do the wiring upgrade. OR just do two FPDMs.
http://www.mercurymarauder.net/gallery/data/579/IMG_0577a.jpg
Glad you fixed the problem, high 10's afr seems a litle rich.
my car is 11.6 , high 10s are really rich and leaving a lot on the table
Glad it's working!!! High 10's is rich!
Yup! Replace the FET, flyback Diode, Capacitor, maybe use a little Artic Silver heat sink compund, do the wiring upgrade. OR just do two FPDMs.
Yeah I realize high 10s is on the fat side, but at least I have plenty of fuel now... :D
I need to check to see which fuel pressure sensor is installed, possibly has the junk yard piece on the rail(from a P71 has different part number), it used to run a 11.3 A/F ratio prior to having the lean out problem...
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