Question - Fuel rail pressue sensor

[Pat]

I sometimes get a CEL announcing a Fuel rail pressue sensor fault. It's intermittent and clears with my X-cal tool. My sensor was changed - no help. I do have an aftermarket fuel pump and my turner say's that's the reason. He changed the tolerance settings in the PCM. Helped a lot but didn't totally eleminate the problem. I don't know if the pressure is too high or too low or just a spike.

My question is: Does it matter? Is the sensor changing the fuel flow from normal to a preset fault condition setting? Or simply reporting a condition and life goes on as usual.

Thanks,

Pat

[martyo]

Shouldn't be happening.

[ctrlraven]

What code do you get?

Twice last year I got some code right after starting my car up , I forget the actual code but had to do with the sensor reading too high of a psi beyond the set number in the parameters of the tune.

[Blown3.8]

Like Marty says, shouldn't be happening. I would pull the pump and make sure all the clamps are tight. And maybe change the filter.

[RacerX]

Like Marty and Chris says, shouldn't be happening. The PCM learns FP voltage vs. fuel pressure and makes it's learned table accordingly.

[Vortech347]

Those sensors do take a crap every now and then and do all sorts of weird things. I carry a spare in the Marauder and our Terminator.

[martyo]

Those sensors do take a crap every now and then and do all sorts of weird things. I carry a spare in the Marauder and our Terminator.

A bad FRPS can not only cause weird effects it can damage a motor.

[RacerX]

Here's an exapmple of a blown FRPS. When the pressure disk blows, you get 39psi of fuel pushing into the FRPS vacuum line for as long as the ignition is on. Doom's car after the 13th engine:

qifKlCi5y3c

[burt ragio]

Here's an exapmple of a blown FRPS. When the pressure disk blows, you get 39psi of fuel pushing into the FRPS vacuum line for as long as the ignition is on. Doom's car after the 13th engine:

qifKlCi5y3c


Bill - I can remember you talking about a better type of fuel pressure sensor disc used to replace the stock disc. Also perimiter settings in a tune to correct this code. I did a search but could not find.

[Pat]

Thanks guys, the code is P0190 sometime P0191 is associated with it. I clear the code with my XCal and it goes away for a week or a month or even longer, but it invariably returns. The sensor has been changed twice and the fuel pump once. The pump comes with the S/C kit from DR. Replacement pump also.

This started after the S/C install and was really frequent. DR updated the appropriate file to loosen the tolerance but didn't totally eliminate the problem.

My fuel filter is changed every 15K miles and currently has Zack's big filter mod.
The Pump was replaced about three years ago. The problems has reared it's ugly head since 07.

The car doesn't exhibit the symptons shown in Racer X's last post. (not sure if this is a funny or not)

My last dyno tune didn't indicate fuel problems, made 400 HP with 39 LB injectors.

Marty, I'm planning on coming to your shop in September in conjunction with Marauderville, maybe we can look at this. Local shops don't want to talk about a modified Marauder. I don 't trust them anyway.

[ctrlraven]

P0190, that's the same code I've gotten before. From what I remember some said it was a badge of honor for a NA car. :lol:

[scruff]

Thanks guys, the code is P0190 sometime P0191 is associated with it. I clear the code with my XCal and it goes away for a week or a month or even longer, but it invariably returns. The sensor has been changed twice and the fuel pump once. The pump comes with the S/C kit from DR. Replacement pump also.

This started after the S/C install and was really frequent. DR updated the appropriate file to loosen the tolerance but didn't totally eliminate the problem.

My fuel filter is changed every 15K miles and currently has Zack's big filter mod.
The Pump was replaced about three years ago. The problems has reared it's ugly head since 07.

The car doesn't exhibit the symptons shown in Racer X's last post. (not sure if this is a funny or not)

My last dyno tune didn't indicate fuel problems, made 400 HP with 39 LB injectors.

Marty, I'm planning on coming to your shop in September in conjunction with Marauderville, maybe we can look at this. Local shops don't want to talk about a modified Marauder. I don 't trust them anyway.

it could still be a faulty fuel pump even if its new it still might not be up to par ive had this problem before ended up changein the pump again for another ford gt supercar pump and problem solved

[justbob]

Every F.I. Marauder I know of throws that code once a month. Besides Jake, I have yet to hear of an issue.


Self proclaimed Builder Of Badassery.

[sailsmen]

Your tuner needs to change the parameters. Keep ignoring it and you may not know what code is being thrown, which you may regret.

[TFB]

Every F.I. Marauder I know of throws that code once a month. Besides Jake, I have yet to hear of an issue.


Self proclaimed Builder Of Badassery.

Mine never never threw the P0190 till one of the in tank FP became disconnected, after the repair never another issue while I owned it...

[martyo]

Marty, I'm planning on coming to your shop in September in conjunction with Marauderville, maybe we can look at this. Local shops don't want to talk about a modified Marauder. I don 't trust them anyway.

That is great news.

We can and will fix the car up for you.

[03sport007]

Just for reference I've been supercharged for almost 15k miles of Dailey driving and never thrown that code.

[RacerX]

Bill - I can remember you talking about a better type of fuel pressure sensor disc used to replace the stock disc. Also perimiter settings in a tune to correct this code. I did a search but could not find.

Hey! Right here: http://dagostinoracing.com/index.php?route=product/product&product_id=13875
I'll post the change in parameters in the tune below this later.

[BODYMAN]

1st 2 FI MM's of mine fliped that code every couple months. Never once was it a bad FRPS. Now if I drove like Doomie then I probably would have blown a frps ;)

[tbone]

I smeared a little RTV on both male vacuum ends and have not thrown a code since.

[Vortech347]

A bad FRPS can not only cause weird effects it can damage a motor.

Yup, reason for carrying a spare.

[JohnE]

I haven't lost at Fuel Rail Pressure Sensor yet or had problems throwing those codes. Proper setup and tuning is important.

I use a Ford GT single pump with a boost-a-pump using a pressure switch to activate on boost. The boost-a-pump should be wired properly as well. Place it before the fuel pump driver, which allows the computer to get a better control signal. Many people just cut the wire between the fuel pump driver to the pump and have the boost-a-pump between, that causes problems like you are having.



John