P0190 code

[robertmee]

Does the PCM throw this code for both High and Low Fuel pressure? I have an Aeroforce gauge and started monitoring fuel pressure when I got this code. Normally the FP is around 38 to 40 PSI in general driving. But now I've noticed it sometimes goes all the way to 60PSI! I have a trilogy setup with the booster pump...Is it possible I really have 60 PSI or more likely the FP sensor gone bad?

[fastblackmerc]

Does the PCM throw this code for both High and Low Fuel pressure? I have an Aeroforce gauge and started monitoring fuel pressure when I got this code. Normally the FP is around 38 to 40 PSI in general driving. But now I've noticed it sometimes goes all the way to 60PSI! I have a trilogy setup with the booster pump...Is it possible I really have 60 PSI or more likely the FP sensor gone bad?
The PCM will report a P0190 if the FP regulator is not in the specified range.

Pull off the vacuum hose on the FP regulator and check for a gas smell.

[justbob]

When I had my Trilogy the FPDM was wearing out and overheating. It would climb up to about 58 and drop like a rock into the single digits before stalling out and leaving me stranded for an hour at a time. This only happened in temps over 80-85*


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[RubberCtyRauder]

When I had my Trilogy the FPDM was wearing out and overheating. It would climb up to about 58 and drop like a rock into the single digits before stalling out and leaving me stranded for an hour at a time. This only happened in temps over 80-85*


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was that the stock FPDM? or a Racerx upgraded one. I blew the fuel pump fuse last summer, was not under boost or even hard driving, just cruising in 35 mph area. I changed fuel filter and changed to upgraded FPDM. Still avg. around 30 psi. As you know, my car is at MO's now and they will be looking closer at the system.

[robertmee]

I didn't smell any gas...I picked up another FPS...will slap it on tomorrow but not hopeful that's the problem. The FPDM sounds interesting. My pressure seems to be all over the place...on a 1800 rpm cruise at 45 mph its usually around 40 psi but at times it will jump to 60 psi and stay there. I noticed tonight too that turning off the Kenne bell boost a pump or changing from full rich to full lean on the dial made no difference in fuel psi. Should it?

[justbob]

was that the stock FPDM? or a Racerx upgraded one. I blew the fuel pump fuse last summer, was not under boost or even hard driving, just cruising in 35 mph area. I changed fuel filter and changed to upgraded FPDM. Still avg. around 30 psi. As you know, my car is at MO's now and they will be looking closer at the system.



Stock. My issues were more problematic at idle or slow moving. Under hood temps were ridiculous with the 2.8/+4 pulleys. PCM would call for more fuel to cool the cooked fuel in the lines and after so many times the FPDM would just fail.


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[justbob]

I didn't smell any gas...I picked up another FPS...will slap it on tomorrow but not hopeful that's the problem. The FPDM sounds interesting. My pressure seems to be all over the place...on a 1800 rpm cruise at 45 mph its usually around 40 psi but at times it will jump to 60 psi and stay there. I noticed tonight too that turning off the Kenne bell boost a pump or changing from full rich to full lean on the dial made no difference in fuel psi. Should it?



That adjustment does very little and only for WOT.


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[Zack]

The pcm will raise the fuel pressure when the IAT's get high to prevent boiling. Some tuners set it to 40 at all times, others do not.
It's normal
aka there is nothing wrong

[robertmee]

The pcm will raise the fuel pressure when the IAT's get high to prevent boiling. Some tuners set it to 40 at all times, others do not.
It's normal
aka there is nothing wrong

Interesting....

I did change the FPS...no change in fuel PSI behavior. Still creeping up to 60 PSI, but now what Zack says makes some sense...it's more evident on hot days.

I did notice that while testing after I installed the new FPS, a couple of times, when letting off the gas, the PSI spiked and clamped the meter at 90 PSI, and the car lost about 300 RPM momentarily before evening out.

There's a local member that's going to let me borrow a FPDM just to rule that out. Other than that, not sure where else to look for the P0190 culprit.

[Motorhead350]

The pcm will raise the fuel pressure when the IAT's get high to prevent boiling. Some tuners set it to 40 at all times, others do not.
It's normal
aka there is nothing wrong

Ok good because I get this problem here and there, yet fuel delivery feels fine.

[robertmee]

To follow up...Replaced the FPS with a new one, and borrowed a fellow MM's FPDM and replaced this morning. Downloaded the Ford Driving Cycle routine, and all ready's came on and no codes. So passed inspection. Will probably go ahead and buy a modified FPDM for my trilogy setup.

[fastblackmerc]

To follow up...Replaced the FPS with a new one, and borrowed a fellow MM's FPDM and replaced this morning. Downloaded the Ford Driving Cycle routine, and all ready's came on and no codes. So passed inspection. Will probably go ahead and buy a modified FPDM for my trilogy setup.

Contact RacerX - he modifies the FPDM's.

[robertmee]

RacerX hasn't responded to PMs in regards to a modified FPDM. As for stock ones are there any sources for new ones...Google just turns up used ones on ebay.

[fastblackmerc]

RacerX hasn't responded to PMs in regards to a modified FPDM. As for stock ones are there any sources for new ones...Google just turns up used ones on ebay.

Try sending him an email.

FYI... you might still throw the same code with an upgraded unit as the tune is looking for the stock values.

[martyo]

Try sending him an email.

FYI... you might still throw the same code with an upgraded unit as the tune is looking for the stock values.

What's his email?

[fastblackmerc]

What's his email?

Unfortunately he doesn't have one listed..... my bad.

[robertmee]

So, back to this problem....Happened again yesterday.

I have replaced both the FPS and the FPDM at this point, and still have the same behavior. Yesterday, it acted like this:

95+ degrees out
I was stop/go traffic downtown
Felt the car start to hesitate, and watched the Fuel PSI go from 40+ down to 0 while driving at about 5mph.
Pulled over and car shutoff, threw the P0190 code
Waited about 3 minutes and attempted to crank
Fuel PSI at 0, and then started to slowly creep up over 30 seconds and at about 28 PSI, car cranked
Drove another 200 yards and same thing
Let it sit for about 10 minutes this time
Cranked and now PSI pegged at 90 PSI (range of meter)
Car would run, but I had to keep throttle feathered in Neutral on stops
PSI remained at 90 PSI
Would vary RPM's in Neutral between 900 and 3000 and FP always at 90
My tank was low (maybe a key point), so I stopped and filled up gas
Once I cleared downtown and could get up to speed, FP started dropping back to a normal 50ish
As soon as I let off throttle to coast or slow down, FP would go to 90 PSI
Got to my destination and let car sit for 1.5 hours
Drove home with no problems and FP normal 40 to 50

My setup is a Walbro with KB BAP. Could it be the Fuel Pump is failing? Maybe the low gas is a clue when it started on a hot day? Could the pump being exposed in the tank lead to overheating? I can understand the weak PSI, but why does it go to 90?

Again, already replaced the FPS and FPDM.

Help!?!

[JBeezy]

I'd go in the tank and inspect hoses. Replace pump while you're in there. They aren't expensive

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[Zack]

Put a new pump in with submersible fuel line

[robertmee]

What's the best pump plug-n-play for Trilogy, forged bottom end, 475rwhp? GT40? I don't want to go the dual pump route if not necessary, and before this started happening, the current Walbro with KB BAP did fine.

[Zack]

Put another GSS342 in it

[robertmee]

Put another GSS342 in it

Thanks Zack!

Is the install kit with pigtail worth it or needed? I don't suppose there is a specific one that we can use, or just splice it in with butt connectors?

[Zack]

Although unlikely, the FPDM may be going into thermal shutdown.
To rule this out, I would take the cover off and point a 12v fan at it. If the problems go away, you need a modified FPDM

[robertmee]

Well I've used two different fpdms with the same result....granted they were not modified but the 2nd one I left exposed. And the car ran fine for 3 years prior to the first incident last summer. The problem is that it's so intermittent...it's happened maybe 3 times this summer and twice last summer. Never in the winter. I guess the trunk could be getting hot enough but for two different ones to act the same...odd. FBM has offered to loan me a modified one. I guess I can try it but with the weather cooling it will be hard to know if it solved anything.

[justbob]

I couldn't tell you if mine got solved by going return fuel or having dramatically reduced my under hood temps from an over spun Trilogy to a Procharger.

But with the FPDM offline now I obviously haven't had a single issue.

For me I really want to say it was my IATS. They were beyond ridiculous to the point I was actually melting and warping a couple of under hood items..


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[robertmee]

I couldn't tell you if mine got solved by going return fuel or having dramatically reduced my under hood temps from an over spun Trilogy to a Procharger.

But with the FPDM offline now I obviously haven't had a single issue.

For me I really want to say it was my IATS. They were beyond ridiculous to the point I was actually melting and warping a couple of under hood items..


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Interesting....So I started monitoring my IAT's along with my FPSI. In stop/go traffic yesterday with 90 deg temps, the IAT's sat around 145 deg F. That drove the FPSI to 60 PSI, assuming I guess from my tune. I remember in an earlier post by Zack that some tuners adjust FPSI to IAT and some lock it at 40 PSI...Evidently mine is adjusting.

Once I got the car to freeway speed, the IAT's quickly dropped to around 98 deg's, and the FPSI declined to around 48 to 50PSI. Could it be that my tune is just putting too much stress on my Fuel Pump to run higher PSI at higher temps and eventually overheats? Is there anything I should be looking at in the intercooler system or is 145 Deg F normal. I googled a few past posts on the subject and it was inconclusive as to what 'normal' IAT's would be on a trilogy setup.