2012 Sierra RCSB 5.3 build thread @ New Era Performance
Mar 28, 2013 | 04:56 AM
#281
heres some info I found on the HP tuners website maybe this will help...
FPCM is making my life miserable.
Hey guys, here's another thread that concerns weird things that a GMT900 series pickup does. After the addition of my new fuel system I have been battling my FPCM, and the boost referenced regulator.
I'm running a twin Walbro 255 in tank fuel pump setup, one fuel pump being powered off the trucks fuel pump circuit, the other connected to a Kenne Bell BAP, which is triggered off of a Hobbs switch set to 3 psi boost.
Problem is, the regulator is set to 58psi then boost referenced off the manifold.
The FPCM however only knows low flow, normal, and high flow conditions. So I set normal and low flow to 53psi as that's where it idles at with vacuum on the manifold, and 72psi for high flow as that's 14psi boost.
Problem is, at mid boost levels the FPCM is commanding 72psi fuel pressure but delivered fuel pressure due to the regulator is only 66psi or so as it will only be boosting 8 psi which trips a CEL of the fuel rail pressure sensor going haywire.
How in the hell do you get around this problem? Is there a way to just disable the FPCM and let the primary pump run at 12 volts all the time without the CEL being tripped? I can't disable it in the tune
Response
test car
2010 Silverado 2-wheel drive 5.3
LSX376 w/ cogged 2300 Maggy
walbro 400 pump
AN send return fuel lines w/ rising rate adj return reg
process to delete FPCM with return fuel system
Unpluged the FPCM
*under the bed of the trucks above the spare
*passenger side rear seat under the quarter window on the 5thgen camaro
Large Pins 47 & 16 with around 10 gauge wire supply ground and power to the pump
ground is Pink ...WTF~!
Depin the connector and repin for new weather pack relay
Pin 13 Dark Green / white stripe is the trigger form the PCM key hot.
in HPT turn off P0230 and U0109
go make power!
Im guessing this worked for him as he says no issues after doing the repin relay mod as they call it. This was also posted so maybe there is a few ways around this...
I simply cut the gray wire and ran another one to the misc ignition source in the fusebox with an additional circuit carrier and 30 AMP fuse. Pulled the FPCM fuse and it seems to be working well for now. No hot circuits or anything, no starting problems, and it's 58psi at key on. I turned the fuel pressure all the way up to 90 psi and held it for 2 minutes on a single pump with no issues. Will continue to test.
FPCM is making my life miserable.
Hey guys, here's another thread that concerns weird things that a GMT900 series pickup does. After the addition of my new fuel system I have been battling my FPCM, and the boost referenced regulator.
I'm running a twin Walbro 255 in tank fuel pump setup, one fuel pump being powered off the trucks fuel pump circuit, the other connected to a Kenne Bell BAP, which is triggered off of a Hobbs switch set to 3 psi boost.
Problem is, the regulator is set to 58psi then boost referenced off the manifold.
The FPCM however only knows low flow, normal, and high flow conditions. So I set normal and low flow to 53psi as that's where it idles at with vacuum on the manifold, and 72psi for high flow as that's 14psi boost.
Problem is, at mid boost levels the FPCM is commanding 72psi fuel pressure but delivered fuel pressure due to the regulator is only 66psi or so as it will only be boosting 8 psi which trips a CEL of the fuel rail pressure sensor going haywire.
How in the hell do you get around this problem? Is there a way to just disable the FPCM and let the primary pump run at 12 volts all the time without the CEL being tripped? I can't disable it in the tune
Response
test car
2010 Silverado 2-wheel drive 5.3
LSX376 w/ cogged 2300 Maggy
walbro 400 pump
AN send return fuel lines w/ rising rate adj return reg
process to delete FPCM with return fuel system
Unpluged the FPCM
*under the bed of the trucks above the spare
*passenger side rear seat under the quarter window on the 5thgen camaro
Large Pins 47 & 16 with around 10 gauge wire supply ground and power to the pump
ground is Pink ...WTF~!
Depin the connector and repin for new weather pack relay
Pin 13 Dark Green / white stripe is the trigger form the PCM key hot.
in HPT turn off P0230 and U0109
go make power!
Im guessing this worked for him as he says no issues after doing the repin relay mod as they call it. This was also posted so maybe there is a few ways around this...
I simply cut the gray wire and ran another one to the misc ignition source in the fusebox with an additional circuit carrier and 30 AMP fuse. Pulled the FPCM fuse and it seems to be working well for now. No hot circuits or anything, no starting problems, and it's 58psi at key on. I turned the fuel pressure all the way up to 90 psi and held it for 2 minutes on a single pump with no issues. Will continue to test.
Last edited by Three6GMC; Mar 28, 2013 at 05:07 AM.
Mar 28, 2013 | 12:53 PM
#282
heres some info I found on the HP tuners website maybe this will help...
FPCM is making my life miserable.
Hey guys, here's another thread that concerns weird things that a GMT900 series pickup does. After the addition of my new fuel system I have been battling my FPCM, and the boost referenced regulator.
I'm running a twin Walbro 255 in tank fuel pump setup, one fuel pump being powered off the trucks fuel pump circuit, the other connected to a Kenne Bell BAP, which is triggered off of a Hobbs switch set to 3 psi boost.
Problem is, the regulator is set to 58psi then boost referenced off the manifold.
The FPCM however only knows low flow, normal, and high flow conditions. So I set normal and low flow to 53psi as that's where it idles at with vacuum on the manifold, and 72psi for high flow as that's 14psi boost.
Problem is, at mid boost levels the FPCM is commanding 72psi fuel pressure but delivered fuel pressure due to the regulator is only 66psi or so as it will only be boosting 8 psi which trips a CEL of the fuel rail pressure sensor going haywire.
How in the hell do you get around this problem? Is there a way to just disable the FPCM and let the primary pump run at 12 volts all the time without the CEL being tripped? I can't disable it in the tune
Response
test car
2010 Silverado 2-wheel drive 5.3
LSX376 w/ cogged 2300 Maggy
walbro 400 pump
AN send return fuel lines w/ rising rate adj return reg
process to delete FPCM with return fuel system
Unpluged the FPCM
*under the bed of the trucks above the spare
*passenger side rear seat under the quarter window on the 5thgen camaro
Large Pins 47 & 16 with around 10 gauge wire supply ground and power to the pump
ground is Pink ...WTF~!
Depin the connector and repin for new weather pack relay
Pin 13 Dark Green / white stripe is the trigger form the PCM key hot.
in HPT turn off P0230 and U0109
go make power!
Im guessing this worked for him as he says no issues after doing the repin relay mod as they call it. This was also posted so maybe there is a few ways around this...
I simply cut the gray wire and ran another one to the misc ignition source in the fusebox with an additional circuit carrier and 30 AMP fuse. Pulled the FPCM fuse and it seems to be working well for now. No hot circuits or anything, no starting problems, and it's 58psi at key on. I turned the fuel pressure all the way up to 90 psi and held it for 2 minutes on a single pump with no issues. Will continue to test.
FPCM is making my life miserable.
Hey guys, here's another thread that concerns weird things that a GMT900 series pickup does. After the addition of my new fuel system I have been battling my FPCM, and the boost referenced regulator.
I'm running a twin Walbro 255 in tank fuel pump setup, one fuel pump being powered off the trucks fuel pump circuit, the other connected to a Kenne Bell BAP, which is triggered off of a Hobbs switch set to 3 psi boost.
Problem is, the regulator is set to 58psi then boost referenced off the manifold.
The FPCM however only knows low flow, normal, and high flow conditions. So I set normal and low flow to 53psi as that's where it idles at with vacuum on the manifold, and 72psi for high flow as that's 14psi boost.
Problem is, at mid boost levels the FPCM is commanding 72psi fuel pressure but delivered fuel pressure due to the regulator is only 66psi or so as it will only be boosting 8 psi which trips a CEL of the fuel rail pressure sensor going haywire.
How in the hell do you get around this problem? Is there a way to just disable the FPCM and let the primary pump run at 12 volts all the time without the CEL being tripped? I can't disable it in the tune
Response
test car
2010 Silverado 2-wheel drive 5.3
LSX376 w/ cogged 2300 Maggy
walbro 400 pump
AN send return fuel lines w/ rising rate adj return reg
process to delete FPCM with return fuel system
Unpluged the FPCM
*under the bed of the trucks above the spare
*passenger side rear seat under the quarter window on the 5thgen camaro
Large Pins 47 & 16 with around 10 gauge wire supply ground and power to the pump
ground is Pink ...WTF~!
Depin the connector and repin for new weather pack relay
Pin 13 Dark Green / white stripe is the trigger form the PCM key hot.
in HPT turn off P0230 and U0109
go make power!
Im guessing this worked for him as he says no issues after doing the repin relay mod as they call it. This was also posted so maybe there is a few ways around this...
I simply cut the gray wire and ran another one to the misc ignition source in the fusebox with an additional circuit carrier and 30 AMP fuse. Pulled the FPCM fuse and it seems to be working well for now. No hot circuits or anything, no starting problems, and it's 58psi at key on. I turned the fuel pressure all the way up to 90 psi and held it for 2 minutes on a single pump with no issues. Will continue to test.
Apr 19, 2013 | 11:37 AM
#284
I have just been driving the truck daily with no problems as of yet. The only thing I changed since is I upgraded to a triple gauge pod instead of the dual so that I could have an Aeroforce gauge as well to keep an eye on transmission temperature and Intake air temperature. I am probably not going to make any more changes until after I make a trip to the track to see what it does.
Apr 22, 2013 | 02:18 PM
#286
I don't have the stock y-pipe, it is the American Racing Headers off road y-pipe (No cats). I would guess a true dual free flowing exhaust would probably yield another 15 hp.
Apr 22, 2013 | 07:42 PM
#287
Apr 27, 2013 | 10:35 AM
#288
Teching In
Joined: Apr 2013
Posts: 33
Likes: 0
New to the site. Just read the whole thread. Great work! I have a 2010 Suburban 5.3 2wd running the 2.3 Whipple @7psi and I love it. Transmission tune sucks though. I'm ready to do some more stuff. Shot you an email on the website.
Apr 27, 2013 | 02:58 PM
#289
Thanks! We will get back to you on Monday in regards to your email.
Apr 27, 2013 | 03:15 PM
#290
What's faster from a 40-120mph roll race, the New Era Camaro SS or the New Era GMC Sierra? We were curious today, so we decided to test it out, I think you will be surprised at the result. Click the link to watch the video:
http://youtu.be/-rS3rTSIxf4
http://youtu.be/-rS3rTSIxf4