Fuel Pump or Tuner Issues - Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums

ZL1_David · 07-20-2020, 01:43 PM

I have a 2013 ZL1, got the aux pump and flex fuel sensor kit from SMG. Installed the pump and flex fuel sensor no issues. Took it to my tuner that got the license to tune the fscm but every single time we hit ~4800-5k rpms the computer cuts fuel causing my AFR to lean out. It'll go from 65psi straight down to 35psi on the pump. My tuner says its the pump, when i contacted SMG they said its the tuner. The reason SMG says its the tuner is because its consistent at the rpms and the graph shows an immediate fuel cut off, not a slow pump fail of it not being able to keep up. So im stuck between a rock and a hard place, either its the pump or the tuner. I hate to say tuner because I have a long standing relationship of him tuning my last 4 cars with ZERO issues. Any help, suggestions, or guidance would be appreciated.

I know some people have mixed feelings about SMG, this is my first possible issue with them IF it is the pump.

RobZL1 · 07-20-2020, 04:08 PM

Has your tuner ever tuned an aux pump in a 5th gen? Things in the tune need to be adjusted to prevent the fscm from trying to drop pressure once the aux kicks in, and also allow the higher pressure you desire. Need to look at the max desired pressure, the flow vs pressure tables, and the min duty cycle at a minimum.

Crash76 · 07-20-2020, 08:50 PM

When DSX did my tune he also made chances to the FPCM

Full_Spectrum · 07-21-2020, 08:30 AM

It is absolutely the tuner.

Juiced1 · 07-22-2020, 08:07 AM

Yeah it's in the tune. These 5gen fpcm set ups are a pain and don't make a ton of sense until you've done a couple. These aux pumps don't exactly work with the fpcm very well until they are tuned for it. Have your tuner contact SMG and they'll get it figured out.

ZL1_David · 07-22-2020, 04:26 PM

Quote:

Originally Posted by Juiced1

Yeah it's in the tune. These 5gen fpcm set ups are a pain and don't make a ton of sense until you've done a couple. These aux pumps don't exactly work with the fpcm very well until they are tuned for it. Have your tuner contact SMG and they'll get it figured out.

have contacted them, they offered no tuning support

Juiced1 · 07-24-2020, 11:08 PM

Seems to be a common theme with these aux pump guys. Tell your tuner he needs to tune the fpcm to make it work.

d454brisson · 07-26-2020, 12:34 PM

do you have the hpt files? Can compare to mine with a dsx, i see drop through the range but its just usage not a cut.

07-20-2020, 01:43 PM	#1
ZL1_David Drives: 2013 ZL1 Camaro Join Date: Jul 2018 Location: Louisville KY Posts: 6	Fuel Pump or Tuner Issues I have a 2013 ZL1, got the aux pump and flex fuel sensor kit from SMG. Installed the pump and flex fuel sensor no issues. Took it to my tuner that got the license to tune the fscm but every single time we hit ~4800-5k rpms the computer cuts fuel causing my AFR to lean out. It'll go from 65psi straight down to 35psi on the pump. My tuner says its the pump, when i contacted SMG they said its the tuner. The reason SMG says its the tuner is because its consistent at the rpms and the graph shows an immediate fuel cut off, not a slow pump fail of it not being able to keep up. So im stuck between a rock and a hard place, either its the pump or the tuner. I hate to say tuner because I have a long standing relationship of him tuning my last 4 cars with ZERO issues. Any help, suggestions, or guidance would be appreciated. I know some people have mixed feelings about SMG, this is my first possible issue with them IF it is the pump.

07-20-2020, 04:08 PM	#2
RobZL1 fo'shizZL1 Drives: 2017 ZL1 Join Date: Aug 2017 Location: ATL Posts: 1,281	Has your tuner ever tuned an aux pump in a 5th gen? Things in the tune need to be adjusted to prevent the fscm from trying to drop pressure once the aux kicks in, and also allow the higher pressure you desire. Need to look at the max desired pressure, the flow vs pressure tables, and the min duty cycle at a minimum. __________________ 2017 ZL1 M6 Black \| Maggie 2650 // 103TB // Big Gulp Past Rides- 2014 ZL1 M6 Red Hot \| Tons of mods 2004 CTS-V M6 Silver \| Many mods 1995 Corvette M6 Torch Red \| A few more mods 1992 Camaro M5 White \| A few mods

07-20-2020, 08:50 PM	#3
Crash76 Team 913 Drives: '14 ZL1, '15 Jeep GC, ‘22 Ram 2500 Join Date: Apr 2015 Location: USA, Central CA Posts: 1,119	When DSX did my tune he also made chances to the FPCM

07-21-2020, 08:30 AM	#4
Full_Spectrum Drives: 2013 ZL1 Join Date: Jan 2020 Location: Virginia Posts: 55	It is absolutely the tuner.

07-22-2020, 08:07 AM	#5
Juiced1 Account Suspended Drives: 2012 2SS CAMARO 45th Join Date: Apr 2011 Location: St. Charles, IL Posts: 18,663	Yeah it's in the tune. These 5gen fpcm set ups are a pain and don't make a ton of sense until you've done a couple. These aux pumps don't exactly work with the fpcm very well until they are tuned for it. Have your tuner contact SMG and they'll get it figured out.

07-24-2020, 11:08 PM	#7
Juiced1 Account Suspended Drives: 2012 2SS CAMARO 45th Join Date: Apr 2011 Location: St. Charles, IL Posts: 18,663	Seems to be a common theme with these aux pump guys. Tell your tuner he needs to tune the fpcm to make it work.

07-26-2020, 12:34 PM	#8
d454brisson Drives: 2014 ZL1 Join Date: Jul 2016 Location: Baltimore MD Posts: 345	do you have the hpt files? Can compare to mine with a dsx, i see drop through the range but its just usage not a cut.