Fuel Pressure loss on hard left turns

Jason18ZL1LE · 11-19-2018, 10:41 PM

I did a post yesterday but since then we have discovered a few more details via testing. So at the track I was getting an engine light, loss of power and backfire on hard left hand turns. The two codes thrown are P0628 and P12A6. Both reference Low Fuel Pump A voltage.

Today while testing and logging with HPTuners, we noticed that fuel pressure will drop all the way to 7psi when making these hard left turns. The car is modified with DSX, Cam, E85, Intake, 10% Pully, LTHs etc.

We are suspecting that something could be funky with the FPCM but we are purely guessing at this time. We’ve checked all connectors on the fuel system from front to rear, checked for shorts and pinched wires as well as grounds etc.

Can anyone think of anything that we may be missing as to what would cause this left turn behavior? Right turns exhibit a slightly similar behavior but psi only drops to approximately 45psi. The tune is desiring 81psi so it should always be much higher. Straight line pulls are a solid 70+ psi

GrabTheWheel · 11-19-2018, 10:45 PM

Is this with a full tank? If you're serious about the track it sounds like it might be time for a surge tank?

Jason18ZL1LE · 11-19-2018, 10:47 PM

Yes this is with a full tank. I’ve also tracked this car when it was stock many times down to a 1/4 tank with no starvation issues. This isn’t fuel starve, at least not in the traditional sense, something is causing the pump to lose voltage and as such, pressure

GrabTheWheel · 11-19-2018, 10:50 PM

Also you are the man for throwing your warranty out the window and tracking hard. Huge balls you have sir!

Jason18ZL1LE · 11-19-2018, 10:52 PM

Gotta pay to play

11-19-2018, 10:41 PM	#1
Jason18ZL1LE Drives: 2018 ZL1 1LE Join Date: Apr 2018 Location: SoCal Posts: 134	Fuel Pressure loss on hard left turns I did a post yesterday but since then we have discovered a few more details via testing. So at the track I was getting an engine light, loss of power and backfire on hard left hand turns. The two codes thrown are P0628 and P12A6. Both reference Low Fuel Pump A voltage. Today while testing and logging with HPTuners, we noticed that fuel pressure will drop all the way to 7psi when making these hard left turns. The car is modified with DSX, Cam, E85, Intake, 10% Pully, LTHs etc. We are suspecting that something could be funky with the FPCM but we are purely guessing at this time. We’ve checked all connectors on the fuel system from front to rear, checked for shorts and pinched wires as well as grounds etc. Can anyone think of anything that we may be missing as to what would cause this left turn behavior? Right turns exhibit a slightly similar behavior but psi only drops to approximately 45psi. The tune is desiring 81psi so it should always be much higher. Straight line pulls are a solid 70+ psi

11-19-2018, 10:45 PM	#2
GrabTheWheel Drives: 18' ZL1 A10 Join Date: Feb 2018 Location: California Posts: 98	Is this with a full tank? If you're serious about the track it sounds like it might be time for a surge tank?

11-19-2018, 10:47 PM	#3
Jason18ZL1LE Drives: 2018 ZL1 1LE Join Date: Apr 2018 Location: SoCal Posts: 134	Yes this is with a full tank. I’ve also tracked this car when it was stock many times down to a 1/4 tank with no starvation issues. This isn’t fuel starve, at least not in the traditional sense, something is causing the pump to lose voltage and as such, pressure

11-19-2018, 10:50 PM	#4
GrabTheWheel Drives: 18' ZL1 A10 Join Date: Feb 2018 Location: California Posts: 98	Also you are the man for throwing your warranty out the window and tracking hard. Huge balls you have sir!

11-19-2018, 10:52 PM	#5
Jason18ZL1LE Drives: 2018 ZL1 1LE Join Date: Apr 2018 Location: SoCal Posts: 134	Gotta pay to play

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