low side fuel pressure loss

chevroletman · 10-24-2025, 08:16 PM

To start off I have a 2019 ZL1 1LE- mostly track car- Last weekend went to Road America for the first time. the first couple sessions the track was wet, so obviously not going fast. On the third session just starting to pick up some speed and learn the track and experienced low side fuel pressure loss coming out of the carousel, after a second It picked back up and was fine down the long straights. Tank was 1/2 full. Came in and topped off fuel thinking maybe all the fuel sloshed over to the left. I run about 50% E85, next time out the same thing with the tank full- fine on straights but pressure drop coming out of the carousel. I had this same problem about 2 years ago and replaced fuel driver, jet pump and installed OG fuel solutions 400lph in tank pump. Car has been running flawlessly for the last couple years until now. The car has less than 9000 miles on it, and why would it maintain low side pressure on straights when I'm full throttle for seems like forever and lose pressure while maintaining speed with much lower demand only on right hand turns with a full tank of fuel? Has anyone had this issue on right handers on track?

chevroletman · 10-30-2025, 08:03 PM

Nobody has had this issue? surely I'm not the only one- any comments are appreciated!

Rapid_blue_zl1_22 · 11-01-2025, 06:04 AM

I never had an issue with my ZL1 on track. My local track has a carousel also that I take around 80 MPH (both direction CW/CCW) My car made 731 whp on E30 blend. I was running a Katech duel pump setup in tank. My experience was the opposite, I could run my car down to the fuel light came on and still never had fuel starve issues. I switched to an SS 1LE now, and run faster times than I did in my ZL1.

Heat soak was my only issue with the ZL1.

SOCAL.M6.ZLE · 11-01-2025, 11:29 AM

Quote:

Originally Posted by chevroletman

To start off I have a 2019 ZL1 1LE- mostly track car- Last weekend went to Road America for the first time. the first couple sessions the track was wet, so obviously not going fast. On the third session just starting to pick up some speed and learn the track and experienced low side fuel pressure loss coming out of the carousel, after a second It picked back up and was fine down the long straights. Tank was 1/2 full. Came in and topped off fuel thinking maybe all the fuel sloshed over to the left. I run about 50% E85, next time out the same thing with the tank full- fine on straights but pressure drop coming out of the carousel. I had this same problem about 2 years ago and replaced fuel driver, jet pump and installed OG fuel solutions 400lph in tank pump. Car has been running flawlessly for the last couple years until now. The car has less than 9000 miles on it, and why would it maintain low side pressure on straights when I'm full throttle for seems like forever and lose pressure while maintaining speed with much lower demand only on right hand turns with a full tank of fuel? Has anyone had this issue on right handers on track?

Hey buddy, is that in tank pump bucketed? Can you share a link?

Msquared · 11-03-2025, 07:14 AM

FWIW (just another data point), I have much the same experience as Rapid_blue: my SS 1LE has always has consistent fuel flow down to the warning light. I literally just got back from a weekend at NCM in Bowling Green, and it has two long, sustained high-speed right-handers (Turns 5 and 15) plus the sinkhole turn 18/19 (slower ~220-degree turn with a steep dropoff), and as usual there were no issues. I think something is wrong with your car. I don't know what these gas tanks look like inside, but I wonder if there's a missing or broken baffle in yours.

bishopts · 11-03-2025, 09:19 AM

The low pressure pump pulls from a roughly 1 quart cup at the bottom of the fuel pump assembly. Its gravity fed from its bottom and open on the top to alow fuel to spill over into it. The design is to eliminate the need for tank baffling.

chevroletman · 11-05-2025, 07:23 PM

this is a link to what I am running- it's capable of 400lph
ad you can see it is similar to stock LT4 pump and uses the factory jet pump
I also must say I have had no issues for about 2 years- and only on right handers- after a second or 2 on the straights it maintains pressure all the
way to the next turn-

https://www.ogfuelsolutions.com/prod...ge/frankenpump

10-24-2025, 08:16 PM	#1
chevroletman Drives: 2021 ZL1 1LE A10 Join Date: May 2020 Location: midwest Posts: 33	low side fuel pressure loss To start off I have a 2019 ZL1 1LE- mostly track car- Last weekend went to Road America for the first time. the first couple sessions the track was wet, so obviously not going fast. On the third session just starting to pick up some speed and learn the track and experienced low side fuel pressure loss coming out of the carousel, after a second It picked back up and was fine down the long straights. Tank was 1/2 full. Came in and topped off fuel thinking maybe all the fuel sloshed over to the left. I run about 50% E85, next time out the same thing with the tank full- fine on straights but pressure drop coming out of the carousel. I had this same problem about 2 years ago and replaced fuel driver, jet pump and installed OG fuel solutions 400lph in tank pump. Car has been running flawlessly for the last couple years until now. The car has less than 9000 miles on it, and why would it maintain low side pressure on straights when I'm full throttle for seems like forever and lose pressure while maintaining speed with much lower demand only on right hand turns with a full tank of fuel? Has anyone had this issue on right handers on track?

11-01-2025, 06:04 AM	#3
Rapid_blue_zl1_22 See you at the Track! Drives: 2022 Rapid Blue SS 1LE Join Date: Feb 2022 Location: Fulshear, TX Posts: 294	I never had an issue with my ZL1 on track. My local track has a carousel also that I take around 80 MPH (both direction CW/CCW) My car made 731 whp on E30 blend. I was running a Katech duel pump setup in tank. My experience was the opposite, I could run my car down to the fuel light came on and still never had fuel starve issues. I switched to an SS 1LE now, and run faster times than I did in my ZL1. Heat soak was my only issue with the ZL1. __________________ 2022 M6 Rapid Blue 1SS 1LE PDR (Current) 2022 M6 Rapid Blue ZL1 (SOLD)

11-03-2025, 07:14 AM	#5
Msquared Drives: Chevrolet SS 1LE Join Date: Oct 2019 Location: St. Charles, MO Posts: 1,722	FWIW (just another data point), I have much the same experience as Rapid_blue: my SS 1LE has always has consistent fuel flow down to the warning light. I literally just got back from a weekend at NCM in Bowling Green, and it has two long, sustained high-speed right-handers (Turns 5 and 15) plus the sinkhole turn 18/19 (slower ~220-degree turn with a steep dropoff), and as usual there were no issues. I think something is wrong with your car. I don't know what these gas tanks look like inside, but I wonder if there's a missing or broken baffle in yours. __________________ Matt Miller 2020 SS 1LE

10-30-2025, 08:03 PM	#2
chevroletman Drives: 2021 ZL1 1LE A10 Join Date: May 2020 Location: midwest Posts: 33	Nobody has had this issue? surely I'm not the only one- any comments are appreciated!

11-03-2025, 09:19 AM	#6
bishopts Drives: 2017 2ss 6mt Join Date: Mar 2024 Location: dallas Posts: 1,607	The low pressure pump pulls from a roughly 1 quart cup at the bottom of the fuel pump assembly. Its gravity fed from its bottom and open on the top to alow fuel to spill over into it. The design is to eliminate the need for tank baffling.

11-05-2025, 07:23 PM	#7
chevroletman Drives: 2021 ZL1 1LE A10 Join Date: May 2020 Location: midwest Posts: 33	this is a link to what I am running- it's capable of 400lph ad you can see it is similar to stock LT4 pump and uses the factory jet pump I also must say I have had no issues for about 2 years- and only on right handers- after a second or 2 on the straights it maintains pressure all the way to the next turn- https://www.ogfuelsolutions.com/prod...ge/frankenpump

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