Auxiliary fuel system Does yours leak ?

asthmamax11 · 09-22-2022, 10:51 AM

Hello
Good morning

Who has had experience with the Auxilliary fuel system leaking ?

I hear it is fairly common

What was the remedy you implemented ?

cjperformance · 09-22-2022, 11:30 AM

Are you referring to the DSX kit? I had a hell of a time when I first installed it leaking at the tank fitting. Just "working with it" and trying different combinations of tightness of the fitting helped... If mine ever shows any signs of leaking again, I'll either:
A) Go with an intank solution (expensive)
or
B) Try to use some kind of bulkhead type fitting that they normally use on fuel cells (cheaper), but not sure if the curved area of the tank where it's add will work.
or
C) Others have suggested going with the next size up fitting for the tank.

Honestly in hindsight tapping the tank was a stupid idea. I had expected more meat to thread things into.

asthmamax11 · 09-22-2022, 11:38 AM

Quote:

Originally Posted by cjperformance

Are you referring to the DSX kit? I had a hell of a time when I first installed it leaking at the tank fitting. Just "working with it" and trying different combinations of tightness of the fitting helped... If mine ever shows any signs of leaking again, I'll either:
A) Go with an intank solution (expensive)
or
B) Try to use some kind of bulkhead type fitting that they normally use on fuel cells (cheaper), but not sure if the curved area of the tank where it's add will work.
or
C) Others have suggested going with the next size up fitting for the tank.

Honestly in hindsight tapping the tank was a stupid idea. I had expected more meat to thread things into.

Thank you this is exactly the type of information I was looking for.

I just installed a few mods and got a bump in power.
Still on stock LT1 fueling
40k miles
Almost 20k boosted on Heartbeat kit pulley (single digit PSI)

I think it's time to be satisfied with my power levels and just enjoy the car.

In a few years I'll consider upgrading to a ZL1 or C7

Boost is most expensive when you get greedy

JSH · 09-22-2022, 03:54 PM

Someone here or on another thread today mentioned the danger associated with running less than 1/4 tank of fuel with DSX's low side fuel pump and Gen6's saddle style fuel tanks. I asked DSX about this and they said I shouldn't have a pressure problem unless the "low fuel light is on." Anyone know at what level the fuel light comes on?

Puddin · 09-22-2022, 04:14 PM

Quote:

Originally Posted by asthmamax11

Thank you this is exactly the type of information I was looking for.

I just installed a few mods and got a bump in power.
Still on stock LT1 fueling
40k miles
Almost 20k boosted on Heartbeat kit pulley (single digit PSI)

I think it's time to be satisfied with my power levels and just enjoy the car.

In a few years I'll consider upgrading to a ZL1 or C7

Boost is most expensive when you get greedy

I've had mine for almost 3yrs now and not a single leak.

MartinLe · 09-22-2022, 04:31 PM

Quote:

Originally Posted by JSH

Someone here or on another thread today mentioned the danger associated with running less than 1/4 tank of fuel with DSX's low side fuel pump and Gen6's saddle style fuel tanks. I asked DSX about this and they said I shouldn't have a pressure problem unless the "low fuel light is on." Anyone know at what level the fuel light comes on?

My fuel light pops on at 9% - roughly 2 gallons.

The biggest problem I see with tapping the tank is running the tap in too far. I used a 9/16 drill bit - a little smaller than recommended. I ran the tap in a little ways and checked it. Kept doing that until I got the right depth. Oh yeah, DO NOT USE A WRENCH ON THE FITTING!!

JSH · 09-22-2022, 05:53 PM

Quote:

Originally Posted by MartinLe

My fuel light pops on at 9% - roughly 2 gallons.

The biggest problem I see with tapping the tank is running the tap in too far. I used a 9/16 drill bit - a little smaller than recommended. I ran the tap in a little ways and checked it. Kept doing that until I got the right depth. Oh yeah, DO NOT USE A WRENCH ON THE FITTING!!

It sounds like a 1/4 tank is a good place to be at the strip.

We installed the DSX a year ago. When the car was on the lift a few weeks ago, we noticed the tap had been leaking, so we cleaned the outside and added some additional sealant. It's a real touchy little connection.

asthmamax11 · 09-22-2022, 05:59 PM

Quote:

Originally Posted by Puddin

I've had mine for almost 3yrs now and not a single leak.

3 years
How many miles though ?

MartinLe · 09-22-2022, 06:15 PM

Quote:

Originally Posted by JSH

It sounds like a 1/4 tank is a good place to be at the strip.

We installed the DSX a year ago. When the car was on the lift a few weeks ago, we noticed the tap had been leaking, so we cleaned the outside and added some additional sealant. It's a real touchy little connection.

I gave some thought to the possibility of it leaking. I figure that as long as the tap job is not too hacked up, there must be sealants out there that will stop the leak. Worst case scenario, the hole gets plugged with some sort of plastic welding material and the new hole gets tapped correctly.

Mine is solidly in place and I don't see why or how it would start leaking.

KingLT1 · 09-22-2022, 09:03 PM

Cordes performance aux setup I believe uses a bulk head fitting for that reason.

Puddin · 09-22-2022, 11:27 PM

Quote:

Originally Posted by asthmamax11

3 years
How many miles though ?

Was put on at a little past 10k and I'm now above 31 so 20k miles give or take.

SOCAL.M6.ZLE · 09-22-2022, 11:34 PM

Quote:

Originally Posted by MartinLe

I gave some thought to the possibility of it leaking. I figure that as long as the tap job is not too hacked up, there must be sealants out there that will stop the leak. Worst case scenario, the hole gets plugged with some sort of plastic welding material and the new hole gets tapped correctly.

Mine is solidly in place and I don't see why or how it would start leaking.

I have the same concerns... Makes me worried that a small fender bender could knock it loose? This may push me to do an in-tank pump for this reason.

Joshinator99 · 09-23-2022, 02:07 AM

Quote:

Originally Posted by SOCAL.M6.ZLE

I have the same concerns... Makes me worried that a small fender bender could knock it loose? This may push me to do an in-tank pump for this reason.

Agreed and did in-tank for this reason. Having a tapping in a tank that is too thin to be tapped properly AND below the fuel level is more than I was comfortable with.

JSH · 09-23-2022, 08:11 AM

Quote:

Originally Posted by KingLT1

Cordes performance aux setup I believe uses a bulk head fitting for that reason.

I just contacted them about it, and, yes, they do sell one, thx

09-22-2022, 10:51 AM	#1
asthmamax11 Drives: 1SS Summit White 6 speed Join Date: Jul 2017 Location: Gainesville GA Posts: 579	Auxiliary fuel system Does yours leak ? Hello Good morning Who has had experience with the Auxilliary fuel system leaking ? I hear it is fairly common What was the remedy you implemented ? __________________ 16 1SS M6 White Magnuson 2.3 Heartbeat Roto Fab Solo Performance Cat deletes and Axleback Hurst short shifter #'s coming soon Riaction coilovers 1LE sway bars BMR mm BMR chassis brace Flow one 19" wheels wrapped in Mickey Thompsons 02 Z28 M6 35th anniversary 80k miles T-tops Leather Bolt ons Joy to drive this classic every day! Daily Driver

09-22-2022, 11:30 AM	#2
cjperformance Drives: 2017 Camaro SS 50th Anniversary Join Date: Apr 2021 Location: Missouri Posts: 929	Are you referring to the DSX kit? I had a hell of a time when I first installed it leaking at the tank fitting. Just "working with it" and trying different combinations of tightness of the fitting helped... If mine ever shows any signs of leaking again, I'll either: A) Go with an intank solution (expensive) or B) Try to use some kind of bulkhead type fitting that they normally use on fuel cells (cheaper), but not sure if the curved area of the tank where it's add will work. or C) Others have suggested going with the next size up fitting for the tank. Honestly in hindsight tapping the tank was a stupid idea. I had expected more meat to thread things into. __________________ 2017 50th Anniversary Edition \| P1X Stage 2 DSX Aux Low Side \| LT4 high side \| Flex Fuel TooHighPsi Port Injection (installed & tuning) CircleD 3K Stall \| QA1 CF Driveshaft Forgestar F14 Drag 17x10 NT555R2 305/45/17 Rear Forgestar F14 18x8 NT555G2 235/50/18 Front 10.84@131 w/4.13" pulley ??.??@??? w/3.7" pulley (installed & tuning)

09-22-2022, 03:54 PM	#4
JSH Drives: '20 ZLE Join Date: Jun 2020 Location: Mile High Posts: 3,558	Someone here or on another thread today mentioned the danger associated with running less than 1/4 tank of fuel with DSX's low side fuel pump and Gen6's saddle style fuel tanks. I asked DSX about this and they said I shouldn't have a pressure problem unless the "low fuel light is on." Anyone know at what level the fuel light comes on? __________________ '20 ZL1 1LE A10, OEM short block, LME heads/valve train, E2650. 100+ octanes, no eth, no meth, no N2O. 2/23 - 1031/1004 wheel. 4/23 - 1.41/9.61/145 at DA 7000 ft. (only made five passes). 2/24 - LME 390, E2650, FBO, 100 oct.; 1116hp/ 1063tq; 109 oct. dyno next.

09-22-2022, 09:03 PM	#10
KingLT1 Drives: 2016 1SS NFG A8 Join Date: Aug 2017 Location: 46804 Posts: 6,796	Cordes performance aux setup I believe uses a bulk head fitting for that reason. __________________ 2016 NFG 1SS A8 Options-2SS Leather/NPP Perf. mods-Whipple 2.9/Fuel System/Flex Fuel/103mm TB/Rotofab Big Gulp/Cat Deletes/Corsa NPP Per. times- 10.5 @ 137 w/ 1.8 60ft Full weight on 20's 1200DA

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