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2010 CTS-V
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Discussion Starter · #1 · (Edited)
Hey Everyone, I installed a couple fuel upgrades to my V and I'm wondering if I have an issue with hardware or is there something in the tune that needs attention. Below I will list what I recently added and the issues I'm having.

Recently Installed:
-Dual DW300c In Tank Pumps
-Dw High Pressure FPR
-DSX AUX Kit
-ID1300 Injectors
-Radium Fuel Rails

Previously Installed:
-ALM Billet Hat
-DSX Flex Fuel Kit

Issues I'm seeing is at idle the car is only seeing 36-37 psi of rail pressure via Hp tuners & My Aeroforce Gauge. When shutting down Via my AeroForce it looks like pressure drops off immediately but im not to familiar if its suppose to hold any pressure while its off. I had my tuner come by my place to put a simple base tune in just for me to be able to drive it on a trailer to bring to the alignment shop and that's when he let me know about that psi concern. Now I made sure when I was installing everything to be extremely carful not to break ,crack, crush, or kink any lines or fittings. Everything installed flawlessly without leaks and fired up first time without issue but after doing some research I was faced with a bunch of different misleading information about the fuel rail pressure.

Some people say its normal for 09 & 10 V models, and some said it is not. Some say you need to have the FPCM programmed, while others didn't have issues lol. So I'm sure you can see already why I'm so confused and had to register on here to make a very specific post in hope someone can enlighten me on what my next steps should be. Below I will list everything I've checked so far.

-Tested Fuel Pump Power For Both Pumps
-FPCM Fuse
-Leaks
-Kinks
-Loose Fittings
-Fuel Hat Harness Connection

Any insight and advice would be greatly appreciated. Thank you =)


Wheel Car Tire Vehicle Automotive parking light


Current Mods:
-BTR Stage 3 Cam
-660 Lift Valve Springs
-Titanium Retainers
-Valve seals
-Chromoly pushrods
-Amp Ported Snout
-Solid Isolator
-Nick Williams 102 Throttle Body
-4.5 Inch Air Raid Intake
-Innovations West 9.1 Lower
-Metco Motorsports 2.5 Upper
- Wiener Reinforced Brick from Dedicated Motorsports
-Lingenfelter LSA Idler Relocation Bracket
-WeaponX Heat Exchanger
-Varimax HX Pump Kit
-1.7 Gallon B3R Underhood Ice Tank
-Moroso Catch Can
-Accel Ceramic Spark Plug Wires



Exhaust

-American Racing 2 in LongTubes
-American Racing 3in X-Pipe
-QTP Cutouts/MME Ground n Pound Turndowns
-Stock Mufflers



Fuel

-ID 1300 Injectors
-ALS Billet Stage 2 Fuel Hat
-DSX Aux Pump
-DSX Flex Fuel
-Dual Dw300 Fuel Pumps
-Dw High Pressure FPR
-Radium Billet Fuel Rails



Transmission

-Stock 6l90



Suspension

-Viking F. Double Adjustable Coil-overs Hyperco Springs
-Viking R.Triple Adjustable Coil-overs Menacer Springs
-Viking Shock Mounts
-TRZ Rear Trailing Arms
-Trz Rear Toe Rods
-Trz Rear Lower Control Arms
-Magride Delete



Brakes

-Front R1 Geo Diamond Cut Rotors
-Front Hawk HPS 5.0 Pads
-Baer Brakes & 2 Piece Rotors



Exterior/Interior

-3 Stage Paint Correction
-7 Year Ceramic Coating
-7 Year Ceramic Coated Titanium Interior
-Fog Lights
- 35W 5K FogLight HIDs
-Full Black Moon Products Front/Side/Rear Splitter
-Paint Matched Weapon X Power Hood
-Black Badgeless front Grills
-Tundra Upgraded Headlights W/Upgraded LED DRL
-35W 5k Headlight HIDs
-Paint Matched Rear Bumper Reflectors
-0FX2GV Badges
-3M Glass Back Wrapped Vinyl Roof
-Center Front Bumper Painted Black
-APR Carbon Fiber NACA Duct
-Carbontastics Flat Bottom Carbon Fiber Steering Wheel With Alcentara
-V Faces Aeromotive Gauge
-Fuel Pump Hatch Cover





Wheels & Tires

-19x9/19x11 Forgestar CF10 in Gloss Black
-18x8 Weld S71s W/Mickey Thompson Street Comp 255/45r18
-15x10 Weld S71 W/Hoosier DBR 28x10.5r15
 

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check pressure with actual gauge too as we have found not all ''rail pressure'' pids are reading correctly, some just seem to follow a delta offset or something even tho system is a mechanical reg manifold referenced and increases pressure with boost it pid will show it lowering, as a test if u have the fuel pressure sensor voltage make sure that 0-5v voltage varies like pressure
 
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The idle pressure is fine. For 09/10, low flow fuel pressure was 35 psi, after that it was bumped to 50 psi.

Your tuner can adjust this for you, however there is no issue idling with that pressure given fuel demand.

Regarding the pressure dropping off, that can be due to the hose you crimped onto the fuel pump manifold that was supplied with the ALM hat. It is not uncommon for this crimped hose to bleed pressure faster than the stock line that is installed by some heat shrink/ultrasonic method.

Do you have long crank issues? The real concern with the pressure bleeding off is that after the prime cycle when you first hit the key, it may bleed down and have trouble cranking instantly.
 

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Discussion Starter · #5 ·
The idle pressure is fine. For 09/10, low flow fuel pressure was 35 psi, after that it was bumped to 50 psi.

Your tuner can adjust this for you, however there is no issue idling with that pressure given fuel demand.

Regarding the pressure dropping off, that can be due to the hose you crimped onto the fuel pump manifold that was supplied with the ALM hat. It is not uncommon for this crimped hose to bleed pressure faster than the stock line that is installed by some heat shrink/ultrasonic method.

Do you have long crank issues? The real concern with the pressure bleeding off is that after the prime cycle when you first hit the key, it may bleed down and have trouble cranking instantly.
Spectacular information thank you !!

As for the cranking issues I do not have any she fires up fairly quick =).

check pressure with actual gauge too as we have found not all ''rail pressure'' pids are reading correctly, some just seem to follow a delta offset or something even tho system is a mechanical reg manifold referenced and increases pressure with boost it pid will show it lowering, as a test if u have the fuel pressure sensor voltage make sure that 0-5v voltage varies like pressure
Thank you for the input buddy!

Im not 100% sure if the V2 have a fuel pressure sensor, but if they do please tell me where it is located so I can check. =)
 

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Could you post a picture of the location if its not to much to ask?
Stick your head under the car just in front of right rear tire and look around a bit...its nestled between tank and rocker panel.
 
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