Fuel system
Thread Starter
Racer
Joined: Feb 2007
Posts: 265
Likes: 5
Fuel system
Out of curiosity, why can't the late 03-04 corvette's get a single in tank fuel pump to support 7-800 hp. The 2003+ Dodge viper is a dead head system that can handle 800hp at the crank. Is it the size of the fuel rails or issue with the regulator or something else.I know A&A and ECS have dual pump style systems, but a single pump would be nice.
Has anyone ever tried making an access panel in the trunk to get to the factory pump to eliminate dropping the whole tank process?
Just thinking...
Has anyone ever tried making an access panel in the trunk to get to the factory pump to eliminate dropping the whole tank process?
Just thinking...
Race Director
Joined: Sep 2001
Posts: 14,668
Likes: 749
From: NEwhere Ohio
Also, there is a return line on the c4.
So on earlier corvettes, this is not an issue !
Safety Car
Joined: Jun 2004
Posts: 4,353
Likes: 22
From: Bella Vista Ca
For the vette 03-04 vette best option is an external pump running only under boost.
Last edited by Mike04; Jul 12, 2010 at 11:17 PM.
Thread Starter
Racer
Joined: Feb 2007
Posts: 265
Likes: 5
Melting Slicks
Joined: Nov 2007
Posts: 2,197
Likes: 2
From: Niagara Falls NY
St. Jude Donor '08-'09
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Safety Car
Joined: Jun 2004
Posts: 4,353
Likes: 22
From: Bella Vista Ca
Buying parts is getting old and expensive, I'll never get rid of the mod fever that got me to this point though.... I mod one and the other feels slow, it's a vicious cycle 
I need to upgrade my stock pump (its getting tired and the 427 likes lots of fuel before the external kicks in). Any details on the C6 ZO6 pump? I always thought that would be an option, never found flow rate data or a write up to verify direct fit in an 04.
Any info on the ZR1 Pump?
I need to upgrade my stock pump (its getting tired and the 427 likes lots of fuel before the external kicks in). Any details on the C6 ZO6 pump? I always thought that would be an option, never found flow rate data or a write up to verify direct fit in an 04.
Any info on the ZR1 Pump?
Thread Starter
Racer
Joined: Feb 2007
Posts: 265
Likes: 5
Buying parts is getting old and expensive, I'll never get rid of the mod fever that got me to this point though.... I mod one and the other feels slow, it's a vicious cycle
I need to upgrade my stock pump (its getting tired and the 427 likes lots of fuel before the external kicks in). Any details on the C6 ZO6 pump? I always thought that would be an option, never found flow rate data or a write up to verify direct fit in an 04.
Any info on the ZR1 Pump?
I need to upgrade my stock pump (its getting tired and the 427 likes lots of fuel before the external kicks in). Any details on the C6 ZO6 pump? I always thought that would be an option, never found flow rate data or a write up to verify direct fit in an 04.
Any info on the ZR1 Pump?
Burning Brakes
Joined: Oct 2005
Posts: 1,089
Likes: 82
From: Kauhava, Finland
I found this 'bout year ago. Unfortunately I don't remember where I got this info and googling quickly just shows my own post in other forum...
Anyway, it seems that ZR1 fuel system is quite different compared to ordinary C6 and late C5's.
Electronic Returnless Fuel System (ERFS)
The electronic returnless fuel system is a microprocessor controlled fuel delivery system which transports fuel from the tank to the fuel rails. It functions as an electronic replacement for a traditional, mechanical fuel pressure regulator. A pressure vent valve within the fuel tank provides an added measure of over-pressure protection.
The electronic returnless fuel system (ERFS) is a demand based system which uses a fuel pump driven by a dedicated controller, the fuel pump control module (FPCM).
Desired fuel pressure is commanded by the ECM and transmitted to the FPCM via a GMLAN message. A liquid fuel pressure sensor provides the feedback the FPCM requires for Closed Loop fuel pressure control. For the GMX 245 SS application, the FPCM drives the fuel pump control module relay, also referred to as the fuel pump delivery control module, to control the brushless, 3-phase fuel pump.
Fuel Pump Control Module (FPCM)
The fuel pump flow control module (FPCM) is a serviceable GMLAN device mounted on the left, rear corner under the rear compartment floor panel carpet of the vehicle. The FPCM receives the desired fuel pressure message from the engine control module (ECM) and drives the FPCM relay to control the 3-phase fuel pump, located within the fuel tank, to achieve the desired fuel pressure. A liquid pressure sensor provides fuel pressure feedback to the FPCM.
The FPCM provides a control enable input to the FPCM relay to turn the 3-phase fuel pump ON and OFF. The control enable input is switched to ground to turn ON the pump. The FPCM also sends a 400 HZ pulse width module (PWM) signal to the FPCM relay to control the fuel pump speed by varying the duty cycle of this signal.
Fuel Pump Control Module Relay
The fuel pump control module (FPCM) relay is a serviceable device mounted on the left, rear corner under the rear compartment floor panel carpet of the vehicle. The FPCM relay communicates with the FPCM via CAN serial data. The FPCM relay diagnostics are reported out via the FPCM.
The FPCM relay controls the brushless, 3-phase fuel pump by providing variable, continuous PWM speed control. The nominal current supplied to the fuel pump is 15 amps, with a maximum limit of 25 amps.
Fuel Pressure Sensor
The fuel pressure sensor is a serviceable 5-volt, 3-pin device. It is located on the fuel feed line forward of the fuel tank, and receives power and ground from the fuel pump control module (FPCM) through a vehicle wiring harness. The sensor provides a fuel pressure signal to the FPCM, which is used to provide Closed Loop fuel pressure control.
Fuel Pressure Regulator
The fuel pressure regulator attaches to the fuel return pipe on the fuel sender assembly. The fuel pressure regulator is a diaphragm-operated relief valve. A software bias compensates the injector on-time because the fuel pressure regulator is not referenced to manifold vacuum. The injector pulse width varies with the signal from the mass air flow (MAF)/intake air temperature (IAT) sensor.
With the engine running at idle, the system fuel pressure at the pressure test connection should be between 240-265 kPa (35-39 psi). With the system pressurized and the pump OFF the pressure should stabilize and hold. If the pressure regulator supplies a fuel pressure which is too low or too high, a driveability condition will result.
Anyway, it seems that ZR1 fuel system is quite different compared to ordinary C6 and late C5's.
Electronic Returnless Fuel System (ERFS)
The electronic returnless fuel system is a microprocessor controlled fuel delivery system which transports fuel from the tank to the fuel rails. It functions as an electronic replacement for a traditional, mechanical fuel pressure regulator. A pressure vent valve within the fuel tank provides an added measure of over-pressure protection.
The electronic returnless fuel system (ERFS) is a demand based system which uses a fuel pump driven by a dedicated controller, the fuel pump control module (FPCM).
Desired fuel pressure is commanded by the ECM and transmitted to the FPCM via a GMLAN message. A liquid fuel pressure sensor provides the feedback the FPCM requires for Closed Loop fuel pressure control. For the GMX 245 SS application, the FPCM drives the fuel pump control module relay, also referred to as the fuel pump delivery control module, to control the brushless, 3-phase fuel pump.
Fuel Pump Control Module (FPCM)
The fuel pump flow control module (FPCM) is a serviceable GMLAN device mounted on the left, rear corner under the rear compartment floor panel carpet of the vehicle. The FPCM receives the desired fuel pressure message from the engine control module (ECM) and drives the FPCM relay to control the 3-phase fuel pump, located within the fuel tank, to achieve the desired fuel pressure. A liquid pressure sensor provides fuel pressure feedback to the FPCM.
The FPCM provides a control enable input to the FPCM relay to turn the 3-phase fuel pump ON and OFF. The control enable input is switched to ground to turn ON the pump. The FPCM also sends a 400 HZ pulse width module (PWM) signal to the FPCM relay to control the fuel pump speed by varying the duty cycle of this signal.
Fuel Pump Control Module Relay
The fuel pump control module (FPCM) relay is a serviceable device mounted on the left, rear corner under the rear compartment floor panel carpet of the vehicle. The FPCM relay communicates with the FPCM via CAN serial data. The FPCM relay diagnostics are reported out via the FPCM.
The FPCM relay controls the brushless, 3-phase fuel pump by providing variable, continuous PWM speed control. The nominal current supplied to the fuel pump is 15 amps, with a maximum limit of 25 amps.
Fuel Pressure Sensor
The fuel pressure sensor is a serviceable 5-volt, 3-pin device. It is located on the fuel feed line forward of the fuel tank, and receives power and ground from the fuel pump control module (FPCM) through a vehicle wiring harness. The sensor provides a fuel pressure signal to the FPCM, which is used to provide Closed Loop fuel pressure control.
Fuel Pressure Regulator
The fuel pressure regulator attaches to the fuel return pipe on the fuel sender assembly. The fuel pressure regulator is a diaphragm-operated relief valve. A software bias compensates the injector on-time because the fuel pressure regulator is not referenced to manifold vacuum. The injector pulse width varies with the signal from the mass air flow (MAF)/intake air temperature (IAT) sensor.
With the engine running at idle, the system fuel pressure at the pressure test connection should be between 240-265 kPa (35-39 psi). With the system pressurized and the pump OFF the pressure should stabilize and hold. If the pressure regulator supplies a fuel pressure which is too low or too high, a driveability condition will result.
