z06 fuel pump
Thread Starter
Burning Brakes
Joined: May 2007
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From: jax fl
z06 fuel pump
got a question, my fuel pump went out on my h/c/i/e 05 ls2 about a month ago. I ask the dealership to install the z06 fuel pump as i wanted more volume for a possible s/c they agreed as i have the gmpp warranty, but hesident as they did not want to warranty the job if the car had any issues with the different f/p. so i noticed the car wasn't running too rich when i got it back as i have an a/f gauge. and a/f was tipping to 15 16 17? so this has been an ongoing thing for a few weeks. and finally car starts to chug as if running out gas and a/f was showing off the chart lean. would let off the gas and it would come back a little a/f would come down a little to 15, well today is was doin the same thing so i rushed to the dealership to verify if the fuel pressure was dropping well as i pulled up to the service port the car just dies won't start no fuel pressure..?? left it at the dealership as i heard them say i wonder if the z06 fuel pump pulls to many volts, is this there way of not fixing the problem under warranty. and is the z06 fuel pump a direct swap with out any other modifications? waiting to hear back
Safety Car
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Z06 pump is a direct replacement. It will draw more amperage than the original pump but not enough to make a difference. Sounds like you have either a dead replacement pump or a shoddy R&R job. Fuel pressure gauge on the schrader valve on the front of the driver's side fuel rail will confirm whether you have no fuel pressure. Should read 55-60psi at idle. It sure sounds like a do-over to me and should be covered under warranty.
Thread Starter
Burning Brakes
Joined: May 2007
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From: jax fl
Z06 pump is a direct replacement. It will draw more amperage than the original pump but not enough to make a difference. Sounds like you have either a dead replacement pump or a shoddy R&R job. Fuel pressure gauge on the schrader valve on the front of the driver's side fuel rail will confirm whether you have no fuel pressure. Should read 55-60psi at idle. It sure sounds like a do-over to me and should be covered under warranty.
Burning Brakes
Joined: Nov 2005
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From: Houston MN
St. Jude Donor '10
Strange, my first "Z06" replacement pump lasted about 300 miles too. My second one is still going strong. I'm thinking you got a bad pump or a bad ground on the new pump. I would have them show you the old pump out of the vehicle hooked up to 12 volts. That way you know it was the pump that went bad.
Thread Starter
Burning Brakes
Joined: May 2007
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From: jax fl
Strange, my first "Z06" replacement pump lasted about 300 miles too. My second one is still going strong. I'm thinking you got a bad pump or a bad ground on the new pump. I would have them show you the old pump out of the vehicle hooked up to 12 volts. That way you know it was the pump that went bad.
Thread Starter
Burning Brakes
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From: jax fl
Safety Car
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From: Pinellas Park Fl
St. Jude Donor '08-'09 & '12, '14
Does anybody have anything that qualifies the Z06 pump as having more volume ?
Looking at the tunes there is noting different other than the injectors.
I just checked some aftermarket sources and they list one pump for either a base or Z06
Looking at the tunes there is noting different other than the injectors.
I just checked some aftermarket sources and they list one pump for either a base or Z06
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Thread Starter
Burning Brakes
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From: jax fl
Safety Car
Joined: Jan 2004
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From: Pinellas Park Fl
St. Jude Donor '08-'09 & '12, '14
I'm far from an engineer, but if the fuel line stays the same size and you are trying to push more volume, than the pressure will go up, since prerssure is a result of restriction, correct?
Thread Starter
Burning Brakes
Joined: May 2007
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From: jax fl
so motorhead what would my rebuttle be to the dealership when they say the pump is pulling more juice then the ls2 pump and is to hot for the circuit, as i heard them mention as they were looking at my fuse panel?
Safety Car
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From: Pinellas Park Fl
St. Jude Donor '08-'09 & '12, '14
On high HP motors, whether FI or NA, most systems go to a return system Vs our returnless.
So, if the standard vette FP is, let's say, 190 LPH is the Z pump rated at 240 LPH? If an aftermarket manufacture uses the same pt# for both vehicles, then I am assuming they flow the same or they be wrong, and I checked 2 manufactures. Just because the Z has a 427 Vs 366/378 doesn't mean the pump is larger. The injectors are, which increases volume to the engine.
Just looking for empirical data to support the theory that the Z has more volume. Just because the pt# are different at the dealer could just be a change in construction, a new clamp or color, who knows.
Last edited by glenB; Oct 23, 2011 at 10:11 AM.
Safety Car
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Again we go back to restriction Vs volume = pressure, so, increased volume should increase the pressure. If we maintain the pressure at 60# where is the increased volume?
On high HP motors, whether FI or NA, most systems go to a return system Vs our returnless.
So, if the standard vette FP is, let's say, 190 LPH is the Z pump rated at 240 LPH? If an aftermarket manufacture uses the same pt# for both vehicles, then I am assuming they flow the same. Just because the Z has a 427 Vs 366/378 doesn't mean the pump is larger. The injectors are, which increases volume to the engine.
Just looking for imperical data to support the theory that the Z has more volume. Just because the pt# are different at the dealer could just be a change in construction, a new clamp or color, who knows.
On high HP motors, whether FI or NA, most systems go to a return system Vs our returnless.
So, if the standard vette FP is, let's say, 190 LPH is the Z pump rated at 240 LPH? If an aftermarket manufacture uses the same pt# for both vehicles, then I am assuming they flow the same. Just because the Z has a 427 Vs 366/378 doesn't mean the pump is larger. The injectors are, which increases volume to the engine.
Just looking for imperical data to support the theory that the Z has more volume. Just because the pt# are different at the dealer could just be a change in construction, a new clamp or color, who knows.
Here's a great detailed source of information on how the fuel systems work in our Vettes....
http://www.corvetteactioncenter.com/...el+Tank+System
Safety Car
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...this is starting to sound as if their original "diagnosis" might have been off the mark
Last edited by Motorhead-47; Oct 23, 2011 at 10:21 AM.
Le Mans Master
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From: West coast CA
The volume of fuel consumed by engines is variable. A higher-volume constant-pressure pump can supply more fuel volume at the same pressure.
Last edited by torquetube; Oct 23, 2011 at 10:51 AM.
Safety Car
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From: Pinellas Park Fl
St. Jude Donor '08-'09 & '12, '14
The excess volume gets routed to the passenger side tank and supports the fuel transfer function from passenger side to driver's side tank
Here's a great detailed source of information on how the fuel systems work in our Vettes....
http://www.corvetteactioncenter.com/...el+Tank+System
Here's a great detailed source of information on how the fuel systems work in our Vettes....
http://www.corvetteactioncenter.com/...el+Tank+System
So aside from all the engineering, what do we have that says the Z pump flows more? Do we have a flow chart like Walbro has for their pumps?
Safety Car
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From: Pinellas Park Fl
St. Jude Donor '08-'09 & '12, '14
based on the OPs comment about the shop looking at the relay center makes me wonder if they misdiagnosed the original problem.
To increase the volume or pressure you need either a larger pump or more voltage to spin it faster or both. There is nothing in the tune or wiring diagram to indicate increased voltage. Same fuses, same relay, same size wire diameter, so, the pump would have to be larger, show me .....
more vanes? larger chamber? I don't know ...
Has anybody seen any manufacture pt# on the Z pump? It is my understanding is it's a Walbro pump, is that wrong info?
It's evident that the LS2/3 pump can supply enough fuel for over 500 RWHP. Doesn't the Edelbrock SC use the stock LS2/3 pump for it's base system? 554 Flywheel HP
Myself, if I wanted a drop-in pump for a SC system like the OP, I'd look at the ZR1 pump and it's parts. Their doing 600 wheel HP w/o add ons.
Safety Car
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Show me where the Z pump offers more volume, that's all I'm asking.
based on the OPs comment about the shop looking at the relay center makes me wonder if they misdiagnosed the original problem.
To increase the volume or pressure you need either a larger pump or more voltage to spin it faster or both. There is nothing in the tune or wiring diagram to indicate increased voltage. Same fuses, same relay, same size wire diameter, so, the pump would have to be larger, show me .....
more vanes? larger chamber? I don't know ...
Has anybody seen any manufacture pt# on the Z pump? It is my understanding is it's a Walbro pump, is that wrong info?
It's evident that the LS2/3 pump can supply enough fuel for over 500 RWHP. Doesn't the Edelbrock SC use the stock LS2/3 pump for it's base system? 554 Flywheel HP
Myself, if I wanted a drop-in pump for a SC system like the OP, I'd look at the ZR1 pump and it's parts. Their doing 600 wheel HP w/o add ons.
based on the OPs comment about the shop looking at the relay center makes me wonder if they misdiagnosed the original problem.
To increase the volume or pressure you need either a larger pump or more voltage to spin it faster or both. There is nothing in the tune or wiring diagram to indicate increased voltage. Same fuses, same relay, same size wire diameter, so, the pump would have to be larger, show me .....
more vanes? larger chamber? I don't know ...
Has anybody seen any manufacture pt# on the Z pump? It is my understanding is it's a Walbro pump, is that wrong info?
It's evident that the LS2/3 pump can supply enough fuel for over 500 RWHP. Doesn't the Edelbrock SC use the stock LS2/3 pump for it's base system? 554 Flywheel HP
Myself, if I wanted a drop-in pump for a SC system like the OP, I'd look at the ZR1 pump and it's parts. Their doing 600 wheel HP w/o add ons.
As for the Edelbrock supercharger you mentioned....if you step up from the 554hp (flywheel) to the 599hp kit the only difference in the two kits is a smaller pulley and ......a Z06 fuel pump! 100% of everything else is the same.
Safety Car
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Posts: 4,974
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From: Pinellas Park Fl
St. Jude Donor '08-'09 & '12, '14
ZR1 uses an entirely different variable speed pump and requires the associated onboard electronics to manage it...you would not want to try and go there $$$$. TJWONG posted up some detail on the ZR1 fuel system a while back.
As for the Edelbrock supercharger you mentioned....if you step up from the 554hp (flywheel) to the 599hp kit the only difference in the two kits is a smaller pulley and ......a Z06 fuel pump! 100% of everything else is the same.
As for the Edelbrock supercharger you mentioned....if you step up from the 554hp (flywheel) to the 599hp kit the only difference in the two kits is a smaller pulley and ......a Z06 fuel pump! 100% of everything else is the same.