What are the specs on the stock fuel pump(s)?
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TECH Apprentice
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From: CA
What are the specs on the stock fuel pump(s)? I was going to change my stock fuel pump but then my mechanic told me there are two of them. Does anyone know the real details about them? It may vary depending on year too, I have a 99. What is the most someone has run on them before starting to see them starve the engine?
Thanks!
Thanks!
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TECH Apprentice
Joined: Dec 2001
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From: CA
Re: What are the specs on the stock fuel pump(s)? [quote]Originally posted by Godspeed:
<strong>The fuel pumps in your 99 are good up to 525RWHP.
-Jeremy</strong><hr></blockquote>
Any idea on the actual output of the pumps? If I need to upgrade them, would I need to upgrade both pumps or should I just put one inline pump after the fuel filter?
Thanks!
<strong>The fuel pumps in your 99 are good up to 525RWHP.
-Jeremy</strong><hr></blockquote>
Any idea on the actual output of the pumps? If I need to upgrade them, would I need to upgrade both pumps or should I just put one inline pump after the fuel filter?
Thanks!
On The Tree
Joined: Jan 2002
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From: Northbrook, IL
Re: What are the specs on the stock fuel pump(s)? [quote]Originally posted by Godspeed:
<strong>The fuel pumps in your 99 are good up to 525RWHP.
-Jeremy</strong><hr></blockquote>
Is this also true for the 2001 C5s? I know the 01's have smaller injectors
<strong>The fuel pumps in your 99 are good up to 525RWHP.
-Jeremy</strong><hr></blockquote>
Is this also true for the 2001 C5s? I know the 01's have smaller injectors
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From: Godspeed
Re: What are the specs on the stock fuel pump(s)? [quote]Is this also true for the 2001 C5s? I know the 01's have smaller injectors
<hr></blockquote>
They injector sizes do vary from year to year, I will have to check on the fuel pumps. Just because you run out of injector doesn't necessarily mean you are out of fuel pump. You could be running 450RWHP NA for example and still have enought fuel pump to deliver a wet 75-100 shot of nitrous for example.
-Jeremy
<hr></blockquote>
They injector sizes do vary from year to year, I will have to check on the fuel pumps. Just because you run out of injector doesn't necessarily mean you are out of fuel pump. You could be running 450RWHP NA for example and still have enought fuel pump to deliver a wet 75-100 shot of nitrous for example.
-Jeremy
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TECH Apprentice
Joined: Dec 2001
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From: CA
Re: What are the specs on the stock fuel pump(s)? [quote]Originally posted by Godspeed:
<strong>
They injector sizes do vary from year to year, I will have to check on the fuel pumps. Just because you run out of injector doesn't necessarily mean you are out of fuel pump. You could be running 450RWHP NA for example and still have enought fuel pump to deliver a wet 75-100 shot of nitrous for example.
-Jeremy</strong><hr></blockquote>
Thanks Godspeed. I guess this kind of information is not common knowledge. It seems even Nick doesn't really know. I find it kind of odd that 2 fuel pumps would have such a low limit. I guess I'll wait until I see fuel pressure drop before doing anything about it. I remember SW ran with the stock fuel system for awhile in his 422+N2O.
Does anyone sell the fuel pump canister that you drop in the fuel tank with the fuel pump already upgraded?
<strong>
They injector sizes do vary from year to year, I will have to check on the fuel pumps. Just because you run out of injector doesn't necessarily mean you are out of fuel pump. You could be running 450RWHP NA for example and still have enought fuel pump to deliver a wet 75-100 shot of nitrous for example.
-Jeremy</strong><hr></blockquote>
Thanks Godspeed. I guess this kind of information is not common knowledge. It seems even Nick doesn't really know. I find it kind of odd that 2 fuel pumps would have such a low limit. I guess I'll wait until I see fuel pressure drop before doing anything about it. I remember SW ran with the stock fuel system for awhile in his 422+N2O.
Does anyone sell the fuel pump canister that you drop in the fuel tank with the fuel pump already upgraded?
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From: Godspeed
Re: What are the specs on the stock fuel pump(s)? I belive the pumps are both 112lph for 1999+ and 114lph for 1997-1998. Having two fuel pumps feeding the same line doesn't double the amount they flow. For example if the single pump could support say 450RWHP, then having the second pump would only support 525RWHP. Really what the second pump does is to help keep the fuel pressure up.
Here is an idea though. In the F-body's Nick/ARE installs double Walbro in-tank pumps to replace the single factory in-tank pump. How about we take this to the next level and replace both of the C5 in-tank pumps with a double pump setup - giving a total of 4 in-tank pumps! I'm sure that setup could easily support 800RWHP. In fact I used a single Walbro in-tank pump before at 600RWHP, but it really needed upgrading.
Another thing Nick/ARE have done on the C5 is to install a seperate pump just for the nitrous system. Use the stock pumps to supply the injectors and the motor NA, and then use the second pump to feed the nitrous system. This second pump could be tapped into the main fuel tank, or you could add a seperate fuel cell for it - in effect building a seperate fuel system. Of course this requires the addition of another fuel pressure regulator, fuel filter, and fuel line to the front. This is what I plan to do with my car ultimately - just build a complete seperate fuel system for the nitrous. <img src="graemlins/gr_cheers.gif" border="0" alt="[cheers]" />
-Jeremy
Here is an idea though. In the F-body's Nick/ARE installs double Walbro in-tank pumps to replace the single factory in-tank pump. How about we take this to the next level and replace both of the C5 in-tank pumps with a double pump setup - giving a total of 4 in-tank pumps! I'm sure that setup could easily support 800RWHP. In fact I used a single Walbro in-tank pump before at 600RWHP, but it really needed upgrading.
Another thing Nick/ARE have done on the C5 is to install a seperate pump just for the nitrous system. Use the stock pumps to supply the injectors and the motor NA, and then use the second pump to feed the nitrous system. This second pump could be tapped into the main fuel tank, or you could add a seperate fuel cell for it - in effect building a seperate fuel system. Of course this requires the addition of another fuel pressure regulator, fuel filter, and fuel line to the front. This is what I plan to do with my car ultimately - just build a complete seperate fuel system for the nitrous. <img src="graemlins/gr_cheers.gif" border="0" alt="[cheers]" />
-Jeremy
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TECH Enthusiast
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From: Godspeed
Re: What are the specs on the stock fuel pump(s)? Also with SW when he sprays you can bet he is using race gas in-tank at least 104 octane, which helps hold his motor together during those 10 second passes. <img src="gr_stretch.gif" border="0">
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TECH Apprentice
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From: Texas
Re: What are the specs on the stock fuel pump(s)? BUT, SW dyno's in the 550rwhp range with just the motor and then hits another 135 shot(wet) of nitrous. It would appear the pump is capable of more the 525hp and the limiting factor being the injectors. If the pump could only support 525rwhp, then even 104 Octane couldn't stop that 422 from Ka-Boom when the nitrous button is hit.