hey, I did a quick search and I couldn't find the flow specs on the stock zr1 fuel pumps. Anyone know of a link to this info?
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2004 Jaguar S type R. 4.2L V8 w/ Stiegemeier Snakebite Eaton M112 w/Alky Injection. H&R springs...
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Off the cuff thought...... The secondary pump value may mean primary & secondary combined flow rate. The spec sheet doesn't actually say flow rate frome each pump individually. Seems reasonable , considering (1)the volume would most likely be rated at the single, outlet pipe for the assembly(actually stated as 7.9mm), (2) the secondary pump is only intended to run in conjunction with the primary under normal conditions and (3) it is a modular design, i.e. a single unit.
Additional support also comes in the form of the known, proven feasibility of replacing either or both of the stock OEM pumps with identical "Suburban" pumps.
I would think even if the 2ndary pump were higher flow, that you could still put it in place of the primary? I mean what would it hurt as long as the return line is big enough to return the excess.
I don't know much about fuel flow though. Jerry that could be the case that it's a combined rating. If 26g/s were the combined flow, is that enough for the 4-500hp that people run? Is there a calc/estimate for fuel flow vs horsepower?
Hmm, actually... So the injectors are rated at 22 lbs/hr by Delphi. that is ~2.77 g/s. So multiply that by 16 and you get a max fuel flow via the injectors of 44 g/s. I would tend to think then that the fuel pumps would be sized to deliver somewhere in that neighborhood. If the primary and secondary flow #'s were per pump that would be around 42 g/s, which maybe makes sense.
But I am no car designer and am still just guessing.
It gets fairly deep in just a quick look at calculating fuel requirements for a specific horsepower output. The calcs also include some variables and safety factors that need to be considered. I'm sure fuel pump delivery also has safety factors and variables such as pump efficiency that will certainly decline over time/use. Fuel pump output almost certainly is rated at the modular unit output and would not take into account pressure drop in the fuel line & fuel filter.
You can go to RC injectors website and obtain injector sizing requirements relative to power output, but there are still factors such a BSFC, duty cycle and fuel pressure at the rail.
Still, there certainly is some ambiguity in the way the pump output is stated by Delphi. Considerable good fortune would probably be required to actually get to talk to someone at Delphi who actually knew the answer for certain.
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If the primary and secondary flow #'s were per pump that would be around 42 g/s, which maybe makes sense.
guys, when you replace the pumps, are you going with the black things that come on there from the factory or just replacing them with stainless hose clamps? Also, are you replacing the hose at too while you have the sending unit out of the tank? The reason I ask is because the hose is shaped weird so coming up with a replacement isn't as easy as i would have thought.
I would think even if the 2ndary pump were higher flow, that you could still put it in place of the primary? I mean what would it hurt as long as the return line is big enough to return the excess.
I don't know much about fuel flow though. Jerry that could be the case that it's a combined rating. If 26g/s were the combined flow, is that enough for the 4-500hp that people run? Is there a calc/estimate for fuel flow vs horsepower?
Bob/Jerry
The "PUMP/SENDER" that you chose for a '99 IS NOT what is used for service pumps for a ZR-1. The # you chose is an assembly/module for use in a completely different "tank supply" system on a suburban. Take a look at the illustration of the part! I posted the specs of the "Delphi" pump for the correct service # in my earlier post. If you're using the Delphi "drop down" use 1996 2500 Suburban!! Actually the service pump has applications for "all" truck applications '96.
The "PUMP/SENDER" that you chose for a '99 IS NOT what is used for service pumps for a ZR-1. The # you chose is an assembly/module for use in a completely different "tank supply" system on a suburban. Take a look at the illustration of the part! I posted the specs of the "Delphi" pump for the correct service # in my earlier post. If you're using the Delphi "drop down" use 1996 2500 Suburban!! Actually the service pump has applications for "all" truck applications '96.
I was really just trying to find the flow #'s. The link you provided also says it flows 28 g/s. So perhaps that is about what the secondary pump on the ZR-1 flows. Or maybe it's way more but is the same size with the same connector, thus making it a workable replacement.
I guess if one were so inclined, it really wouldn't be super difficult to test, right? Put the output hose in something, supply voltage to one pump or the other for maybe 30 seconds and see how much liquid it pumps out?
I mentioned it primarily because someone sees the part # and then attempts to find an interchange or foolishly orders with no confirmation they'll be quite disappointed with it's cost and also the fact it's not a "service" pump but a "module" for nothing similar nor can it be disassembled to work. Then someone carries on about the "misinformation" of the Internet!
Delphi isn't OE! Delphi is an aftermarket supplier whose product was offered to many AC/Delco jobbers etc as a "competitive" product in the market place. They purchased, were given or whatever some tooling, excess stock, engineering prints etc (my thoughts) and the product line never took off. In the past 18 months or so some/most of the "older model" AC/Delco line has become "re-badged" maybe Delphi product and most is "off shore" origin!
GM / AC Delco never published engineering specifications, if you wanted to duplicate it you "bought it" and reverse engineered it! Is the Delphi published information the GM / AC Delco specifications? I don't know!!
In todays market place and you wanted a pump that performed you would buy it, test it then consider it's use. You might do this a few times! The box/brand isn't of significance "most times"!!
guys, when you replace the pumps, are you going with the black things that come on there from the factory or just replacing them with stainless hose clamps? Also, are you replacing the hose at too while you have the sending unit out of the tank? The reason I ask is because the hose is shaped weird so coming up with a replacement isn't as easy as i would have thought.
Replace the black things with ss clamps & turn the screw out of the way for easier replacement of the module. I have re-used the hose.
I mentioned it primarily because someone sees the part # and then attempts to find an interchange or foolishly orders with no confirmation they'll be quite disappointed with it's cost and also the fact it's not a "service" pump but a "module" for nothing similar nor can it be disassembled to work. Then someone carries on about the "misinformation" of the Internet!
Corvette Store
ZR-1 fuel pump specs
