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06-25-2008
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#1 |
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Join Date: May 2008
Location: Livermore, California
Posts: 61
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Primary fuel pump
Hi,
Does anyone know which pump is the primary (the one on the top or the one on the bottom)? Thanks, Sal |
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06-26-2008
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#2 |
 
Join Date: Dec 2004
Location: Jacksonville, FL USA
Posts: 4,609
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Re: Primary fuel pump
out on a limb.......I think the bottom pump is the 1* pump. I'll go look in my FSM and report back later.
 Tom
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1990 ZR-1, Black/grey, #2233, stock. ZR-1 Net Reg Founding Member #316 & NCM member |
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06-26-2008
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#3 |
 
Join Date: Jul 2007
Location: Bartlett, IL
Posts: 7,156
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Re: Primary fuel pump
Page 6c-2 Figure 3 in my GM Service Manual States the bottom is the secondary, top is primary
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1990 Corvette ZR-1 #1051 Watson Headers (2" Primary) - Flowmaster Cats - Borla Catback Late Model IH - Plenum Coilovers - 4.10s Shelby Series 1 - Wilwood Brakes Custom Interior NCM Lifetime Member #978 |
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06-26-2008
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#4 |
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Join Date: May 2008
Location: Livermore, California
Posts: 61
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Re: Primary fuel pump
Thanks Guys - it is the top pump!!!!
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06-26-2008
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#5 |
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Join Date: Jun 2006
Location: Sparks, NV
Posts: 2,843
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Re: Primary fuel pump
Unless your strapped for cash, I suggest you replace both pumps while your in there. Those things are 18 or so years old and have to run constantly. I did both of mine and if I recall the pumps were only about $65 a piece. Good insurance and sure beats having to do it twice.
Hans 
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06-27-2008
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#6 |
Join Date: Aug 2005
Location: Scottsdale, AZ
Posts: 2,446
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Re: Primary fuel pump
Get both while you are in there
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