[alfa] fuel pumps, series vs. parallel

[Jeff Matson <jsm8@xxxxxxxxxxx>]

Richard writes:
>>besides, i don't know what happens if a fuel pump is receiving fuel 
at the intake at the same pressure
>>it's supposed to be supplying, and i'm not sure i want to find out.

and Brian writes:
>>The fuel pressure will be that of the highest pump (I think).

Brian is correct.  The basic theory is that pumps in parallel add their 
flowrates.  Pumps in series add their pressures.  So with a pair pf 
pumps that can each do 2 gpm at 2 psi, with them in parallel you will 
get 4 gpm at 2 psi, and with them in series you will get 2 gpm at 4 psi. 
For fuel pumps, this means you want to run them in parallel so you get 
the right fuel pressure.

Jeff Matson
Harvard, MA
'74 GTV 2000
'91 164 L
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