Typical batch fire engine management.
The fuel vapor accumulates until the intake valve opens.
Not quite as bad as it sounds since idle pulse widths are small and valve
opening/closing events happen relatively fast.

-----Original Message-----
From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com] On Behalf Of
Gregor Brandt
Sent: Tuesday, June 02, 2009 9:52 PM
To: vanagon@GERRY.VANAGON.COM
Subject: Re: Why does the fuel pump cycle twice?

If the FI fire everytime a spark fires, and there are four plugs
sparking at different times, does that mean 3 times out of 4 we are
throwing fuel into a cylinder that is not firing?  Where does that
fuel go, is it wasted?

Gregor

On Tue, Jun 2, 2009 at 7:32 PM, Ken Lewis <kdlewis@northstate.net> wrote:
> Robert,
> That sounds like normal operation. The injectors fire every time a spark
> plug does. The fuel pump runs for a few second every time an injector
fires.
> When the engine is running the pump never times out and runs continuously.
> Ken Lewis
> http://neksiwel.20m.com/
> in statu viae
>