-------------- Original message from Perry Casson <pcasson@sasktel.net>: --------------


> Had a small issue on my last flight that I can not explain - anyone care
> to venture a guess what was going on?
>
> I was hmmmm-ing along at 7500' on friday about 60 minutes into a 2 hour
> flight when my EIS low fuel pressure alarm went off and fuel pressure
> had dropped to 29 psi (alarm set at 30 psi) and the engine went a bit
> lean. I switched on my backup pump and fuel pressure instantly went
> back to the normal 38 psi. Flew like that for a couple minutes and then
> decided to do I bit of investigation so I turn the backup pump back off
> but the fuel pressure remain at the normal 38 psi for the rest of the
> flight. No other problems other than I seem to be running a bit leaner
> than normal for a 12 o-clock setting on the EC-2 mixture control.
>
> My install is pretty much a clone of Tracy's pre-Renisis fuel system
> other than I've got a high wing (Glastar). Feed and return from left
> tank, fuel line y after a fuel shutoff valve, inline fuel filters
> upstream of parallel Federal Mogul pumps mounted on cockpit side of
> firewall, using stock 89 RX-7 pressure regulator, 88 NA Injectors, no
> damper.
>
> I've been try to come with a explanation that would account for such a
> issue and other than the fuel pressure regulator may have got stuck and
> the extra flow from turning on the second pump unstuck it.
>
> Perry Casson
>
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