Today's Message Index:
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1. 06:40 AM - Re: AFP and fuel pressure and fuel pump (Richard Martin)
2. 09:06 AM - AFP and fuel pressure and fuel pump (George Inman)
Message 1
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| Subject: | Re: AFP and fuel pressure and fuel pump |
I have experienced 5 or 6 fuel pumps during the 2000 hours that I have on
my RV8. They usually last 400 or 500 hours, however, I just replaced one
(they warrantied it) that failed in less than 25 hours. I have an IO390 lyc
engine . I also use a Airflow Performance electric standby fuel pump. The
standby pumps usually last indefinetly.
Good Luck
Dick Martin
RV8 N233M
the fast one
On Wed, Nov 3, 2010 at 11:17 AM, <wgill10@comcast.net> wrote:
> Tom,
>
>
> I occasionally experience the same problem, but it seems to be related to
> having full tanks -- perhaps the fuel vent line is full of fuel causing the
> pump to work harder. If I switch tanks, the pressure returns to 25psig.
> Again, it only happens with full tanks and usually lasts no longer than a
> minute or so...been that way since first flight almost 800 hours ago.
>
>
> Best I,
>
>
> Bill
>
> RV-7 N151WP
>
> Lees Summit, MO
>
>
> ----- Original Message -----
> From: "thomas sargent" <sarg314@gmail.com>
> To: "rv-list" <rv-list@matronics.com>
> Sent: Wednesday, November 3, 2010 10:43:43 AM
> Subject: RV-List: AFP and fuel pressure and fuel pump
>
> I have the AFP fuel injection unit on my RV-6A and a VM-1000 to monitor the
> fuel pressure. When I first started flying it (about 15 hours ago) the fuel
> pressure read about 26 psi running on the engine driven pump and would go to
> 27 when I switched on the boost pump. The pressure produced by the engine's
> pump has slowy been decreasing. It now shows about 24psi and even 23psi
> once. Turning on the boost pump always brings it back to the 26 - 27 range
> (after a brief surge up to 35 or so). The engine seems to run OK either
> way.
>
> So, I think the pressure sensor is OK. Is it normal for a fuel pump to sag
> a little in the first 15 hours of operation, or do I have a nascent problem
> on my hands?
>
> Does any one know the miinimum fuel pressure that AFP needs?
>
> Thanks,
>
> --
> Tom Sargent, RV-6A
>
> *
>
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>
Message 2
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| Subject: | AFP and fuel pressure and fuel pump |
I have a Bendix FI on my O360
In flight fuel pressure is about 24 with boost off
about 27 with boost on
If I am slow taxiing with a warm engine it drops to about 17
--
George H. Inman
ghinman@mts.net
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