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rhdudley1(at)bellsouth.ne
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 Posted: Fri Sep 28, 2007 11:05 am Post subject: Low Fuel Pressure |
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Hi Pete,
I have had similar experiences with Van's fuel pressure gauge though never to 1 psi. I see variations from the bottom of the green arc to middle of the green arc. There has never been any indication from the engine of lack of fuel. The indications seem to be independent of power. The boost pump will sometimes bring the indication to mid green when it is at the bottom of the green arc on engine driven pump alone. The variations seem to occur randomly.
I have an O-320-D1A with about 130 hours on it since new.
Richard in Orlando
RV-6A
PeterHunt1(at)aol.com (PeterHunt1(at)aol.com) wrote:
[quote] With the boost pump off, my fuel pressure in flight normally stays around the bottom of the green arc (Van's gauge). Yesterday I was flying 22 squared and saw that my fuel pressure had dropped to 1 psi which is just a fraction above the red line. The engine ran fine, but I got very concerned. I turned the boost pump on which slowly boosted the pressure up to the bottom of the green arc, but no higher. Normally with the boost pump on (such as on takeoff) I can get the pressure up to 5 psi (top of the green arc). During landing, with the power pulled back, the fuel pressure rose and behaved normally. I am concerned that for a period my fuel pressure dropped almost to the red line. Have any of you had a similar experience? (My mechanical fuel pump diaphragm is not leaking and my fuel lines are plumbed as per Vans.)
Pete, in Clearwater
RV-6, 250 hours
See w target="_blank">Make AOL Your Homepage.
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ronlee(at)pcisys.net
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| Posted: Fri Sep 28, 2007 11:19 am Post subject: Low Fuel Pressure |
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Tis normal in my RV. I biased my RMI engine monitor to add 1 psi
so it would not constantly blink. Otherwise it was often ZERO in flight
The engine has run fine for over 1200 hours this way.
Ron Lee
[quote] ---
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dale1rv6(at)comcast.net
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| Posted: Fri Sep 28, 2007 11:34 am Post subject: Low Fuel Pressure |
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Me too. Using grand Rapids EIS, same low readings. No problems in operation. Also adjusted EIS formula to get reading of 3 as my new base. In last 200 hours has been consistent.
Dale
RV6a
0-360 A1A 925 hours
Do not archive
From: owner-rv-list-server(at)matronics.com [mailto:owner-rv-list-server(at)matronics.com] On Behalf Of Ron Lee
Sent: Friday, September 28, 2007 3:19 PM
To: rv-list(at)matronics.com
Subject: [Norton AntiSpam] Re: Low Fuel Pressure
Tis normal in my RV. I biased my RMI engine monitor to add 1 psi
so it would not constantly blink. Otherwise it was often ZERO in flight
The engine has run fine for over 1200 hours this way.
Ron Lee
[quote]
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khorton01(at)rogers.com
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| Posted: Fri Sep 28, 2007 1:46 pm Post subject: Low Fuel Pressure |
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On 28 Sep 2007, at 14:46, PeterHunt1(at)aol.com (PeterHunt1(at)aol.com) wrote:
| Quote: | With the boost pump off, my fuel pressure in flight normally stays around the bottom of the green arc (Van's gauge). Yesterday I was flying 22 squared and saw that my fuel pressure had dropped to 1 psi which is just a fraction above the red line. The engine ran fine, but I got very concerned. I turned the boost pump on which slowly boosted the pressure up to the bottom of the green arc, but no higher. Normally with the boost pump on (such as on takeoff) I can get the pressure up to 5 psi (top of the green arc). During landing, with the power pulled back, the fuel pressure rose and behaved normally. I am concerned that for a period my fuel pressure dropped almost to the red line. Have any of you had a similar experience? (My mechanical fuel pump diaphragm is not leaking and my fuel lines are plumbed as per Vans.)
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What was the altitude when you noticed the low fuel pressure, and how long had it been since you climbed to that altitude? I've seen some reports that suggest that some of the commonly used fuel pressure senders are not very well vented, and it can take some time after you climb for the pressure on the ambient side of its diaphragm to actually decrease to the local ambient pressure. This causes the pressure to read lower than the actual pressure.
--
Kevin Horton
RV-8 (Finishing Kit)
Ottawa, Canada
http://www.kilohotel.com/rv8
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HCRV6(at)comcast.net
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| Posted: Fri Sep 28, 2007 9:11 pm Post subject: Low Fuel Pressure |
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