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rleffler
Joined: 05 Nov 2006
Posts: 680
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 Posted: Mon Oct 14, 2013 1:50 am Post subject: Mechanical fuel pump pressure |
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I'm looking for the amount of fuel pressure that the mechanical fuel pump (engine attached) on a yio-540-d4a5 is supposed to yield. Aircraft Spruce's listing states 25-30psi. Is this what I should expect?
The reason I'm asking is that mine is only generating about 23 psi.
Is there any effective way to test, short of taking it off and sending back to Lycoming or a certified shop?
Thanks,
Bob
Sent from my iPad
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Bob Leffler
N410BL - Phase I
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Kelly McMullen
Joined: 16 Apr 2008
Posts: 1188
Location: Sun Lakes AZ
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| Posted: Mon Oct 14, 2013 5:05 am Post subject: Mechanical fuel pump pressure |
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23 is fine. The Bendix fuel injection needs approx. 15 psi as a minimum. 30 is generally considered a maximum. I don't know why Spruce lists the numbers they do.
On Mon, Oct 14, 2013 at 2:50 AM, Bob Leffler <rv(at)thelefflers.com (rv(at)thelefflers.com)> wrote:
| Quote: | --> RV10-List message posted by: Bob Leffler <rv(at)thelefflers.com (rv(at)thelefflers.com)>
I'm looking for the amount of fuel pressure that the mechanical fuel pump (engine attached) on a yio-540-d4a5 is supposed to yield. Aircraft Spruce's listing states 25-30psi. Is this what I should expect?
The reason I'm asking is that mine is only generating about 23 psi.
Is there any effective way to test, short of taking it off and sending back to Lycoming or a certified shop?
Thanks,
Bob
Sent from my iPad
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Kelly McMullen
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Mauledriver(at)nc.rr.com
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| Posted: Mon Oct 14, 2013 5:31 am Post subject: Mechanical fuel pump pressure |
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Bob, I took a look in the Operators manual. It seems to indicate that
between 14 to 45psi is normal for input to the fuel injector.
I took a look at a few random flight logs and see that my fuel pressure
stays between 18 and 21 psi. I think I have the alarm set at 15psi and
it has gone off a few times over the last 300+ hours. During climb on a
hot day as I recall but not sure. I haven't been concerned.
Bill
On 10/14/2013 5:50 AM, Bob Leffler wrote:
| Quote: |
I'm looking for the amount of fuel pressure that the mechanical fuel pump (engine attached) on a yio-540-d4a5 is supposed to yield. Aircraft Spruce's listing states 25-30psi. Is this what I should expect?
The reason I'm asking is that mine is only generating about 23 psi.
Is there any effective way to test, short of taking it off and sending back to Lycoming or a certified shop?
Thanks,
Bob
Sent from my iPad
|
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Bob Turner
Joined: 03 Jan 2009
Posts: 885
Location: Castro Valley, CA
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| Posted: Mon Oct 14, 2013 7:37 am Post subject: Re: Mechanical fuel pump pressure |
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I agree with the above post.
Bob, if you bought the engine thru Vans you should have received a white binder with all the numbers in it.
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Bob Turner
RV-10 QB |
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Bob Turner
Joined: 03 Jan 2009
Posts: 885
Location: Castro Valley, CA
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| Posted: Mon Oct 14, 2013 7:37 am Post subject: Re: Mechanical fuel pump pressure |
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I agree with the above post.
Bob, if you bought the engine thru Vans you should have received a white binder with all the numbers in it.
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Bob Turner
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rleffler
Joined: 05 Nov 2006
Posts: 680
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| Posted: Mon Oct 14, 2013 9:57 am Post subject: Re: Mechanical fuel pump pressure |
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I missed it when I flipped through the manual early this morning. It indeed states the numbers that Bill mentioned.
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Bob Leffler
N410BL - Phase I
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Mauledriver(at)nc.rr.com
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| Posted: Mon Oct 14, 2013 1:43 pm Post subject: Mechanical fuel pump pressure |
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BTW, that kind of thing will happen a lot as you transition from
building to flying and maintaining, at least it did to me.
Just when I got near the top of learning curve I suddenly found myself
staring up at another. However, whenever I found my self sitting in the
pilot's seat making airplane noises, I was at 5,000' and 170
knots....and there was no fiberglass dust!
Bill "leaving this little knot of gray rainy weather for FL soon" Watson
On 10/14/2013 1:57 PM, rleffler wrote:
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rv10flyer
Joined: 25 Aug 2009
Posts: 364
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| Posted: Tue Oct 15, 2013 8:16 pm Post subject: Re: Mechanical fuel pump pressure |
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Mine runs 28-29 in cruise, 20-25 in a steep hot full power climb. Check actual pressure with a gage setup.
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Wayne G. |
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