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Low fuel pressure injected engine

 
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mdelsol(at)md-dsl.fr
Guest
PostPosted: Fri Jun 28, 2013 10:54 am    Post subject: Low fuel pressure injected engine Reply with quote
Hello to all,

While the subject is on fuel pressure (carbureted engine) I thought I’d relate a little problem I am encountering on occasion in my fuel injected engine.

I’d be putting along at cruise speed when all of a sudden, some slight misfire, loss of poser. I look at the fuel pressure and it is down from 26 psi to the low teens. A slight touch of the boost pump and the problem disappears. Turn the boost pump off and the pressure continues up there at 27 psi and I can continue and hour or more – no incident.

Set up :  TMX-360 (AKA IO-360), Precision Airmotive Silver Hawk Fuel injection, standard injectors. Pmag and Slick. I run at 24/2400 8 USG/hr and get 150 knts ias.

Temporary vapor lock ? Mechanical fuel pump is beginning to have problems ? It’s a glitch – it does not happen on all flights and does not seem related to outside air temp. Any ideas ???

This does not keep me from flying but since the boost pump has become a life line, I am installing Andair’s new fuel pump in line with the boost pump as a back up boost pump in case things get a little nasty.

Regards,
Michèle
RV8 – TMX-360

[quote][b]

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flying-nut(at)cfl.rr.com
Guest
PostPosted: Fri Jun 28, 2013 11:20 am    Post subject: Low fuel pressure injected engine Reply with quote
On 6/28/2013 2:56 PM, Michele Delsol wrote:

Quote:
<![endif]--> <![endif]-->
Hello to all,

While the subject is on fuel pressure (carbureted engine) I thought I’d relate a little problem I am encountering on occasion in my fuel injected engine.

I’d be putting along at cruise speed when all of a sudden, some slight misfire, loss of poser. I look at the fuel pressure and it is down from 26 psi to the low teens. A slight touch of the boost pump and the problem disappears. Turn the boost pump off and the pressure continues up there at 27 psi and I can continue and hour or more – no incident.

Set up : TMX-360 (AKA IO-360), Precision Airmotive Silver Hawk Fuel injection, standard injectors. Pmag and Slick. I run at 24/2400 8 USG/hr and get 150 knts ias.

Temporary vapor lock ?
Unlikely in cruise.
Quote:

Mechanical fuel pump is beginning to have problems ?
That's possible. There could be something that gets caught in the pump valve(s) that's put back in it's 'resting place' when you turn the electric pump on. Just speculation ......
Quote:

It’s a glitch – it does not happen on all flights and does not seem related to outside air temp. Any ideas ???
You might try changes in throttle or mixture to see it that changes anything before using the electric pump. Let us know what you find.
Linn
[quote]


This does not keep me from flying but since the boost pump has become a life line, I am installing Andair’s new fuel pump in line with the boost pump as a back up boost pump in case things get a little nasty.

Regards,
Michèle
RV8 – TMX-360

Quote:


No virus found in this message.
Checked by AVG - www.avg.com
06/28/13 [b]

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rwstracy(at)gmail.com
Guest
PostPosted: Fri Jun 28, 2013 11:35 am    Post subject: Low fuel pressure injected engine Reply with quote
That is a mystery. But if the problem gets even slightly worse ( with old & new boost pumps off) the likelihood of vapor lock as the problem is pretty high. Any increase in flow resistance at that point in the system will make matters worse.
FWIW, many aircraft fuel systems are an excuse for vapor lock to happen. It's no wonder using auto fuel pushes them over the edge.
Tracy Crook
2000+ hours on auto fuel without vapor lock.

Sent from my iPad

On Jun 28, 2013, at 12:56, "Michele Delsol" <mdelsol(at)md-dsl.fr (mdelsol(at)md-dsl.fr)> wrote:
[quote] <![endif]--> <![endif]-->
Hello to all,

While the subject is on fuel pressure (carbureted engine) I thought I’d relate a little problem I am encountering on occasion in my fuel injected engine.

I’d be putting along at cruise speed when all of a sudden, some slight misfire, loss of poser. I look at the fuel pressure and it is down from 26 psi to the low teens. A slight touch of the boost pump and the problem disappears. Turn the boost pump off and the pressure continues up there at 27 psi and I can continue and hour or more – no incident.

Set up : TMX-360 (AKA IO-360), Precision Airmotive Silver Hawk Fuel injection, standard injectors. Pmag and Slick. I run at 24/2400 8 USG/hr and get 150 knts ias.

Temporary vapor lock ? Mechanical fuel pump is beginning to have problems ? It’s a glitch – it does not happen on all flights and does not seem related to outside air temp. Any ideas ???

This does not keep me from flying but since the boost pump has become a life line, I am installing Andair’s new fuel pump in line with the boost pump as a back up boost pump in case things get a little nasty.

Regards,
Michèle
RV8 – TMX-360

Quote:


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robin(at)PaintTheWeb.com
Guest
PostPosted: Fri Jun 28, 2013 9:27 pm    Post subject: Low fuel pressure injected engine Reply with quote
Michèle
Do you know your TAS at those settings?

Robin

From: owner-rv-list-server(at)matronics.com [mailto:owner-rv-list-server(at)matronics.com] On Behalf Of Michele Delsol
Sent: Friday, June 28, 2013 11:57 AM
To: rv-list(at)matronics.com
Subject: Low fuel pressure injected engine



Hello to all,

While the subject is on fuel pressure (carbureted engine) I thought I’d relate a little problem I am encountering on occasion in my fuel injected engine.

I’d be putting along at cruise speed when all of a sudden, some slight misfire, loss of poser. I look at the fuel pressure and it is down from 26 psi to the low teens. A slight touch of the boost pump and the problem disappears. Turn the boost pump off and the pressure continues up there at 27 psi and I can continue and hour or more – no incident.

Set up : TMX-360 (AKA IO-360), Precision Airmotive Silver Hawk Fuel injection, standard injectors. Pmag and Slick. I run at 24/2400 8 USG/hr and get 150 knts ias.

Temporary vapor lock ? Mechanical fuel pump is beginning to have problems ? It’s a glitch – it does not happen on all flights and does not seem related to outside air temp. Any ideas ???

This does not keep me from flying but since the boost pump has become a life line, I am installing Andair’s new fuel pump in line with the boost pump as a back up boost pump in case things get a little nasty.

Regards,
Michèle
RV8 – TMX-360
Quote:
====================[/b][/quote] bsp; - The RV-List Email Forum -[/b][/quote] o browse[/b][/quote] scription,[/b][/quote] , Chat, FAQ,[/b][/quote] /span>[/b][/quote] tronics.com/Navigator?RV-List">http://www.matronics.com/Navigator?RV-List[/b][/quote] ====================[/b][/quote] bsp; - MATRONICS WEB FORUMS -[/b][/quote] eb Forums![/b][/quote] .matronics.com">http://forums.matronics.com[/b][/quote] ====================[/b][/quote] bsp; - List Contribution Web Site -[/b][/quote] o:p>[/b][/quote] bsp;   -Matt Dralle, List Admin.[/b][/quote] tronics.com/contribution">http://www.matronics.com/contribution[/b][/quote] ====================[/b] [/quote]

No virus found in this message.
Checked by AVG - www.avg.com
:p>
[quote][b]

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Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

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mdelsol(at)md-dsl.fr
Guest
PostPosted: Sat Jun 29, 2013 12:06 pm    Post subject: Low fuel pressure injected engine Reply with quote
Not exactly – should be around 155 at 2500’ – should have 160+ 22/2400 at 6500’ – 8 US gal/hr. I have forward induction with the snorkel. A James cowl with direct forward air feed should get me some more MP and less air intake hence more power at altitude and less drag, but that is just conjecturing. And another thread.

On the fuel pressure issue – two flights today – problem did not manifest itself – a mystery. Outside air temp around 60°F. Flew between 400’ and 7500’.

Michèle


De : owner-rv-list-server(at)matronics.com [mailto:owner-rv-list-server(at)matronics.com] De la part de Robin Marks
Envoyé : samedi 29 juin 2013 07:26
À : rv-list(at)matronics.com
Objet : RE: Low fuel pressure injected engine

Michèle
Do you know your TAS at those settings?

Robin

From: owner-rv-list-server(at)matronics.com (owner-rv-list-server(at)matronics.com) [mailto:owner-rv-list-server(at)matronics.com (owner-rv-list-server(at)matronics.com)] On Behalf Of Michele Delsol
Sent: Friday, June 28, 2013 11:57 AM
To: rv-list(at)matronics.com (rv-list(at)matronics.com)
Subject: Low fuel pressure injected engine

Hello to all,

While the subject is on fuel pressure (carbureted engine) I thought I’d relate a little problem I am encountering on occasion in my fuel injected engine.

I’d be putting along at cruise speed when all of a sudden, some slight misfire, loss of poser. I look at the fuel pressure and it is down from 26 psi to the low teens. A slight touch of the boost pump and the problem disappears. Turn the boost pump off and the pressure continues up there at 27 psi and I can continue and hour or more – no incident.

Set up : TMX-360 (AKA IO-360), Precision Airmotive Silver Hawk Fuel injection, standard injectors. Pmag and Slick. I run at 24/2400 8 USG/hr and get 150 knts ias.

Temporary vapor lock ? Mechanical fuel pump is beginning to have problems ? It’s a glitch – it does not happen on all flights and does not seem related to outside air temp. Any ideas ???

This does not keep me from flying but since the boost pump has become a life line, I am installing Andair’s new fuel pump in line with the boost pump as a back up boost pump in case things get a little nasty.

Regards,
Michèle
RV8 – TMX-360
Quote:

====================
bsp; - The RV-List Email Forum -
o browse
scription,
, Chat, FAQ,
/span>
tronics.com/Navigator?RV-List">http://www.matronics.com/Navigator?RV-List
====================
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eb Forums!
.matronics.com">http://forums.matronics.com
====================
bsp; - List Contribution Web Site -
o:p>
bsp;   -Matt Dralle, List Admin.
tronics.com/contribution">http://www.matronics.com/contribution
====================
Quote:


No virus found in this message.
Checked by AVG - www.avg.com
:p>
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robin(at)PaintTheWeb.com
Guest
PostPosted: Sat Jun 29, 2013 5:19 pm    Post subject: Low fuel pressure injected engine Reply with quote
I have the exact same thing happen to me (IO-360 200 Hp, James Cowl, Bendex, Mag/Pmag)
I fly 21.5/2250 LOP at 6.2-6.8 GPH ~158 TAS. My cylinder & oil temps are quite low because there is so little pressure & minimal internal stress vs. 24 or 25 Squared ROP. It sort of feels like my system is gently falling asleep and then the fuel pump takes a nap. Sometimes I hit the boost pump and sometimes I let it drop and then catch back up with rarely a stumble. I do occasionally have a stumble but I thing that is more related to my most lean cylinder (LOP) getting too lean vs. system fuel starvation.

Good luck,
Robin

From: owner-rv-list-server(at)matronics.com [mailto:owner-rv-list-server(at)matronics.com] On Behalf Of Michele Delsol
Sent: Saturday, June 29, 2013 1:07 PM
To: rv-list(at)matronics.com
Subject: RE: Low fuel pressure injected engine



Not exactly – should be around 155 at 2500’ – should have 160+ 22/2400 at 6500’ – 8 US gal/hr. I have forward induction with the snorkel. A James cowl with direct forward air feed should get me some more MP and less air intake hence more power at altitude and less drag, but that is just conjecturing. And another thread.

On the fuel pressure issue – two flights today – problem did not manifest itself – a mystery. Outside air temp around 60°F. Flew between 400’ and 7500’.

Michèle

 
De : owner-rv-list-server(at)matronics.com (owner-rv-list-server(at)matronics.com) [mailto:owner-rv-list-server(at)matronics.com (owner-rv-list-server(at)matronics.com)] De la part de Robin Marks
Envoyé : samedi 29 juin 2013 07:26
À : rv-list(at)matronics.com (rv-list(at)matronics.com)
Objet : RE: Low fuel pressure injected engine



Michèle
Do you know your TAS at those settings?

Robin

From: owner-rv-list-server(at)matronics.com (owner-rv-list-server(at)matronics.com) [mailto:owner-rv-list-server(at)matronics.com (owner-rv-list-server(at)matronics.com)] On Behalf Of Michele Delsol
Sent: Friday, June 28, 2013 11:57 AM
To: rv-list(at)matronics.com (rv-list(at)matronics.com)
Subject: Low fuel pressure injected engine



Hello to all,

While the subject is on fuel pressure (carbureted engine) I thought I’d relate a little problem I am encountering on occasion in my fuel injected engine.

I’d be putting along at cruise speed when all of a sudden, some slight misfire, loss of poser. I look at the fuel pressure and it is down from 26 psi to the low teens. A slight touch of the boost pump and the problem disappears. Turn the boost pump off and the pressure continues up there at 27 psi and I can continue and hour or more – no incident.

Set up : TMX-360 (AKA IO-360), Precision Airmotive Silver Hawk Fuel injection, standard injectors. Pmag and Slick. I run at 24/2400 8 USG/hr and get 150 knts ias.

Temporary vapor lock ? Mechanical fuel pump is beginning to have problems ? It’s a glitch – it does not happen on all flights and does not seem related to outside air temp. Any ideas ???

This does not keep me from flying but since the boost pump has become a life line, I am installing Andair’s new fuel pump in line with the boost pump as a back up boost pump in case things get a little nasty.

Regards,
Michèle
RV8 – TMX-360
Quote:

====================
bsp; - The RV-List Email Forum -
o browse
scription,
, Chat, FAQ,
/span>
tronics.com/Navigator?RV-List">http://www.matronics.com/Navigator?RV-List
====================
bsp;   - MATRONICS WEB FORUMS -
eb Forums!
.matronics.com">http://forums.matronics.com
====================
bsp; - List Contribution Web Site -
o:p>
bsp;     -Matt Dralle, List Admin.
tronics.com/contribution">http://www.matronics.com/contribution
====================
Quote:


No virus found in this message.
Checked by AVG - www.avg.com
:p>
Quote:
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No virus found in this message.
Checked by AVG - www.avg.com
:p>
[quote][b]

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