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  #11  
Old 08-01-2017, 10:12 AM
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Bluelabel Bluelabel is offline
 
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Quote:
Originally Posted by bret View Post
Mine does this also, just switch tanks real fast, you are closing and then opening the ports during this movement and our fuel system requires constant fuel pressure to the injectors.
Bret,
Does your do it randomly?
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  #12  
Old 08-01-2017, 10:25 AM
rv7charlie rv7charlie is offline
 
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28psi with electronic injection? Is that what Ross recommends? Typical for auto style inj is 42-60psi.
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  #13  
Old 08-01-2017, 10:37 AM
rocketman1988 rocketman1988 is offline
 
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Default pressure

I thought I read that the fuel pressure was to be set at 35 psi. Not flying yet but I think I have the same system...
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  #14  
Old 08-01-2017, 10:40 AM
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Bluelabel Bluelabel is offline
 
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Quote:
Originally Posted by rv7charlie View Post
28psi with electronic injection? Is that what Ross recommends? Typical for auto style inj is 42-60psi.
It's not Ross's system thank god. This is the PSI that Robert at EFII recommends.(I'm running slightly above actually) And with over 400 planes flying, I'll trust that setting. But that's not the point of this thread.

as I said, it's super inconsistent. In 150 hours of flight it's maybe happened 8 times, but it's still no fun.
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John Walker
RV-10 N265WD
"Miss Whiskey Delta"
BPE IO-540, FULL EFII
KMYF, San Diego, Ca.
KEOS, Neosho, MO

Crew Lead on the
Grove Aero Super Legacy Reno Racer,
twin turbo, IO-540,
full EFII management system
!

"so I got that going for me... which is nice."
2017 Dues Paid"
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  #15  
Old 08-01-2017, 10:42 AM
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Bluelabel Bluelabel is offline
 
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Quote:
Originally Posted by rocketman1988 View Post
I thought I read that the fuel pressure was to be set at 35 psi. Not flying yet but I think I have the same system...
35 static... once flying, MAP will change the pressure.
I may bump it up a bit and see if it changes, or just run both pumps when switching.
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John Walker
RV-10 N265WD
"Miss Whiskey Delta"
BPE IO-540, FULL EFII
KMYF, San Diego, Ca.
KEOS, Neosho, MO

Crew Lead on the
Grove Aero Super Legacy Reno Racer,
twin turbo, IO-540,
full EFII management system
!

"so I got that going for me... which is nice."
2017 Dues Paid"
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  #16  
Old 08-01-2017, 12:22 PM
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Carl Froehlich Carl Froehlich is offline
 
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If you electric fuel pump is on all the time, that leaves only an air leak (or fuel leak depending on how you look at it) or some issue with the added complexity of the duplex fuel selector valve.

Look for some blue stains.

Carl
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  #17  
Old 08-01-2017, 12:30 PM
BobTurner BobTurner is offline
 
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Location: Livermore, CA
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With a fuel flow of 40 gal/hr I think this is unavoidable, unless you can get a "make before break" valve (e.g. Going from left to right there is always fuel flowing).
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  #18  
Old 08-01-2017, 12:50 PM
TS Flightlines TS Flightlines is offline
 
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If I may---think about this--you're running on tank 1. Tank 2 doesnt necessarily have fuel all the way to the selector valve. (hopefully it does) So when you switch tanks, the pump has to pull full from tank 2 through the lines, through the valve, through the pre filter, to the pump, then under pressure of 40+- psi ( or whatever its set at) to the outlet hoses, to the injector rails and then the injectors. Even with GREAT suction of the pump, there 'may' be a slight lag in fuel delivery. Like filling up your garden hose with 35 psi of water pressure.

There 'may' be a situation where vacuum in the tank(s) are drawing fuel back from the selector valve to the tanks, creating this dead space that has to be filled.

Tom
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  #19  
Old 08-01-2017, 05:11 PM
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M McGraw M McGraw is offline
 
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Location: Greenback, TN
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Default Fuel pressure

John,
I believe you are running your fuel pressure too low. I run my system at 50PSI for an IO-390. The standard pressure from Ross SDSEFI is 40PSI. I understand that you are using EFii, but physics is physics and automotive injectors typically need more pressure. Your static pressure and inflight pressure should be the same. Do you have your fuel pressure regulator hooked up to your Manifold Pressure?
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  #20  
Old 08-01-2017, 05:13 PM
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M McGraw M McGraw is offline
 
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Default Pressure

Quote:
Originally Posted by Bluelabel View Post
35 static... once flying, MAP will change the pressure.
I may bump it up a bit and see if it changes, or just run both pumps when switching.
Hello John,
Your fuel pressure static and in flight should be constant.
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