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 Posted: Sun Oct 26, 2014 4:58 am Post subject: Wiring RV7 with Z13 diagram (2 alternators, 1 battery) |
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I don't have an EFII, but I am working with an automotive injection system. I'd 2d Justin's comments, and add that unless you plumb in a check valve that can bypass the dual EFII pumps, it is quite likely that the mechanical pump will be unable to pump fuel with both electric pumps off or dead. All the 'inline' style automotive injection pumps I've been able to find are positive displacement pumps. They won't pass fuel unless the pump mechanism is actually turning. See the EFII 'boost' pump for comparison; the skinny cylinder next to the actual pump contains a check valve to pass fuel sucked by the mechanical pump in a traditional Bendix style injection system.
I'd also ask about the operating pressure of the EFII system. Virtually all current automotive systems operate in the 40-60 psi range; a standard Lyc pump achieves barely half that. If he's using standard automotive injectors, the engine would likely go so lean on just the mechanical pump that it would quit.
We could be wrong, but if either or both of us are right, you could have serious problems.
Charlie
On Sat, Oct 25, 2014 at 7:44 PM, Justin Jones <jmjones2000(at)mindspring.com (jmjones2000(at)mindspring.com)> wrote:
[quote]--> AeroElectric-List message posted by: Justin Jones <jmjones2000(at)mindspring.com (jmjones2000(at)mindspring.com)>
I also have the EFII system with redundant ecus.
Make sure you talk with Robert about the mechanical fuel pump in the EFII system. The issue I see with placing a mechanical fuel pump in the system would be pressurizing it with an electric fuel pump. The head pressure put out by the EFII pump module can damage the mechanical pump diaphragms. If one or both diaphragms begin to leak, you will loose fuel pressure to your injectors and they will fail to inject fuel into the cylinders, resulting in engine failure.
If you MUST have the mechanical pump in the system, I would suggest that the fuel from the tanks run thru the mechanical fuel pump first, then thru the EFII electrical fuel pump module. More plumbing but much safer. I'm sure Robert Paisley will have an opinion as well.
Hope this helps
Justin
> On Oct 23, 2014, at 07:54, carrollcw <carrollswa(at)gmail.com (carrollswa(at)gmail.com)> wrote:
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> --> AeroElectric-List message posted by: "carrollcw" <carrollswa(at)gmail.com (carrollswa(at)gmail.com)>
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> For now, I just want to get it in the air for day/vfr/acro only. However, I will later make it fully night IFR.
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> I am running the dual EFII ignition and fuel injection. Although I will have a mechanical pump, at least one electric pump must be running to sepply sufficient pressure.
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> EI does not have its own power backup. After speaking with Robert at EFII, I am planning on wiring the 2 ECU's, 2 Ignitions, and 2 Fuel pumps to the always hot battery bus with switches for each of them, although I was planning on wiring the fuel pumps with a single dual pole switch.
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> Basic architecture staying the same. Breakers for e-bus, fuses for everything else.
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> Thanks for the help!
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> Read this topic online here:
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> http://forums.matronics.com/viewtopic.php?p=432174#432174
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