TESTED: Stock FPR capabilities
Apr 23, 2012, 04:43 AM
#16
My stock regulator failed after a little less than a year of be subjected to constant fuel pressure spikes from the double pumper.
When the hobbs switch kicked in I would get an immediate rich AFR swing.
I have since replaced my factory regulator with an Aeromotive unit and all is good now.
When the hobbs switch kicked in I would get an immediate rich AFR swing.
I have since replaced my factory regulator with an Aeromotive unit and all is good now.
Interesting test. The one piece missing is that there is a lot more fuel flowing through the injectors at 10 psi than there is at idle. This will significantly reduce the load on the fpr. You would not necessarily see 74 psi as the lowest fuel pressure. As flow through the injectors increases, you'd likely see a drop in fuel pressure.
-Jamie
Apr 19, 2016, 10:27 AM
#17
Evolved Member
Interesting test. The one piece missing is that there is a lot more fuel flowing through the injectors at 10 psi than there is at idle. This will significantly reduce the load on the fpr. You would not necessarily see 74 psi as the lowest fuel pressure. As flow through the injectors increases, you'd likely see a drop in fuel pressure.
My second pump kicks in at 15 lbs of boost and I have no issues with fuel pressure.
the extra flow through the injectors is what this test is lacking and proves nothing without that part of the equation.
Jun 6, 2016, 11:40 AM
#23
EvoM Guru
iTrader: (1)
Mine is drilled to 9/64's, works great. The part you drill is on the housing in the tank. Its a little y looking thing.
In picture #2, the guy is holding it. You run the bit through the part that says "DENSO" on it.
https://www.evolutionm.net/forums/ev...evo-8-9-a.html
In picture #2, the guy is holding it. You run the bit through the part that says "DENSO" on it.
https://www.evolutionm.net/forums/ev...evo-8-9-a.html
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Kevin Troy (Jun 7, 2016)
Jun 7, 2016, 10:31 AM
#24
Evolving Member
I still dont understand what purpose dose it do by drilling a hole? how much is 9/64? like 3,5mm?
is this where to drill?
upload photos
is this where to drill?
upload photos
Last edited by Kevin Troy; Jun 7, 2016 at 10:38 AM.
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Kevin Troy (Jun 7, 2016)
Jun 7, 2016, 12:30 PM
#27
EvoM Guru
iTrader: (1)
Originally Posted by Kevin Troy
OK, let me get this straight, when hardwired aeromotive 340lph intank pump and aftermarket FPR I should drill there a hole for better fuel return ?
You remove it, then drill it through tube sticking out from either side, like so, enlarging the existing hole on the inside.
There is a hole in there that is small. Fuel coming through the return line hits it, creating a siphon and pulling fuel over from the other side of the tank. When using a higher flow pump, you need to enlarge that hole.
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Kevin Troy (Jun 7, 2016)
Jun 7, 2016, 02:29 PM
#29
Hardwiring a high flow pump for full-time full voltage can still lead to fuel pressure control issues even if the siphon is drilled out. I have a thread that shows how to do a simple rewire that maintains the the factory low/full voltage capability but still provides for better voltage when needed.
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Kevin Troy (Jun 8, 2016)
Jun 7, 2016, 02:52 PM
#30
EvoM Guru
iTrader: (1)
Hardwiring a high flow pump for full-time full voltage can still lead to fuel pressure control issues even if the siphon is drilled out. I have a thread that shows how to do a simple rewire that maintains the the factory low/full voltage capability but still provides for better voltage when needed.
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Kevin Troy (Jun 8, 2016)
