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#1
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adding ethanol content sensor
I'm adding an ethanol content sensor to be able to run E85 as an option, the Continental model specifically. Only major hurdle is that it's lines are 3/8" tubing, factory efi style. Fittings are available to adapt it to A/N lines, so that's no issue. The issue is in trying not to create a restriction. The rest of my supply/return lines are -8, as recommended by the pumps manufacturer. I currently use these -8 lines single in/out, Y'd at the rails to a single port on a 2 port return style regulator. I have no fuel delivery issues currently. My thinking is, if I add a "T" in the current single line to the regulator, pass that fuel through the sensor and into the currently unused port on the regulator, that I can avoid creating a restriction. Essentially I'm passing the same volume of fuel, now through two pathways. I've attached a crude drawing for illustrative purposes. The purple is what would be added everything else, is existing. Red depicts the return side of the rails currently. Any thoughts, or suggestions appreciated.
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'65 Tempest 467 3650# 11.30@120.31 |
#2
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By-pass reading of the ethanol content is perfectly acceptable and recommended.
Tom V.
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"Engineers do stuff for reasons" Tom Vaught Despite small distractions, there are those who will go Forward, Learning, Sharing Knowledge, Doing what they can to help others move forward. |
#3
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Thanks Tom. Do you think the method I depicted will avoid creating a restriction?
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'65 Tempest 467 3650# 11.30@120.31 |
#4
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Yes, you will be fine, your concept will allow the fuel sensor "leg" to pass enough fuel (thru the sensor) to not restrict normal flow and the normal fuel system system "leg" will allow the NORMAL fuel flow the engine needs if it is properly sized.
What ever the inlet to the sensor is, go up one size on the fuel line flow size for that leg. Tom V.
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"Engineers do stuff for reasons" Tom Vaught Despite small distractions, there are those who will go Forward, Learning, Sharing Knowledge, Doing what they can to help others move forward. |
#5
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The sensor is 3/8, it will be fed through a -8 line.
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'65 Tempest 467 3650# 11.30@120.31 |
#6
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Looking at them concept from a pressure differential point of view, it will pass the fuel that it can and the other leg will pass as much fuel as it can. There is really no "robbing of the fuel" to the engine like a return line before the carb (for example) would be.
You should be just fine. Tom V.
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"Engineers do stuff for reasons" Tom Vaught Despite small distractions, there are those who will go Forward, Learning, Sharing Knowledge, Doing what they can to help others move forward. |
#7
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Scott you can also run content sensors on the pressure side also. I run mine there because my return is already inside the fuel tank.
Also as Tom said, you'll be fine on the return size.
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'71 Holden HQ Monaro - 3850lbs race weight, 400c/i - 11.4 @ 120 '66 Pontiac GTO - 389, 4 speed street cruiser |
#8
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I chose the return side because Magnafuel is fairly adamant about not restricting the pump, and using -8 fuel lines for the protuner pumps. I know that 3/8 is smaller than recommended. I figured on the return, I should be ok adding a second leg. The regulator should keep both legs pressurized, and I know that one -8 main return line is working. So... this was the method that seemed to satisfy all requirements in my mind. I probably won't add it til winter, as I really need to replace all my lines, especially before actually using E85. Makes sense to do it all at once. Thanks for the input all.
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'65 Tempest 467 3650# 11.30@120.31 |
#9
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This is what I plan on running. Many guys on Drag Week use it.
https://www.ebay.com/itm/Flex-Fuel-S...72.m2749.l2649
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65 Lemans Street Car - 521, T400, 3.70 9". 10.13 @ 135. 3770 lbs. Drag Week ‘14, ‘15, ‘17 63 Lemans Race Car- 8.81 @ 151, 5.60 @ 123(SOLD) 67 Bonneville ragtop 74 Firebird - 455, e heads, TK0600 in process |
#10
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I'll have to look into that and see if it will fit my sensor. Might make plumbing easier.
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'65 Tempest 467 3650# 11.30@120.31 |
#11
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You should be testing the C2H5OH prior to putting it in your tank.
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#12
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It's purpose isn't for testing. It's for the ecu to adjust fueling, whatever the content.
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'65 Tempest 467 3650# 11.30@120.31 |
#13
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Quote:
Tom V.
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"Engineers do stuff for reasons" Tom Vaught Despite small distractions, there are those who will go Forward, Learning, Sharing Knowledge, Doing what they can to help others move forward. |
#14
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This set up takes the factory GM type sensor. I think Continental is the brand. I have already purchased this set up, but not the sensor yet.
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65 Lemans Street Car - 521, T400, 3.70 9". 10.13 @ 135. 3770 lbs. Drag Week ‘14, ‘15, ‘17 63 Lemans Race Car- 8.81 @ 151, 5.60 @ 123(SOLD) 67 Bonneville ragtop 74 Firebird - 455, e heads, TK0600 in process |
#15
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I have the sensor, but no plumbing... between the two of us we could make it...
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'65 Tempest 467 3650# 11.30@120.31 |
#16
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GM Flex Fuel sensor & Russell tube adapter fittings
Here is a picture of a Holley EFI regulator with the attached GM flex fuel sensor.
We used the Russell 644133 tube to AN adapters, worked great. We added a -8 AN gauge port adapter on the return line temporarily with a gauge (0-20 psi) to see if we had any type of residual back pressure, there was none. |
#17
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Good to know. What pump was this measured with?
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'65 Tempest 467 3650# 11.30@120.31 |
#18
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A large Magnafuel external mount pump, 750 series.
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#19
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Good to know. I guess it wouldn't choke my 525... Thanks for the info!
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'65 Tempest 467 3650# 11.30@120.31 |
#20
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I’m using the Motion Raceworks billet dual feed kit. Very nice piece. It can be used on the supply line or return line without restriction. I have mine on a -8 ptfe return. Makes for an easy install.
https://www.motionraceworks.com/prod...n-6an-8an-10an
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James 1970 Trans Am Spotts Built 484" IA2, Highports, EFI Northwind Holley Terminator X sequential EFI fabrication and suspension by https://www.funkhouserracecars.com/ |
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