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Thread: Kyosan Fuel Pump - Independent Bench Flow Numbers and Pictures

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    Kyosan Fuel Pump - Independent Bench Flow Numbers and Pictures

    So first let me begin by thanking Brett Plow and Aeromotive for being extremely kind and helpful in this venture. They kindly did me a favor by bench testing the Kyosan/Denso Fuel Pump because of a connection to a local engine builder. (ie please dont go asking them to benchflow your pump, this was a one time favor!)

    So I bought a Kyosan/Denso Fuel Pump from the ebay seller found here:
    Ebay Kyosan/Denso Pump

    this is the exact same seller and pump that is found at:
    Denso Fuel Pump - 300LPH 1020 Toyota Supra Denso Fuel Pumps

    Notice the email address is the same.

    Pictures of the Pump are Here:








    Comparison to Stock Unit:





    So I had Aeromotive bench test the fuel pump once it arrived to see if it lived up to its vaulted claims. Sadly it did not. This pump is basically the factory Denso fuel pump for the Supra TT. Since I dont have a scanner I put their numbers in an excel spreadsheet. Their measurements were done in gallons per minute, I converted to liters per hour by multiplying by 227.12. The graph attached is the Kyosan pump and the Factory Denso pump (information taken from Stealth316.com). I also attached the excel spread sheet with Aeromotive's numbers. As can be seen the pumps are virtually identical.

    Note: The Kyosan pump was tested at a voltage of 13.5V. The denso information from Stealth316.com is tested at 14V.

    Note: Aeromotive used mineral spirits as a testing fluid ... which has a specific gravity between 0.74 -0.79 depending on where you look, this is likely the same testing fluid that was used on the supra pump as Jeff Lucius claims the supra pump was tested with a fluid with a specific gravity of 0.79. Thus the two bench tests are valid for direct comparison.

    BLUE is the Kyosan Fuel Pump
    RED is the Factory Denso Supra TT pump (info from Stealth316)



    Here is a Graph showing the numbers claimed at the vendors website and ebay ad , versus what independent testing shows.


    Here are the Claimed Flow Rates:
    510 LPH @ 10 PSI @ 14 Volts 7.7 Amps
    470 LPH @ 20 PSI @ 14 Volts 8.3 Amps
    430 LPH @ 30 PSI @ 14 Volts 8.9 Amps
    390 LPH @ 40 PSI @ 14 Volts 9.5 Amps
    350 LPH @ 50 PSI @ 14 Volts 10.5 Amps
    305 LPH @ 60 PSI @ 14 Volts 11.5 Amps
    258 LPH @ 70 PSI @ 14 Volts 12.5 Amps
    200 LPH @ 80 PSI @ 14 Volts 13.5 Amps
    140 LPH @ 90 PSI @ 14 Volts 14.2 Amps
    320 LPH @ 30 PSI @ 12 Volts 7.3 Amps
    273 LPH @ 40 PSI @ 12 Volts 8.3 Amps
    225 LPH @ 50 PSI @ 12 Volts 9.3 Amps
    180 LPH @ 60 PSI @ 12 Volts 10.4 Amps
    120 LPH @ 40 PSI @ 9 Volts 7.1 Amps
    Attached Files Attached Files
    Last edited by Fakepower; 12-18-2010 at 09:16 PM.

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    Forum User Not Verified Feedback Score 2 (100%) RealMcCoy's Avatar
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    I could have told you the claims were BS just by the claimed amp draw... There's no way that thing is only drawing 14 amps at 90 psi.

    Great info. Thanks for making it happen and posting.


    Real Performance Automotive (541)816-4500 www.FB.com/RealPerformanceAuto

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    One day....it will be on 4 wheels. supporter Feedback Score 2 (100%)
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    Good info man...lots of shit has been floating around about how good this is..

    so whats the current leader in intank near stock replacement pump then?
    Building a House, Car Mods on hold!
    1996 GTO, Owner since 2003.

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    Banned Feedback Score 11 (100%) J. Fast's Avatar
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    Can I get a summation of the results since the shared links are blocked?
    Last edited by J. Fast; 12-19-2010 at 10:45 AM.

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    Banned Feedback Score 11 (100%) J. Fast's Avatar
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    A few DSM guys are also coming out and saying the kyosian's have problems with E-85 in a couple of years time. It's only coming out now since they first surfaced in 2008 so be careful when weighing that option if using anything other than petro.

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    Pictures .... part1
    Attached Images Attached Images

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    pics part 2
    Attached Images Attached Images
    Last edited by Fakepower; 12-18-2010 at 09:17 PM.

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    Alright So I finished updating everything, its the same info as 3si, however all the pictures, graphs and spreadsheets are now uploaded to 3sgto so everything should work . please let me know if something is still linked to the other site.

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    Did you only test one? What was the voltage vs. LPH above 13.5 V? 14.0, 14.5, 15.5, 16? Does it run hotter or colder than the Denso?
    Last edited by J. Fast; 12-19-2010 at 10:51 AM.

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    Quote Originally Posted by J. Fast View Post
    Did you only test one? What was the voltage vs. LPH above 13.5 V? 14.0, 14.5, 15.5, 16? Does it run hotter or colder than the Denso?
    The voltage is listed in the information in the first post. Hotter or colder? .... temperature? ....

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