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Thread: Rare fuel pump? Kyosan 0810 390lph @14v+43psi

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    SDSU Alumnus verified Feedback Score 4 (100%) bboyalan's Avatar
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    Rare fuel pump? Kyosan 0810 390lph @14v+43psi

    A local member and I pulled his fuel pump assembly to swap in a Walbro 341 on Friday afternoon. We were expecting to see a factory Denso, but this showed up instead:


    It was zip-tied to the assembly and was formerly a Denso with first section of the part number scratched off.


    Close up view.

    For comparison, here is a stock Denso versus Denso Supra that I had three weeks ago:


    If my research was correct, a Denso "-0872" is a re-worked pump by Kyosan that flows substantial numbers if adequately powered.

    The Silvia guys had one flow-tested for 300LPH @13V+40psi.
    Ripped Off By NissanSilvia Sponsor? <<

    The Supra guys had a few words:
    Fuel pump upgrade question (not fitment) <<

    Lastly, Corvette Forum:
    NEW, The Best in tank fuel pump, denso kyosan 390lph @ 40psi <<

    Do we truly have our hands on a sweet ass pump that outflows the Supra?

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    Yes, it sure looks like it. Great pumps, and relatively inexpensive. Or in that case, free
    R135
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    I just ordered one to replace my walbro

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    SDSU Alumnus verified Feedback Score 4 (100%) bboyalan's Avatar
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    Haha well shit, we should have left that damn thing installed. I wanted to play it safe and hot-wired the Walbro for our tuning session. I wonder how much this thing is worth....

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    did the kyosan have any kind of whine? i'm guessing not since you thought it had a stock pump.

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    Forum User verified Feedback Score 0 HLxDrummer's Avatar
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    Very interesting. Does it go in like stock or does it look like it required modification?

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    One day....it will be on 4 wheels. supporter Feedback Score 2 (100%)
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    Why? Because Race Car. verified Feedback Score 0 akotten's Avatar
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    kind of like when I found out I had the HKS Cosmo pump
    91 R/T TT
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    I just bought a kyosan pump recently but it has no numbers on the pump itself and its supposed to outflow the supra pump. I was meaning to have it flow tested but never bothered. My in-tank assembly was in crappy shape so I bought a whole new assembly and installed it before the pump arrived. I was going to put it in but I never ran out of fuel with the supra denso before it started intermittantly stalling out and finally failed altogether.

    Sam

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    Quote Originally Posted by DocWalt View Post
    Yes, it sure looks like it. Great pumps, and relatively inexpensive. Or in that case, free
    Speaking of which, I might be keeping this pump for my [hopefully] future VR-4. It seems so unique.

    Quote Originally Posted by spfan View Post
    did the kyosan have any kind of whine? i'm guessing not since you thought it had a stock pump.
    It supposedly ran as quiet as stock did. This could be subjective though. I wonder how it sounds with a BAP.

    Quote Originally Posted by HLxDrummer View Post
    Very interesting. Does it go in like stock or does it look like it required modification?
    That is what threw us off for a few minutes. It was installed exactly like stock, minus the zip-ties. I seriously thought it was a factory VR-4 pump until those other threads popped up.

    Sam - If I understood you correctly, you stayed with the Supra instead? I know that Matt has been successfully using the Denso Supra/BAP combination on a few cars. Should I be concerned if this pump is underperforming and have it flow-tested?

    This really makes you think twice about going with Walbro for the price, drop-in replacement, and noise.

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