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:

http://img.photobucket.com/albums/v2...4/515a10f2.jpg
It was zip-tied to the assembly and was formerly a Denso with first section of the part number scratched off.

http://img.photobucket.com/albums/v2...4/d8d44da2.jpg
Close up view.

For comparison, here is a stock Denso versus Denso Supra that I had three weeks ago:
http://img.photobucket.com/albums/v2...0/b130c146.jpg

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? :D

Regards,
~ALan

Yes, it sure looks like it. Great pumps, and relatively inexpensive. Or in that case, free :p

I just ordered one to replace my walbro

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....

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

Very interesting. Does it go in like stock or does it look like it required modification?

http://www.densofuelpump.com/

kind of like when I found out I had the HKS Cosmo pump :D

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

Quote:

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Originally Posted by DocWalt

Yes, it sure looks like it. Great pumps, and relatively inexpensive. Or in that case, free :p

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Speaking of which, I might be keeping this pump for my [hopefully] future VR-4. It seems so unique.

Quote:

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Originally Posted by spfan

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

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It supposedly ran as quiet as stock did. This could be subjective though. I wonder how it sounds with a BAP.

Quote:

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Originally Posted by HLxDrummer

Very interesting. Does it go in like stock or does it look like it required modification?

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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.