Farmvette

Hi all

Looking for recommendations for a fuel pump for a up-to-700whp NA motor running E85. Stock Z06 pump can't keep up. I have come across DW external pumps and Racetronix / Walbro in-tank options, but what's working based on actual experience?

Katech_Zach

We used the following on our 500 cubic inch LS that made 675rwhp on 93:

LPE L710140105
Racetronix FPWH-008
Racetronix IPH-008

You can also add a voltage booster if you would like, but likely not needed.

FNBADAZ06

With 1050X injectors, I'm running the Walbro 450 with Racetronix Hotwire kit. Worth noting I also run a DC Power billet alternator to make sure I've got adequate amperage at high RPM to the pump as well.
I also have a mechanical fuel pressure gauge at the rails to confirm 60+ psi at 7800 RPM.
700 +/- 10 RWHP on E.

jayyyw

A walbro 450 should do it. I ran a Walbro 525 and had some pressure drop issues at higher RPM. I also ran the hot wire kit and 8an feed line. The 525 flows too much for the stock hat. I made 707whp, NA.

My new engine should make close to 800whp. I modified the stock hat and run the Racetronix dual 340lph pumps, now.

Farmvette

Is that using the Racetronix C6 Fuel Pump Module with the Walbro 450 pump, or an external Walbro 450 pump?

ToppThat

This is what is replacing the noisy aeromotive very difficult to install though.

FNBADAZ06

Standard drop in replacement pump in existing bucket, along with the Racetronix Corvette Hotwire kit.
They didn't offer a complete kit back when I did mine.

92rsz

I could be wrong, but I believe the lingenfelter and racetronix modules use the same walbro 274 fuel pump. I have the lingenfelter kit to install if e85 kills my stock pump. So far it's keeping up at 40% e

Farmvette

Hi all

Thanks for your inputs. I went with the Racetronix TU475-450 LPH in-tank pump module with the Walbro 450 and wiring harness upgrades, and it's running fine; car made ~670whp on E85 and holding 58-61psi fuel pressure.