External vs internal fuel pump
Melting Slicks
Joined: Mar 2002
Posts: 2,882
Likes: 766
From: Sligo PA
I agree. I have a Walbro 255 in tank with 36 pound injectors. I'm upping that this winter to a 450 lph Walbro in tank pump with Holley 76 pound injectors for my bigger motor and for flex fuel. There isn't much reason to use an external pump anymore.
Safety Car
Joined: May 2001
Posts: 4,759
Likes: 1,647
From: Fairfax Virginia
I would talk to one of the folks that sells those Walbro and other "Quality Fuel pumps". I thought the Walbro 255 would support close to 600 horsepower on a Normally Aspirated Engines or something ridiculous. I went from a Holley External Fuel pump to a Internal Fuel Pump and Fuel pressure Regulator In-Tank. I really like the No-Return system that Holley Used in their OEM Fuel Tank Modules.
The difference in the noise level alone was very noticeable, the old external pump makes some racket even though it was isolated from the frame. The In-Tank Fuel Pump is a great system, add the FPR and you have a great solution all buried in the fuel tank.
What kind of engine will you be powering with the Walbro 450 and 76 pound injectors? I understand the Flex fuel systems uses a larger volume of fuel. I know very little about the Flex Fuel as they don't have many stations in the Washington DC area.
My 1968 427 Corvette has a Holley EFI system on it and I think it uses Four 100 pound injectors in the throttle body. Running near 60 psi of fuel pressure the engine is still learning the correct data for every possible situation. It does an awesome job keeping the engine running right where you want it.
The difference in the noise level alone was very noticeable, the old external pump makes some racket even though it was isolated from the frame. The In-Tank Fuel Pump is a great system, add the FPR and you have a great solution all buried in the fuel tank.
What kind of engine will you be powering with the Walbro 450 and 76 pound injectors? I understand the Flex fuel systems uses a larger volume of fuel. I know very little about the Flex Fuel as they don't have many stations in the Washington DC area.
My 1968 427 Corvette has a Holley EFI system on it and I think it uses Four 100 pound injectors in the throttle body. Running near 60 psi of fuel pressure the engine is still learning the correct data for every possible situation. It does an awesome job keeping the engine running right where you want it.
Melting Slicks
Joined: Mar 2002
Posts: 2,882
Likes: 766
From: Sligo PA
I would talk to one of the folks that sells those Walbro and other "Quality Fuel pumps". I thought the Walbro 255 would support close to 600 horsepower on a Normally Aspirated Engines or something ridiculous. I went from a Holley External Fuel pump to a Internal Fuel Pump and Fuel pressure Regulator In-Tank. I really like the No-Return system that Holley Used in their OEM Fuel Tank Modules.
The difference in the noise level alone was very noticeable, the old external pump makes some racket even though it was isolated from the frame. The In-Tank Fuel Pump is a great system, add the FPR and you have a great solution all buried in the fuel tank.
What kind of engine will you be powering with the Walbro 450 and 76 pound injectors? I understand the Flex fuel systems uses a larger volume of fuel. I know very little about the Flex Fuel as they don't have many stations in the Washington DC area.
My 1968 427 Corvette has a Holley EFI system on it and I think it uses Four 100 pound injectors in the throttle body. Running near 60 psi of fuel pressure the engine is still learning the correct data for every possible situation. It does an awesome job keeping the engine running right where you want it.
The difference in the noise level alone was very noticeable, the old external pump makes some racket even though it was isolated from the frame. The In-Tank Fuel Pump is a great system, add the FPR and you have a great solution all buried in the fuel tank.
What kind of engine will you be powering with the Walbro 450 and 76 pound injectors? I understand the Flex fuel systems uses a larger volume of fuel. I know very little about the Flex Fuel as they don't have many stations in the Washington DC area.
My 1968 427 Corvette has a Holley EFI system on it and I think it uses Four 100 pound injectors in the throttle body. Running near 60 psi of fuel pressure the engine is still learning the correct data for every possible situation. It does an awesome job keeping the engine running right where you want it.
Melting Slicks
Joined: Jun 2011
Posts: 2,384
Likes: 385
From: Leland , North Carolina
Thread Starter
Racer
Joined: Mar 2018
Posts: 411
Likes: 97
From: Las Vegas
Pumps – DeatschWerks. Get an in tank one from here,
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
Every 2027 Corvette Engine Explained
Joe Kucinski
Designer Imagines A Corvette That Looks More Like a Corvette Than the Corvette
Verdad Gallardo
10 Ugly Corvettes That We Still Kinda Love
Joe Kucinski
Top 10 Most Expensive Corvettes Ever Sold on Bring A Trailer
Brett Foote
10 Things Every Corvette Owner Needs (2026 Edition)
Michael S. Palmer
8 Most "Only Corvette Owners Understand" Quirks and Problems
Pouria Savadkouei
10 Reasons the C6 Z06 is Still A Performance Benchmark After 20 Years
Joe Kucinski
How Much Horsepower Every Corvette Engine "LOST" in 1972
Joe Kucinski
