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Author Topic:   Fuel Pump Question
65_289
Gearhead

Posts: 761
From:
Registered: Jul 2001

posted 11-19-2002 05:36 PM     Click Here to See the Profile for 65_289   Click Here to Email 65_289     Edit/Delete Message   Reply w/Quote
What exactly is an externally bypassed fuel pump? I have seen this on some high-end pumps, but I have no idea what it means. Thanks!

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Moneymaker
Administrator

Posts: 19704
From: Lyons, IL, USA
Registered: May 99

posted 11-19-2002 05:45 PM     Click Here to See the Profile for Moneymaker   Click Here to Email Moneymaker     Edit/Delete Message   Reply w/Quote
That means that the pump has a pressure by pass port that returns fuel to the tank. The "high end" pumps as you call them, are capable of delivering 250 gallons per hour of fuel at well over 30 psi. This is to help the pressure from overcoming the needles and seats on the carbs. The Aeromotive pump that I use on MM is so equipped.

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Alex Denysenko
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NHRA/IHRA/SRA member and licensed Superstock driver
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Quote #1: "I never met a magazine mechanic I liked."
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65_289
Gearhead

Posts: 761
From:
Registered: Jul 2001

posted 11-19-2002 05:47 PM     Click Here to See the Profile for 65_289   Click Here to Email 65_289     Edit/Delete Message   Reply w/Quote
So your pump will return fuel to the tank? I thought the pressure regulators did that?

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Moneymaker
Administrator

Posts: 19704
From: Lyons, IL, USA
Registered: May 99

posted 11-19-2002 06:08 PM     Click Here to See the Profile for Moneymaker   Click Here to Email Moneymaker     Edit/Delete Message   Reply w/Quote
Pressure regulators by design regulate the pressure that the fuel enters the carb/injectors at. They are not by pass devices, although some companies offer by pass regulators also.

------------------
Alex Denysenko
Co-Administrator and Moderator

NHRA/IHRA/SRA member and licensed Superstock driver
MCA member# 53321
NHRA and IHRA SS/LA National Record Holder '00, '01, & '02
Fleet of FoMoCo products including 88 ASC McLaren Mustang #28
Professional Manwhore
The Barry of BarrysGrrl

Quote #1: "I never met a magazine mechanic I liked."
Quote #2: "Make sure brain is in gear before engaging mouth!"
Quote #3: "If you can't run with the big dogs, stay on the porch!"

IP: Logged

65_289
Gearhead

Posts: 761
From:
Registered: Jul 2001

posted 11-19-2002 06:10 PM     Click Here to See the Profile for 65_289   Click Here to Email 65_289     Edit/Delete Message   Reply w/Quote
quote:
Originally posted by Moneymaker:
Pressure regulators by design regulate the pressure that the fuel enters the carb/injectors at. They are not by pass devices, although some companies offer by pass regulators also.


Thanks for the clarification. Is there anything you don't know?

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Moneymaker
Administrator

Posts: 19704
From: Lyons, IL, USA
Registered: May 99

posted 11-19-2002 06:13 PM     Click Here to See the Profile for Moneymaker   Click Here to Email Moneymaker     Edit/Delete Message   Reply w/Quote
Yeah, I don't know nothin' about camshafts!

------------------
Alex Denysenko
Co-Administrator and Moderator

NHRA/IHRA/SRA member and licensed Superstock driver
MCA member# 53321
NHRA and IHRA SS/LA National Record Holder '00, '01, & '02
Fleet of FoMoCo products including 88 ASC McLaren Mustang #28
Professional Manwhore
The Barry of BarrysGrrl

Quote #1: "I never met a magazine mechanic I liked."
Quote #2: "Make sure brain is in gear before engaging mouth!"
Quote #3: "If you can't run with the big dogs, stay on the porch!"

IP: Logged

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