Whats up with this fuel pump return line? - Hot Rod Forum : Hotrodders Bulletin Board
Hotrodders.com -- Hot Rod Forum



Register FAQ Search Today's Posts Unanswered Posts Auto Escrow Insurance Auto Loans
Hot Rod Forum : Hotrodders Bulletin Board > Tech Help> Engine
User Name
Password
lost password?   |   register now

Reply
 
LinkBack Thread Tools
  #1 (permalink)  
Old 07-05-2010, 02:38 PM
Registered User
 
Last photo:
Join Date: May 2010
Location: stockholm, sweden
Posts: 7
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Whats up with this fuel pump return line?

Hello!

I've bought a Carter M6626 for my chevy 383 and there's one thing I don't get about it.
Can you please take a look at the pictures and tell me if this is what it should look like?
Am I supposed to drill it or anything for better flow. That little hole is ridiculous. Whats the purpose?
I've bought another Carter M6626 from Rockauto a while ago and it looked the same I guess I can't have such a bad luck even if its china stuff..

Thanks so far!
Attached Thumbnails
Click image for larger version

Name:	M6626.jpg
Views:	139
Size:	151.0 KB
ID:	46594   Click image for larger version

Name:	M6626vsstock.jpg
Views:	104
Size:	146.3 KB
ID:	46595  

    Advertisement
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
  #2 (permalink)  
Old 07-05-2010, 03:26 PM
DoubleVision's Avatar
Not Considered a Senior Member
 
Last photo:
Join Date: Oct 2002
Location: Heart Of Dixie
Age: 40
Posts: 10,658
Wiki Edits: 0

Thanks: 15
Thanked 60 Times in 57 Posts
It`s done this way to keep the flow and pressure up of the main output line so the bypass is restricted. It`s likely restricted in the factory pump it`s just on the inside where you can`t see it. Make sure you pack the spring cavity of the pump with moly lube or the like, SBC`s don`t have a direct oiling to the fuel pump and when it goes without lube the spring will overheat which will weaken it to the point the spring will float and not pump at upper rpms.
Reply With Quote Quick reply to this message
  #3 (permalink)  
Old 07-05-2010, 11:18 PM
Registered User
 
Last photo:
Join Date: May 2010
Location: stockholm, sweden
Posts: 7
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Thanks for the tip! Never heard of it before though.

I tried to blow through the return line on both models and it didn't feel like there was any restriction inside the old pump but I'll try it again to be sure.
Reply With Quote Quick reply to this message

Recent Engine posts with photos

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the Hot Rod Forum : Hotrodders Bulletin Board forums, you must first register.
Please enter your desired user name (usually not your first and last name), your email address and other required details in the form below.
User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.




Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools

Posting Rules
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
Fuel return line (carbed) - where? McDesign Engine 5 01-24-2010 09:13 AM
fuel pump/ fuel lines bad apple Engine 2 03-12-2009 10:43 PM
Could It be my Fuel Tank / Fuel Line? 10mikeymike Engine 4 09-17-2008 02:25 PM
Help - my fuel pump is leaking KENMO Engine 10 07-01-2007 12:39 PM
efi fuel line sizing / fuel pump Blob Engine 2 09-25-2005 12:25 PM


All times are GMT -6. The time now is 04:45 AM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0 PL2
Copyright Hotrodders.com 1999 - 2012. All Rights Reserved.