no power to fuel pump - 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> Electrical
User Name
Password
lost password?   |   register now

Reply
 
LinkBack Thread Tools
  #1 (permalink)  
Old 11-29-2009, 12:16 PM
Registered User
 
Join Date: Nov 2009
Location: missouri
Posts: 2
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
no power to fuel pump

I have a 1995 chevy lt1 in 34 master coupe. It was running fine than I stopped and fueled up, than started it. It ran for 30 seconds than died. The fuel pump is not coming on. I can run a wire directly to it and it comes on. the fuse is good. Could the computer have went bad?

    Advertisement
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
  #2 (permalink)  
Old 11-29-2009, 12:42 PM
ericnova72's Avatar
More for Less Racer
 
Join Date: Jan 2007
Location: S.W. Lower Michigan
Age: 47
Posts: 9,260
Wiki Edits: 0

Thanks: 26
Thanked 433 Times in 395 Posts
Isn't there a relay between the computer and the pump?? The computer doesn't have the amp rating high enough to run a high load device like the pump directly, it will burn up the computer. The computer triggers the relay, which runs the pump.
Reply With Quote Quick reply to this message
  #3 (permalink)  
Old 11-29-2009, 04:23 PM
Registered User
 
Last wiki edit: Wheelbase database Last photo:
Join Date: Jan 2007
Location: Virginia
Posts: 3,537
Wiki Edits: 1

Thanks: 6
Thanked 148 Times in 135 Posts
There should be two circuits that power the pump. The computer runs the pump for about two seconds through a relay when you first crank the starter. This primes the injectors. Once the oil pressure in the engine comes up, a separate oil pressure switch closes and completes the fuel pump circuit independent of the computer. If the pump does not come on when you first crank the engine, check the relay.
Reply With Quote Quick reply to this message
  #4 (permalink)  
Old 11-29-2009, 04:30 PM
468c-10's Avatar
468c-10
 
Join Date: Oct 2009
Location: tennessee
Age: 29
Posts: 32
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
I had the same prob with my 1990 truck. I had a loose ground check an see if you have power at the relay when you turn on your switch
Reply With Quote Quick reply to this message
  #5 (permalink)  
Old 11-30-2009, 07:27 AM
Registered User
 
Join Date: Nov 2009
Location: missouri
Posts: 2
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Thank you for the suggestions/info. I will check these out and let you know.
Reply With Quote Quick reply to this message

Recent Electrical 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:
If you do not want to register, fill this field only and the name will be used as user name for your post.
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
DARK brown--BLACK plugs SBC Joshua Lee Engine 130 02-03-2008 09:12 AM
Electric fuel pump shut-off mur39 Electrical 22 03-05-2007 05:48 PM
90s SBC Power Steering Pump pulley Removal Help Mustangsaly Engine 12 10-08-2006 06:00 PM
Troubleshooting Fuel Pump Power on 87' Corvette edge Electrical 1 07-02-2006 06:12 PM
vapor lock, sbc, hot fuel pump Walker Engine 1 07-19-2004 10:31 PM


All times are GMT -6. The time now is 06:50 PM.


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.