87 TBI blowing IGN fuse all of a sudden?! - 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 02-24-2011, 06:54 PM
Registered User
 
Last photo:
Join Date: Mar 2010
Location: NL
Posts: 138
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
87 TBI blowing IGN fuse all of a sudden?!

87 454 TBI has other issues like running rich but that's probably unrelated.

Always started fine but from one day to the next has decided to start blowing the IGN fuse as soon as I turn the ignition on.

Poured some fuel down the TBI and it ran a few seconds, so spark not the issue, fuel delivery.

Crawled under the Suburban and found a wiring coming off the pump. One black, white and one purple. Hooked up a wire to the +12v on the battery straight to the pump and presto starts right up and runs. (also my fuel gauge seems to be grounded out as it shows way over full all the time) maybe the 12v to the fuel pump is grounding out too?

What else is on that IGN 12v?

It's worth noting that once that truck has a run a few minutes and is switched off the fuel pump makes a ticking noise that sounds like a bouncing marble coming directly out of the fuel tank.

Anyways, what could be grounding out? Or is it the obvious? Anyone have a daigram on these motors of which wire is which? If I could get my fuel gauge fixed to that would be a bonus!

thanks in advance,

    Advertisement
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
  #2 (permalink)  
Old 02-25-2011, 04:14 AM
Registered User
 
Last photo:
Join Date: Mar 2010
Location: NL
Posts: 138
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
so to summarize, I've got spark, but no fuel when this fuse is blown. It will run with ign fuse blown with power straight to the pump.

So it's not the ignition controle module.

Could it be oil pressure sender related?
Reply With Quote Quick reply to this message
  #3 (permalink)  
Old 02-25-2011, 11:26 AM
vicrod's Avatar
life is a ride
 

Last journal entry: 2014
Last photo:
Join Date: Nov 2005
Location: Telford, PA
Age: 71
Posts: 1,341
Wiki Edits: 0

Thanks: 0
Thanked 59 Times in 55 Posts
When you power the fuel pump direct it runs OK but I would check the current draw. The pump could still have internal problems and be causing the fuse to blow. Anything over 10 amps suspect the pump to be going bad.
Also the fuel gauge sender (in the tank) is powered by the same fuse as the pump. It could be causing the fuse to blow.
Beyond that there is the fuel prime relay, the hot fuel module and the oil pressure switch (fuel pump run) are not likely to be causing the fuse to blow.
You can get the wiring diagrams at www.autozone.com . You need to register then select -- do-it-yourself, then -- repair info, then -- enter vehicle, then -- select vehicle repair guide, then -- select chassis electrical, then -- select wiring diagrams.

vicrod
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
Keeps blowing out my fuse! redfish211 Electrical 3 10-21-2010 07:33 PM
Blowing a fuse!!!! rhinz1966 Electrical 3 05-25-2010 09:26 PM
Fuse keeps blowing AjaxRollers Electrical 7 09-03-2009 07:07 PM
Ignition fuse keeps blowing... jacobm99 Electrical 1 07-31-2006 05:04 AM
Keeps Blowing Fuse hotrod48 Electrical 17 09-29-2005 12:20 PM


All times are GMT -6. The time now is 01:18 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.