Replaced Fuel Pump! Still runs bad... - Pontiac GTO Forum
User Tag List

 
LinkBack Thread Tools Display Modes
post #1 of 8 (permalink) Old 05-15-2008, 12:34 AM Thread Starter
 
Join Date: Sep 2007
Posts: 37
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Replaced Fuel Pump! Still runs bad...

I described my problem a few weeks ago but I thought it was a lack of fuel supply. Well, I replaced the Holley Red pump with a Holley Blue.

...that did no good.

I think I'm going to rebuild the carb and replace the fuel rail. That way, I know I've got a fuel system that's 100% good to go.

What else could this be? I've heard timinig might be a problem...

What else?
5hundo is offline  
Sponsored Links
Advertisement
 
post #2 of 8 (permalink) Old 05-15-2008, 06:55 AM
Former Super Moderator
 
Rukee's Avatar
 
Join Date: Feb 2007
Location: South Central Wisconsin
Posts: 9,919
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 21 Post(s)
We need more information, what kind of car, engine, what`s the problems your experiencing?
Rukee is offline  
post #3 of 8 (permalink) Old 05-15-2008, 09:28 AM
 
Join Date: May 2008
Posts: 12
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Did you consider the fuel filter?
Nick! is offline  
 
post #4 of 8 (permalink) Old 05-15-2008, 04:26 PM Thread Starter
 
Join Date: Sep 2007
Posts: 37
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Quote:
Originally Posted by Nick! View Post
Did you consider the fuel filter?
Replaced it when I put the new pump on, so it's brand new...
5hundo is offline  
post #5 of 8 (permalink) Old 05-15-2008, 04:29 PM Thread Starter
 
Join Date: Sep 2007
Posts: 37
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Quote:
Originally Posted by Rukee View Post
We need more information, what kind of car, engine, what`s the problems your experiencing?
1967 Le Mans with a 455 and a Holley 750...

It idles fine but as soon as I put a load on it, it dies. I can even rev it up, without issue but as soon as I put it on the road, it dies on me.

Vacuum system? Carb needs rebuild?

I dunno...

Last edited by 5hundo; 05-15-2008 at 04:31 PM.
5hundo is offline  
post #6 of 8 (permalink) Old 05-15-2008, 04:42 PM
Former Super Moderator
 
Rukee's Avatar
 
Join Date: Feb 2007
Location: South Central Wisconsin
Posts: 9,919
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 21 Post(s)
Looking down the throat of the carb, can you see it spray a steady stream of gas as you pump the throttle? In other words, is the accellerator pump working?
Rukee is offline  
post #7 of 8 (permalink) Old 05-15-2008, 08:03 PM
 
speedwrenchx10's Avatar
 
Join Date: May 2006
Location: Central OHIO
Posts: 201
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
What kind of ignition?If it is converted to GM hei distributor unplug vacuum advance hose and see if it will accelerate.The vacuum advance may be pulling the pick up coil wire apart causing no spark.Cover carb with hand when trying to rev if it helps could be lean.Rusted through suction side of fuel line can cause fuel pump to loose prime.Hope this helps.
speedwrenchx10 is offline  
post #8 of 8 (permalink) Old 05-16-2008, 06:50 PM
 
Join Date: Nov 2007
Posts: 168
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Quote:
Originally Posted by 5hundo View Post
1967 Le Mans with a 455 and a Holley 750...

It idles fine but as soon as I put a load on it, it dies. I can even rev it up, without issue but as soon as I put it on the road, it dies on me.

Vacuum system? Carb needs rebuild?

I dunno...

A FEW IDEAS -
1. I had a bad coil that gave me similar indications. I had a points distributor and a stock coil. The coil would work fine until it got warm or when it was under a high spark condition. Then is would just quit working.

2. As basic as it seems, my son's chevelle had similar indications and it ended up being a clogged PCV valve. Idle is about all it could do. The engine couldn't breathe.

3. My 65 Impala SS had a similar problem and it ended up being a hairline crack in the distributor cap. I actually tore the whole engine apart and still didn't fix it. My next door neighbor came over and ripped the distributor cap off and put on a new one one and it ran perfect. I would have never thought of a crack in the cap.

4. Broken down plug wires also have caused me trouble before.

5. Check vacuum and where the vacuum is being pulled from on the carb. I am not an expert on which vacuum you are supposed to use (ported or manifold), but I know it made a difference when we were trying to get the chevelle running again, after the engine was rebuilt.

Good luck. I hate when I can't figure out what is going on.

Dale
70455goat is offline  
Sponsored Links
Advertisement
 
Reply

  Pontiac GTO Forum > The 1964-1974 Pontiac Tempest, Lemans & GTO > 1964-1974 Tempest, Lemans & GTO General Discussion

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Pontiac GTO Forum forums, you must first register.
Please enter your desired user 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:
OR

Log-in











Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



Similar Threads
Thread Thread Starter Forum Replies Last Post
Loud Fuel Pump GTO5150 2004-2006 GTO General Discussion 2 09-05-2011 10:28 PM
06 fuel pump question 06GOAT Engine Discussions 2 05-09-2008 06:32 AM
Choke problem? 66_goat 1964-1974 Tempest, LeMans & GTO Technical and Electrical Wiring 21 06-07-2007 09:21 PM
Computer guages (Autotap OBDII-CAN Diagnostic) MJGTOWISH 2004-2006 GTO General Discussion 3 12-03-2006 10:01 AM
Bad fuel control mod roadracer 2004-2006 GTO General Discussion 0 03-15-2005 01:55 PM

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

 
For the best viewing experience please update your browser to Google Chrome