fuel pump assembly -bad? - 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> Hotrodding Basics
User Name
Password
lost password?   |   register now

Reply
 
LinkBack Thread Tools
  #1 (permalink)  
Old 08-07-2007, 06:52 AM
Cape Cod Bob's Avatar
Registered User
 
Last wiki edit: How to title a hot rod Last photo:
Join Date: Jul 2007
Location: MA
Posts: 1,122
Wiki Edits: 1

Thanks: 0
Thanked 25 Times in 17 Posts
fuel pump assembly -bad? all fixed

Now that I have my fuel tank out and the fuel pump assenbly removed how do I make sur the pump works/don't work before I plunk down $300 for a new one .Thanx

    Advertisement

Last edited by Cape Cod Bob; 08-09-2007 at 09:46 AM. Reason: Fixed
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
  #2 (permalink)  
Old 08-07-2007, 08:28 AM
Holder350's Avatar
Auto Parts Professional
 
Last photo:
Join Date: Feb 2005
Location: Whitesburg, TN
Posts: 1,037
Wiki Edits: 0

Thanks: 0
Thanked 1 Time in 1 Post
were you having problems before dropping the tank?

What vehicle?

Do you have a pressure gauge to read the pressure on the fuel rail?
Reply With Quote Quick reply to this message
  #3 (permalink)  
Old 08-07-2007, 10:22 AM
37 plymouth coupe's Avatar
Registered User
 
Last photo:
Join Date: Apr 2006
Location: alabama gulf coast
Age: 67
Posts: 63
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
re: Fuel pump assembly bad

I assume your fuel pump is electric and inside the tank. Some vehicles with electric fuel pumps have a special oil pressure sending unit (Vega for instance) that, if bad, will not allow the electric fuel pump to work. Check you oil pressure sending unit if it has two wires on it. I have used the Vega sending units on my oval track Fords, dragster and even my street rod simply because of the feature that will shut down the fuel pump if oil pressure drops. Also, cars with electronic fuel injection have a safety shut off switch (in case of an accident) I have seen these triggered and will not allow the fuel pump to work. Need to know...year, make, model!
Reply With Quote Quick reply to this message
  #4 (permalink)  
Old 08-07-2007, 01:19 PM
Cape Cod Bob's Avatar
Registered User
 
Last wiki edit: How to title a hot rod Last photo:
Join Date: Jul 2007
Location: MA
Posts: 1,122
Wiki Edits: 1

Thanks: 0
Thanked 25 Times in 17 Posts
THANX for the responses. It is a '97 Dakota. Electric fuel pump in the tank. Would not start. Has spark because squirting start fluid in intake will run 'till that burns off. Opened fuel line at coupling on frame and cranked. No fuel came out. Tested wires going to tank and found hot wire on only one wire measured to ground, and only when cranking. This may not be the correct way to test? Did not get any response from earlier thread so went ahead and removed tant and pulled pump assembly. With pump assembly out ,I put 12 volts to plug connectors and it ran fine.
Now I assume something must have to tell the pump to turn on. I assume there should be voltage present whenever the key is in the run position.
Am I correct?Where should I look ?
Thanx again.
Reply With Quote Quick reply to this message
  #5 (permalink)  
Old 08-07-2007, 06:17 PM
1ownerT's Avatar
Home School Valedictorian
 
Last wiki edit: Health and safety in the shop or garage Last photo:
Join Date: Dec 2004
Location: Iowa
Age: 53
Posts: 1,645
Wiki Edits: 4

Thanks: 0
Thanked 3 Times in 3 Posts
There is a fuel pump relay under the hood, in the Power Distrubition Center on the left wheel well. The fuse for it is there as well, it is fuse #1-20a
Reply With Quote Quick reply to this message
  #6 (permalink)  
Old 08-07-2007, 06:45 PM
RPM's Avatar
RPM RPM is offline
World Class ASE tech
 
Last photo:
Join Date: Nov 2004
Location: Hills of TN
Age: 63
Posts: 703
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
I am not sure about your truck, but I had a Chevy Tahoe do that and it was a bad ignition key. Seems the key had a memory chip in it for security and the chip lost its memory. Had to make the chip relearn. It was easy to do. Turn the ignition on and just wait 10 minutes and it started right back up.
Reply With Quote Quick reply to this message
  #7 (permalink)  
Old 08-09-2007, 09:40 AM
Cape Cod Bob's Avatar
Registered User
 
Last wiki edit: How to title a hot rod Last photo:
Join Date: Jul 2007
Location: MA
Posts: 1,122
Wiki Edits: 1

Thanks: 0
Thanked 25 Times in 17 Posts
Turns out it was the fuel assembly. The pump in it still made noise and pumped a little when in a bucket and no lines attached, but not when hooked up. Must have been worn out impeller or what ever is used to pump. I put in a new one and put it back together and runs OK. Only thing I need to do is get the new rubber line I put on the outlet over the ridge as the clamp will not hold. I found out the hard way, on the road. Fortunatly in front of my brothers in law house. The line popped off. I put it back on and will need to do a more permanent fix at home.
Also need to R&R the filler neck as moving it around has caused a drip when filling and I will only put in a 1/2 tankful for now.
Does anyone know the pressure that is develeped by the pump? I thought I had that clamp on as tight as I could with a 1/4" nut driver.
THANKYOU to all for the great help.
Now I can get back to working on my '31 .
Reply With Quote Quick reply to this message
  #8 (permalink)  
Old 08-09-2007, 11:58 AM
1ownerT's Avatar
Home School Valedictorian
 
Last wiki edit: Health and safety in the shop or garage Last photo:
Join Date: Dec 2004
Location: Iowa
Age: 53
Posts: 1,645
Wiki Edits: 4

Thanks: 0
Thanked 3 Times in 3 Posts
Fuel pressure should be 49 psi +/- 5 psi at idle, this is at the fuel rail. If it is above 54 psi the regulator is bad.
Reply With Quote Quick reply to this message

Recent Hotrodding Basics 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.



« Fuel Cell | Sbc 400 »

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
Oil leaking near fuel pump..what the heck??? HotRodF100 Engine 13 01-08-2012 05:03 AM
95 gmc jimmy fuel pump won't shut off/fuel pump relay garystrosnider Electrical 7 10-28-2010 07:10 AM
Fuel Pump Not Sending Gas To Carb Why?? Its Not Electric Fuel Pump???? zeeman19 Engine 7 02-13-2007 03:17 PM
93 Suburban fuel pump sabino56 Engine 8 09-10-2005 02:54 PM
Bad fuel pump??? ffcagle34 Engine 2 06-20-2004 11:15 PM


All times are GMT -6. The time now is 08:28 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.