fuel sending unit leak?? - 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 04-18-2008, 10:28 PM
garinhash's Avatar
Transform and Roll Out!
 
Join Date: Mar 2007
Location: california
Age: 29
Posts: 7
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
fuel sending unit leak??

so i am in the beginning stages of restoring my fathers 57 nomad(he passed away last feb ) and i finnaly got it running.
i have just been driving around the block everyday just to get it used to running again( its been stitting around for around 20 years).
today when i was leaving for work i noticed the smell of gasoline and noticed that gas was leaking from the tank( not alot but enough to be a issue).
so after work i lifted the back end up and climbed under, after a few minutes i had realised that there was some rubbery epoxy like substance over the sending unit on the gas tank... and thats were it was leaking from.
so i took off the old rubber stuff cause it was falling off anyways. and drove the car around the block a few more times hopefully getting the gas level lower so it wont leak quite as much.
does this sound like the sending unit gasket seal is bad?
im hoping its not something worse, cause i know that to even remove the tank you need to drop the axel, leaf springs, and suspension and i dont have the resources to do that.
i was hoping that this is a easy fix i can do, it looks possible to remove the sending unit and change the gasket, but has anyone else changed the gasket without removing the gas tank?

    Advertisement
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
  #2 (permalink)  
Old 04-21-2008, 09:35 AM
Registered User
 
Last wiki edit: General Motors transmissions Last photo:
Join Date: Mar 2006
Location: near Yellowstone park
Posts: 4,380
Wiki Edits: 27

Thanks: 12
Thanked 267 Times in 249 Posts
best to pull it

leaking tanks are dangerous. someone could flip a cigarette and poof your car would be gone. I am not familiar with the 57 but some older cars used paper gaskets and others use a rubber o ring. sometimes undercoating was sprayed on tanks
Reply With Quote Quick reply to this message
  #3 (permalink)  
Old 04-21-2008, 01:20 PM
Member
 
Last photo:
Join Date: Oct 2003
Location: Alabama
Posts: 181
Wiki Edits: 0

Thanks: 0
Thanked 1 Time in 1 Post
All the aftermarket sending units use a rubber gasket. I think the OEM gasket was some sort of composit material. Sounds like yours may be rubber. This sending unit does not use an "O" ring. It can be changed without removing the tank, provided the fuel level in the tank is below the sending unit. If the screws are rusted in and you break one off, then you will need to drop the tank to repair the broken screw.

First remove the wiring from the unit along with the ground and tape them up. Sparks under your '57 would not be good at this time. Remove the screws, remove the sending unit, and clean the surface of the tank where the gasket goes, then clean the sending unit gasket surface and test fit the new gasket. Coat both sides of the new gasket with Aviation Permatex, available from local auto parts store. Let set for 30 min and slip over the float and up to the sending unit mounting flange, reinstall sending unit. Put a dab of permatex under each screw before installing them for good measure. Don't over-torque the screws because the gasket will squeeze out. Aviation Permatex is fuel resistant, silicon sealers are not.

Since you will have the sending unit out you may as well check it for proper operation with your fuel gauge and calibrate if necessary. If I remember correctly the gasket will only go on one way, otherwise the holes won't line up for the screws.
Reply With Quote Quick reply to this message
  #4 (permalink)  
Old 04-21-2008, 04:27 PM
T-bucket23's Avatar
Hotrodders.com Moderator
 
Last wiki edit: Engine basic condition - how to check Last photo:
Join Date: Aug 2005
Location: Massachusetts
Age: 57
Posts: 5,291
Wiki Edits: 26

Thanks: 7
Thanked 130 Times in 114 Posts
Sounds like someone tried to patch it from the outside rather than replacing the rubber ring. I am fairly certain the 57's used a rubber o-ring.
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
how to connect wiring to sending unit zipfactor Electrical 2 05-12-2006 11:34 AM
Fuel Gauge Sending Unit 3bytheknee Hotrodders' Lounge 1 02-02-2006 03:02 PM
fuel sending unit ksm Electrical 3 07-28-2004 12:08 PM
73 Pontiac Firebird Fuel Pickup Sending Unit Rad Ray Engine 3 02-05-2003 08:39 AM
Oil Sending Unit Assistance MI2600 Engine 3 09-11-2002 07:55 AM


All times are GMT -6. The time now is 09:31 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.