Fuel tank - Chevrolet Forum - Chevy Enthusiasts Forums

Chevelle & El Camino This section is intended to cover Chevelle, El Camino, and other GM A or G-Body RWD not otherwise covered

Fuel tank

Reply

 
 
 
Old April 28th, 2017, 5:20 AM
  #1  
CF Beginner
Thread Starter
 
Join Date: Apr 2017
Location: Georgia
Posts: 3
Default Fuel tank

I have developed a vacuum in my gas tank as the level goes down. I am also using more fuel.
Homeboy 44 is offline  
Reply With Quote
Old April 28th, 2017, 8:32 AM
  #2  
CF Monarch
 
tech2's Avatar
 
Join Date: Mar 2011
Posts: 6,046
Default

did this occur after changing the tank or sending unit? If not, try replacing the fuel cap...older vehicles used vented caps that relieve pressure or vacuum.
tech2 is offline  
Reply With Quote
Old April 28th, 2017, 4:21 PM
  #3  
CF Monarch
 
kevinkpk's Avatar
 
Join Date: Jul 2011
Posts: 4,129
Default

Originally Posted by tech2 View Post
did this occur after changing the tank or sending unit? If not, try replacing the fuel cap...older vehicles used vented caps that relieve pressure or vacuum.
Yes, you probably will need a vented gas cap.
kevinkpk is offline  
Reply With Quote
Old April 29th, 2017, 1:19 PM
  #4  
CF Beginner
Thread Starter
 
Join Date: Apr 2017
Location: Georgia
Posts: 3
Default

Originally Posted by tech2 View Post
did this occur after changing the tank or sending unit? If not, try replacing the fuel cap...older vehicles used vented caps that relieve pressure or vacuum.
Thanks, I'll give it a try. Would be a cheap fix.
Homeboy 44 is offline  
Reply With Quote
Old April 29th, 2017, 4:03 PM
  #5  
CF Beginner
Thread Starter
 
Join Date: Apr 2017
Location: Georgia
Posts: 3
Default

Replaced the gas cap, no change. Do you think the float could be stuck? I've gone from 15 mpg to about 4.
Homeboy 44 is offline  
Reply With Quote
Reply
 
 
 


Thread Tools
Search this Thread
Sponsors
 
  • Ask a Question
    Get answers from community experts
Question Title:
Description:
Your question will be posted in: