BADASS of New England

An automobile club for the enthusiast who enjoys the last of the big GM cars. The rear wheel drive B and D bodys. Chevrolet Impala SS, Caprice, 9C1, Buick Roadmaster, Oldsmobile Custom Cruiser, Cadillac Fleetwood
 
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 Gas Tank Keeps Building Pressure.

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cloud 9



Posts : 563
Join date : 2009-10-03
Age : 48
Location : Dover, NH

PostSubject: Gas Tank Keeps Building Pressure.   Fri Apr 30, 2010 8:16 pm

Has anyone ever had a problem with their b-body not starting because of excess pressure in the fuel tank. Every once in a while the cappy won't start. I get out and open the gas cap and woosh, a rush of air comes out. Then it starts right up. The other day it wouldn't start so I tried it to no avail. I realized I did not hear the fuel pump. I whacked the gas tank and it started right up. Could this be the result of a malfunctioning fuel pump?
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toomanytoyz
Club President


Posts : 6871
Join date : 2009-01-20
Age : 40
Location : East Hampstead, NH USA

PostSubject: Re: Gas Tank Keeps Building Pressure.   Fri Apr 30, 2010 8:24 pm

Mine only makes that whoosh if I've run the tank really low. Is that the case with you?

Could be the gas cap, possibly.

Have you checked the fuel pressure at the rail when it happens?

Do you hear the fuel pump turn on when you click the key to "run"? It should come on for a few seconds and then shuts off.

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Bill "The Verb" Crovo - Resident Car Slut & Unicorn Hunter

A Toasted Marshmallow, A Long German, A Lame Suburban and expensive dreams...
Missing all my previous B's, D's and V... Sad
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www.badassofne.net
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sdstick



Posts : 4278
Join date : 2009-03-20
Location : Revere, MA

PostSubject: Re: Gas Tank Keeps Building Pressure.   Fri Apr 30, 2010 8:36 pm

The whoosh is normal & changes with the purge solenoid
http://shbox.com/1/evap_sol.jpg
You can read up on how it really works but I refuse to learn that til I have to.
Whacking the fuel tank does free up a hung up fuel pump
Do you run the car low on fuel alot?
Once a fuel pump starts hanging up get rid of it, the filter & harness

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Steve


96BBB 28K 3.42 Bolt-ons
95BBB 100K 3.73 383 New DD...already broke fixt the 4L60E twice
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Waldo617



Posts : 194
Join date : 2010-03-20
Age : 28
Location : Milton

PostSubject: fuel pumps going bad after 100k miles   Fri Apr 30, 2010 8:39 pm

my fuel pump started malfunctioning at about 105,000 miles if thats any help
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Guest
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PostSubject: Re: Gas Tank Keeps Building Pressure.   Fri Apr 30, 2010 8:47 pm

Your evap system is not working correctly.
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GasTT



Posts : 2675
Join date : 2009-01-19
Age : 28
Location : Treasure Coast, FL

PostSubject: Re: Gas Tank Keeps Building Pressure.   Sat May 01, 2010 9:33 pm

my caprice is having a similar problem. sometimes i get no fuel pump prime when i turn the key = no start. I go under my hood and manually prime it to get it started. Doesn't happen every time.
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mean ss



Posts : 648
Join date : 2009-02-25
Age : 59
Location : Nashua NH.

PostSubject: Re: Gas Tank Keeps Building Pressure.   Sat May 01, 2010 9:41 pm

GasTT wrote:
my caprice is having a similar problem. sometimes i get no fuel pump prime when i turn the key = no start. I go under my hood and manually prime it to get it started. Doesn't happen every time.

try a new relay
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