'95 Chevy S10 Blazer - Losing Fuel Pressure

Posted in the Chevrolet S-10 Forum

Tom K

United States

#1 Mar 11, 2010
I have a 95 Chevy S10 Blazer. Replaced fuel pump, sending unit, and filter. It looses fuel pressure at shut off - falls to nearly zero within 1 minute. Once started - runs good - lots of power. Any ideas?
Ron

Logansport, IN

#2 Mar 24, 2010
Sounds like the check valve built into the pump outlet is bleeding pressure off.... or the fuel regulator is bleeding off?
Amanda

Roswell, GA

#3 Jan 19, 2011
How much fuel pressure does a 95 Chevy S-10 Blazer needs to have?
Amanda

Roswell, GA

#4 Jan 19, 2011
How much fuel pressure does a Chevy S-10 Blazer Vortec 4.3 need to have?
pelfrey

Union City, IN

#5 Apr 19, 2011
Amanda wrote:
How much fuel pressure does a Chevy S-10 Blazer Vortec 4.3 need to have?
it runs anywhere from 55-63
Mr James

Clarksville, TN

#6 Jan 6, 2012
95 chevy blazer 4.3. wont start after setting for 2 or 3 hrs. but will start with a lite shot with starter fluid to the throttle body. replaced fuel filter, plugs, wires air filter. fuel pressure with key on and engine not running is 56 psi but drops to 46 psi in 20 minutes. with engine running its a steady 56 psi. when you turn engine off pressure holds for a few minutes but drops to 42 psi in about 30 minutes. trying to figure out if its the pump or regulator. what do y'all think?
joshcnc

Houston, TX

#7 Nov 1, 2013
Mr James wrote:
95 chevy blazer 4.3. wont start after setting for 2 or 3 hrs. but will start with a lite shot with starter fluid to the throttle body. replaced fuel filter, plugs, wires air filter. fuel pressure with key on and engine not running is 56 psi but drops to 46 psi in 20 minutes. with engine running its a steady 56 psi. when you turn engine off pressure holds for a few minutes but drops to 42 psi in about 30 minutes. trying to figure out if its the pump or regulator. what do y'all think?
My cousin inlaw has the year and model with the same thing as well. Someone please help us understand what it takes to get it right.

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