Question about 1994 Chevrolet S-10 Blazer
I have a 1994 chevy s-10 blazer with the 4.3 vortec vin W it has a problem starting more when it is cold in the morning. i have figured it out to be a fuel issue that is between the tank and the pressure test valve at the back of the intake. the fuel pressure is about 58 psi while the pump is running but when it shuts off the pressure drops and settles at about 15-20 psi. it will start with some starting fluid . in reading my manual i have figured it down to a faulty fuel pump or a faulty fuel pulse dampener. not sure exactly where the dampener is located. had a new gm fuel pump installed about 6 months ago. any help is appreciated.
Is there a fuel filter mounted on the frame that is blocked up?
Posted on Apr 09, 2017
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Posted on Jan 02, 2017
SOURCE: 1999 chevy blazer fuel problem
probably not fuel filter . probably going to have to remove the upper intake and replace the fuel injector spider(fuel inj assebly) if it is droping fuel pressure it is leaking into the upper manifold
Posted on Nov 30, 2008
your statement is fuel pump work ok, have you tested for proper fuel pressure. just because the fuel pump works it could have less pressure needed to start the engine. maybe the fuel filter is plugged. start out by replacing the fuel filter, if this doesn't fix it, you need to pressure test the pump. even 10 psi reduction in pressure will allow the engine not to start.
Posted on Nov 05, 2009
Try replacing the fuel filter, but it sounds like you have a weak fuel pump. Your cold start pressure should be 62-65 psi and drop about 5 psi when the engine is running. Anything less then 62 psi is going to cause you to have starting issues, you can also test your fuel pump by blocking off the return line to see if you get 75-78 PSI. this is just a test to see if your fuel pump is still good. If you have less then that with the return line blocked off, replace your fuel pump but check your ground wire first. The ground wire is separate from the wire harness and grounded to the frame and a bad ground will give you a weak pump.
Thank you for using Fixya and good luck
Posted on Mar 20, 2010
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