1998 s10 Blazer

I have been having trouble with my 1998 Chevy s10 blazer 4 wd SUV. It has been idling not as smoothly and hesitation occasionally on the freeway. The emission control light is on and a camshaft position sensor or possibly a crankshaft position sensor was replaced, but the problem is not fixed. We think it may be a fuel pump problem? Especially, if the fuel pump is located in the rear undercarriage of the car. It kind of whines when you turn the car on and off and has been getting worse. Any ideas?

What codes does the computer have stored. If the light is on there are codes, and they should be checked.

If you suspect a fuel pump problem, have the fuel pressure tested. Has the fuel filter ever been replaced? If not, now is a good time.

Yes the fuel pump is in the rear. Actually, it’s inside the fuel tank, so you want to make sure it’s really the source of the problem before you attempt to replace it.

Don’t guess. Have the codes read and test the fuel pressure.