Question about 1997 Chevrolet Blazer

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I may be changing a fuel pump on a1997 blazer for someone i don't want to change it if thats not the problem what tests can i do to be sure its the pump .they told the pump is going bad but they are not mechanics

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If you can hear the pump running it likely is good If there is power to it and good ground bit ot dosen't run then it may have failed. Check filter, pump relay and fuse and check pressure (with gauge) at fuel rail. If you can briefly start it by spraying carb cleaner into the throttle body while cranking,then yes, check the remainder of the fuel system. If not, check to make sure there is spark getting to the plugs.

Posted on Oct 07, 2009

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Check to see if there's a drop in fuel pressure from the fuel rail.Another quick test is have someone turn the igition on to run( not start)Listen for the fuel pump which means you will have to get as close as possible to the gas tank to hear this

Posted on Oct 07, 2009


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I have a 1999 Chevy Blazer I changed the fuel pump I have to crank on it a long I have to crank on it a long time before it will start. The I don't goes up and down it bogs down an it bogs down and dies....

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Check your fuel pressure.
Hopefully this tank is not full, as you need to pull the tank to change fuel pump, this is mounted onto the tank through the top. There are several plastic fitting and hose connecitons on the tank as well as the fuel level connector. There may also be a Vapor pressure sensor on the tank. After unbolting the tank lower the tank just far enough to remove the wireing and hoses. Make sure top of tank is clean. If you have to move tank out from under Blazer cover hose aconnectionss and wash off top of tank and flange area. Unlock flange and R and R pump assembly. Reconnect hoses and wires, reinstall tank. Connect hose to fuel test port on engine, purge air from fuel system. Check the fuel pressure. InMrFixIt

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Vapor lock it sounds like.
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Well, obviously someone didn't tell you the truth because spraying into intake doesn't make the vehicle turn over any better. You have ignition or fuel delivery problem. Start by taking fuel line off at intake and crank engine a couple times catching any gas in a cup or something. If none, then trace fuel line back and under vehicle til you find filter. Should be under driverside midway back on inside of frame. Change this and try test again. If no gas, see if fuel pump is on motor(mechanical pump). Change this and test again. If not on motor then it's in gas tank(electric pump). Most cases the tank has to be lowered to take out pump, careful not to drop, dent or make sparks. Some came with access through the floor so check that first. Normally you can hear an electric pump come on when you turn the key. Good Luck

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change the fuel filter, check the fuse for the sending unit and the fuel pump relay and if all these test good it maybe the pump getting weak

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Was it a factory GM pump? Check for power at the Grey wire going into the pump it should have 12V for 2 seconds after you turn on the key so you cant do it by yourself get someone else to either turn on the key or watch the test light, If you have no fuel pressure but have 12V for 2-3 seconds then you have a bad pump and be sure to double check the Ground make sure its clean and secure also change the fuel filter at the same time. Forget the oil changes they do nothing for the car oh yea change it one every 4 or 5 years is way fiine but change the fuel filter EVERY EVERY 15,000 miles no matter what. If this information helps please give me a fixya rating.
Oh yea make sure you buy a Factory GM pump you'll be gald you did,

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