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Posted on Aug 01, 2011
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I need to determine if exsisting in tank fuel pump is good. I have the tanked dropped and fuel pump out. My question is how can I tell if the old pump is still good? My blazer would run before, I thought I had an electrical or steering column problem, like a ghost, after a rain, slight moisture in the air. It would not start, I would go back 6 to 8 hours later, it would fire right up. Until it quit for good. I am getting fire, if I pour gas down the throat it wants to start, but will not stay running. My mechanic friend says it wasn't getting gas to the carb. I am glad I dropped the tank to investigate, as I found several pin holes in the tank. which I have fixed. If not fuel pump, any ideas?????

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  • Posted on Aug 01, 2011
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Ground the motor (electrically) to the frame of your Blazer the apply some 12v power (or 13v) to see if 'she' hums or pumps for that matter. (Some will hum but not pump a thing of course). I'm guessing you have an older K-5 or something. There's a filter between the fuel line and carb if nobody ever showed you that one (on the older ones with 350's 4bbl's anyway).

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