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Time to replace fuel pump?

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by GOK5, Nov 28, 2002.

  1. GOK5

    GOK5 Registered Member

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    Was running fine until I ran 2 tanks of gas cleaner. Then engine started to occasional stumble on idle, then escalated to doing it while driving. This seems to happen only after 1 to 2 min. after starting. I check the basics (plugs/wires/repl fuel fltr/EGR) and after a search of this board was thinking fuel pump? Now today, during T-day driving it's now stumbling, then backfiring thru exhaust. Could this be a plugged catalytic conv? I am burning a lot of oil (engine due for repl in spring). Thanks for any replys
     
  2. Z3PR

    Z3PR Banned

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    Could be the cat. Does it have a rotten egg smell ???
     
  3. mattyblazer

    mattyblazer 1/2 ton status

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    Yeah, a clogged cat would make it stumble.

    -Matt
     
  4. 88sub4x4

    88sub4x4 1/2 ton status

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    What year K5 is it? Fill out your profile. It will help people to help you. I will assume it is Fuel Injected. Hook up an in-line fuel pressure gauge, you need to take out the fuel filter and the adapter goes in it's place. Check the pressure at idle and also rev the engine. You should have 16 PSI (I think-Maybe someone else could confirm this) If you have less then that it could be a problem pump or a clogged fuel line. To check the cat. unbolt the y-pipe and let it hang away from the manufolds and drive the truck. It will be loud, but if the truck runs good check for a clogget cat or muffler, or a critter that has moved into your exhaust. /forums/images/graemlins/burb.gif
     
  5. GOK5

    GOK5 Registered Member

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    Thanks guys. I tried to update profile but it won't let me.
     

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