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I have been trying to find a problem with my 98 blazer stalling i replaced fuel pump about a month ago + filter replaced ign switch and read in this post how to check fuel pump relay . i also read to start up and remove relay to see if ops is working the truck should continue to run mine stalls i wanted to make sure this was corect and possibly the problem ? i disconected the ops and started the truck and it dident seem to make a difference it ran for a while and stalled reconected did same thing.have fuel pressure gage on truck turn key on goes to 62 lbs with pump running then about 55 lbs when pump stops when i start it it stays on 55 lbs untill it starts to stall then it goes to about 45 lbs and stalls
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When was last tune up? Plugs, wires, all fluids & filters especially fuel filter? I'd start there and run a good fuel system cleaner through it. Also avoid cheap fuel - lot of questionable fuel at cheap/cut rate stations.
Mine stalled when I stopped and it was the Idle Speed Motor. If it only stalls when you stop, I would check that before messing with the fuel filter or pump.
When you turn the ignition to on you should here the fuel pump run. If you aren't hearing it then it sure sounds like the pump. Assuming nothing has happened to the car to affect electrical connections. I don't think there is a fuse for the pump but worth checking also.
have fuel pressure tested has to be over 80psi mine was doing same thing first fuel pump had installed went bad after 3 months guy didnt change filter in tank.mechanic said never let go past quarter tank!
That's what it looks like.
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