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Have 2004 trailblazer died driving down road. Replaced fuel pump, filter tps and pressure regulator. Fuel pump is getting 50lbs pressure and truck still wont start what next?
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Your fuel pressure should be between 48-50psi. I think your combination Fuel Filter/Regulator is clogged. Too much fuel pressure can be just as bad as not enough. You may have more than one issue though. You mentioned that while slowing down or traveling over bumpy roads, the truck "goes dead". This symptom sounds more electrical than mechanical. I might start by looking scanning for codes. See if there is anything in the history or current. A loose or faulty wire, loose or corroded connector, ground or worn component could cause your truck to loose power. This trick doesn't help everyone but it takes a second to find out. If you suspect a faulty TPS, depress the gas pedal .5-1" and try to start the engine. If it starts with it feathered but dies when you release the pedal or wont start with the pedal released. Then take a closer look at that connector and sensor. Please let me know if there is anything else. Good Luck.
if it shuts off while driving down the road. and restarts after 10 minutes, its usually a bad crank sensor that does this. it messes up timing and shuts off fuel supply.
Sounds like the fuel pressure regulator is stuck in the open position.I am trying to remember if this engine(Vortec?)has a return line to the tank.If it does,try disconnecting the return(smaller) line,and use something to plug the fitting on the outlet of the fuel on the intake(Use a piece of fuel hose and a bolt_make sure you use a hose clamp,as there is 50 PSI of pressure)
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