94 chevy 4.3 vortec.................................i replaced fuel pump, fuel filter still not getting fuel..re put ground wire .....any sugestions on what the problem might be? thank you
ecm goes in to a flooded mode when the tps (throtle position sensor) has more than 6 volts to it. Their for it dose not give it any fuel to the engine. I have the same problem and i dont kno how to fix it. sry.
Try checking how much fuel preasure you are getting under the hood, there is a valve that looks similar to a tire valve that you screw a guage onto, that engine must recieve no less that 60 psi fuel preasure to make the fuel injectors even fire. try replacing the fuel preasure regulator.
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could be clogged fuel injectors or fuel filter could be plugged or your fuel pump is weak and needing replaced,what makes fuel pumps go bad in most vehichles is driving with less than a 1/4 tank of gas,it gets the fuel pump hot and works it too hard
I recently had similar symptoms from my Kia Rio, hard to start, bad idle in gear, etc.
Ended up being the idle air control valve, you can try cleaning yours with carb cleaner and see if there's any difference.
A clogged fuel filter can produce the same symptoms too, that might be the easiest thing to start with, then it's just a process of elimination from there.
when ordering fuel pump, need to know the vin letter w or z. one is for a carb and the other is for a injection or vortec engine. one puts out 11psi and the other puts out 60psi. is this an in tank fuel pump?
10psi is, as I'm sure you know, about 48psi short of what you need to get it running. Did you verify you're getting a full 12 volts at the fuel pump connector? Check the ground wire also, ohm it out to chassis ground, shouldn't be more then a few ohms. Verify it's making a good connection and the terminals are clean and tight. High resistance in the wiring or a connector in the circuit could cause the fuel pump to not output the right amount of pressure. Did you replace the fuel pump with an aftermarket unit or an oem part?
How is it running before it quits onyou. This could be the culprit of an egr valve. How many miles on thevehicle. The egr seems to die on a certain mileage pattern. Also youcould start by cleaning the egr valve before replacing it. This couldvery well help the situation, but this is just a guess. Hope thishelps!!
replace your MAP sensor(manifold absolute pressure) the map sensor is the computer for your fuel pressure regulator telling how much pressure. Unless your tahoe runs like **** going up hill than it inevitably your fuel pump
you can unplug the fuel pump relay from the truck. using a small piece of wire jumper from terminals 30 to 87 (they sort of make a "T"). Just before you do this have a friend remove the gas cap and listen to see if the fuel pump is running (it should kick on for 2 seconds when the key is turned on). sometimes i put a transmission funnel into the filler neck to act like a megaphone to amplify the sound of the fuel pump running. If the fuel pump runs when you do this you either have a control circuit problem or a bad relay.