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Re: I just changed my fuel pump but engine keeps...
I need much more information to answer your question. Is this problem constant? Is the engine light on or did you retrieve any engine code/s. If so what are the digits? What is the history of the truck? The truck is 11 years old, what is the mileage on it? Does the engine use oil? Could be a clogged CAT. When does it stall? Does it matter if the engine is hot or cold? Does the engine idle smooth or rough? Is there a misfire? Have you checked the engine out for any noticeable problems? Maybe a broken vacuum line or sensor, or faulty wiring.
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taken from: http://flashoffroad.com/Diesel/troubleshoot/troubleshoot.htm
Here is an easy way to zero in on a stalling problem.
If it feels like someone reached over and turned off the key and it fires back up right away it's the injection pump.
If the same thing happens but it has to cool down before restarting it's the PMD / FSD(pump mounted driver).
If it stumbles and than stalls then it is air in the fuel lines. If it is this one try switching fuel tanks and just turn the key to run but don't start the engine. Listen to the fuel pump for a change of noise pitch. The pump is really loud when the pump is out of fuel and will have a muffled sound when pulling fuel. Sometimes the baffle in the main tank will brake away from the tank and the pump will suck air when the tank is just off full.
Also check for vacuum lock. If the fuel tank vent is plugged air can't get into the tank to replace the fuel that's drawn out. Remove your fuel cap and see if the truck runs.
I've heard of an excel with problems with the signal from the computer not keeping the fuel pump on, if I recall, that was on a '91 excel. To check yours, you would need to monitor the fuel pressure with a fuel pressure gauge, when the car was running, and still hooked up when the car strops running. If the pressure drops when the car stalls, you know you have a problem in the fuel pump circuit. The owner of that '91 excel had replaced the computer once, and believed he needed another. Don't know if this is your problem, but a good place to start is with the fuel pressure test, especially right after the car stalls. If it turns out not to be fuel related, then probably something in your ignition.
Your problem sounds like you have a bad crankshaft position sensor. You will not get a trouble code (check engine light). This will cause the vehicle to suddenly stall. You cannot change the idle on this vehicle, or any FI modern vehicle contrary to a previous post. It is controlled by the engine management computer by way of an idle air control circuit on the throttle body.
well it could be a number of things vacuum hose, Fuel pump, air duct, distributor. troubleshoot these things and let me know there are a very few more serious problems that are more expensive and more difficult to repair.