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When doing errands (alot of starting and stopping) the car will start hard like it is starving for fuel. I know its fuel injected but only way it starts is by pumping gas pedal. ive already had code checked and changed crankshaft sensor
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assuming the vehicle is a diesel because you say you drained the water separator ? What engine ? What fuel pressure does it have to the injectors ? Do the injectors fire ? Ford 7 3 powerstroke crank no start due to low icp injection pressure... Do you know how to trouble shoot diesel engines ? Your best bet take it to a qualified repair shop .
This is normally a sign of a lean mixture where the fuel injection isn't injecting enough fuel into the engine. It can be from having an inadequate amount of fuel delivered to the engine from the tank, or it can be from the injection system having a malfunction where it isn't injecting enough fuel into the engine. You should start off by checking the trouble codes in the onboard diagnostic system. From there you should check the fuel pressure. Odds are these tests will show a problem and you will know which way to proceed.
I doubt it is the ECM, that doesn't really make any sense to me. I believe your fuel pump is the issue. What do you mean it isn't on under these conditions? When you do a long errand it start and is fine, right? It is heating up during your drive, then won't start up after your short errand. That's why I ask if a longer errand would be fine, and obviously in cold weather, this would be the same. A longer errand lets it cool down.
Does the engine crank and turn over easily when it is hot? If not, it could just be the battery, but I kind of doubt it. Also, you are using premium 92 octane gas right? That care needs it.
Lastly, if you give it some gas before you start and while you start it, you may get it started. I'd hit the pedal a few times before starting and definitely hit the gas when you start it.
The thing you need to do is run a leak down test on the fuel pump overnight, hook up a fuel pump test guage to the fuel injector gas rail test port, run the engine, note the fuel pressure when you shut the engine off, it should not drop more than 5 PSI overnight, if it does you need a new fuel pump. Your car doesn't use a cold start valve, that was used on very early Bosch K-Jetronic fuel injection systems, they where last used in the 80's
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