The truck starts when I turn the ignition but then immediately dies like it's not getting fuel but the fuel pump is running. Most times when this happens, if I leave the key in the ignition in the on position for a short time, 5-10 mins., the truck will start. This happens with no relation to weather or weather conditions.
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Re: truck starts but won't stay running
You may have a problem with the contacts in the ignition switch (not key part), when you crank the engine a signal is sent to the fuel pump to run, when it starts and you let off the key another set of contacts keeps the pump getting power Through a relay), these are known as crank and run modes.
Dodge 2001 3/4 ton had tiny pin hole on top of transmission pan. Got home from a short drive and the transmission fluid leaked vigourously on the ground. We wanted to get back home, so we have jb welded the hole, put transmission fluid in. The battery was drained because of the light my husband used to help cure the jb weld. We jump started the truck and it would turn over and run but I had to push in on the gas peddle to keep it running. If I take my foot off it dies. I am able to start it back up but I still have to step on gas peddle. What is wrong with our truck?
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The problem of the car dying should be unrelated to the worn key and ignition barrel, as the electrical contacts only depend on the key turning, which it does.
The car may have -
- a vacuum leak somewhere in the intake tract. Look for a split in the big flexible coupling after the air cleaner
- insuffiicient fuel pressure. This might be a blocked filter, pinched fuel line (from a rock), failing pump, or a faulty overpressure release valve in the fuel rail. Get a fuel pressure gauge connected to the fuel rail and see what it reads.
It could still be a fuel problem. The only way to be certain is to put a fuel pressure tester on it. Autozone may rent or loan fuel pressure gauges. Easy to hook up to the shrader valve on the engine fuel rail and test fuel pressure. With key on, pressure must be over 40 psi, 40-44psi is what is called for. If pressure drops below 40 after it starts, then you know it was a fuel problem. Either the fuel filter is clogged, or the pump quits because the oil pressure switch is faulty. That switch is tied into the pump circuit, keeps the pump running after the engine is running.
If fuel pressure stays good, maybe problem is in the ignition system. Have the Ignition Control Module tested, also the crank position sensor.
Seems like a fuel delivery problem.
May be a bad fuel pump, clogged fuel filter or a fuel line problem.
What car make/model? What engine?
When it dies, try to turn ignition off immediately, wait a couple of seconds and turn the key quickly to the crank position (don't wait with the key in ignition-on position so that the fuel pump doesn't try to pump fuel into the fuel lines).
If it hesitates to start or runs significantly shorter before dying, you have pinpointed a problem with the fuel system.
Do you have power to the fuel pump once the key ios released? Try this, start the engine and carefully let the ignition switch back off until the starter is not engaged, does it stay running? If so you need a new ignition starter switch, the switch is located on the top bottom of the steering column under the dash.
It won't die when pulling the relay because it has another power path to the fuel pump through the oil pressure switch . Fuel Pump Electrical Circuits Description and Operation watch this video on fuel pump control , shows chrysler first , ford ,then gm . wait for gm an he explains the oil pressure switch . Plus when it won't start ,don't guess or theorize ! Test what's missing ? check for spark , no spark check ignition system , coil's , ignition module , crank sensor etc... has spark ,do a fuel pressure test etc... don't think computer , when it won't start does the check engine light come on with the key on run not start . If light is lit ,nothing wrong with the cumputer . If want to fix cars you really should take some automotive classes . Test don't guess .Watch some other videos crank no start videos etc...