Pump only runs for a second when key is turned, then shuts off. Turn key on and off 10 times quickly, then try to start. If fuel pump has bad check valve all the fuel in the lines will drain back in the fuel tank whenever engine is turned off
The ECU will turn of the fuel pump if it sees the engine has not started, you can turn the ignition switch on and off or energizer the pump relay to prime the fuel system.
SOURCE: 2001 cavalier barely starts,sometimes runs
Three things.
First, you need to check the MAF sensor for contamination.
Second, check fuel pressure, if you dont have a gauge, autozone and Advance have them on their tool loaner program.
Should see 35-40 psi with key on engine off, cycle key a few times, if it takes a while to build up, replace filter and retest.
Third, possible convertor blockage, easiest check is to remove the 02 sensor and try to start with the hole open, if it runs, then that is it, specs allow for 2-3 lbs of back pressure max. That means if you can hear pressure escaping, it is a problem area.
SOURCE: 93 Mercury topaz does fuel pump have a fuse or relay
there is a fuel pump turn off switch installed on ford. when you lost the tread this was activated. the location will be noted in your owners manual if you have one. usually installed in the rear (trunk area) or front of car drivers side near fuse panel, or passenger side it is a little red button, all you have to do is push it in to reset the switch.
SOURCE: 97 gmc pickup, 5.7 eng, fuel pump not operating,
What you need to do is check you fuel pressure. Go to a local auto parts store and buy a fuel injection pressure tester. The pressure fitting is on the top of the motor its a 3/8 ish sized metal line and has a screw on fitting like a tire valve does. This line comes up from the back of the motor to the right of the distributor and goes down into the intake. Make sure to have a rag handy to catch the fuel seepage. After you connect the pressure tester turn the key on and off three times and read the gage you should have atleast 58 pounds of pressure. If you have 56 pounds it won't run because the fuel injectors are a poppit valve style and need atleast 58 pounds of pressure to operate.
SOURCE: fuel pump runs constantly with key on engine off.
Gauge fuse runs a fuel module that is installed to correct vapor lock. This module is what is running the pump. This module, called the hot fuel module is mounted on the passenger side behind the dash above the blower motor.
Testimonial: "Thank you. So the hot fuel module is probably defective and should be replaced?"
SOURCE: jeep wrangler 2.5 standerd turns
Is it an automatic transmission?
Have you try to start the Wrangler in Neutral.
On automatic transmission there is a neural safety switch.
When it's not send the correct gate position signal (P R N D... ) to the ECU not energize import relay like ASD.
Check for loose linkage to the transmission. + lube linkage with white Lithium grease spray.
Check for loose wiring to the neutral safety switch.
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