I just replaced fuel pump filter and relay pump will come on for just a second on 2002 Pontiac Firebird

And shut right off. Does anybody know what it could be

by in Atlanta, GA on February 23, 2014
1 answer 18 comments
ANSWER by on February 23, 2014
Are you trying to start it or just checking operation.
COMMENT by on February 23, 2014
I'm trying to start it every now and pump will kick in for just a second but will not Stay on or build up Ny fuel presure . I'm going to try to replace the crankeshaft Poisoning sensor. If you might have thought of something else let me know Thanks rickyd327@gmail.com
COMMENT by on February 23, 2014
You replaced the filter, the pump, or both. The pump will prime for 3 seconds, if you have a gauge you can verify the pressure, can you cycle the key 3 or 4 times before starting the engine and does it build pressure. Did you install the pump your self or have it done. Don't change the crank sensor until you verify the fuel pressure. If you don't have fuel pressure the crank sensor will Not help you start your car.
COMMENT by on February 23, 2014
I do not have fuel presure it will not build up fuel pump will not stay On long enough to built up. Yes I replaced it my self. I have replaced At least 50 pumps in my time. What else do you have
COMMENT by on February 23, 2014
If you did it right and have no leaks you will have pressure. Your line of doing 50 doesn't mean a thing to me I've done over 500 in my life and anything can happen. Now if you want my help I don't need you to be so sure you are good at what you have done. Right now is the issue. Double check your work something is wrong. Find it. If you jump the relay it might run longer. Think there is always a way to make it work. The hell with the other parts until this issue is fixed.
COMMENT by on February 23, 2014
I jumped the relay and then pump runs fine but injector not opening.
COMMENT by on February 23, 2014
Check your computer grounds, can sensor, don't jump the gun and check injector pulse.
COMMENT by on February 23, 2014
10/4 I'll check it in the morning and let you know Thanks for the help
COMMENT by on February 23, 2014
Going to bed as well.
COMMENT by on February 26, 2014
I'm starting to thank its a computer problem. Soon as you turn the key on the test light at the pump blinks for one second and shuts the pump down can you thank of anything else
COMMENT by on February 26, 2014
It shod stay on steady for about 3 seconds. If it's blinking where at the computer ground leg or at the fp power leg. Did you check the injector pulse before discounting the computer.
COMMENT by on February 26, 2014
Yes. Pump will not stay on
COMMENT by on February 26, 2014
Yes what and where did you put the test light
COMMENT by on February 26, 2014
Something else is shutting the pump down I'm just going to take it down and have a It tested to pinpoint the problem.
COMMENT by on February 26, 2014
Test the PCM connection at the relay, it should be a ground and see if it does the same blinking.
COMMENT by on February 26, 2014
It's not blinking. At the pump when you turn the key soon as you get juice it goes away
COMMENT by on February 26, 2014
Swap relays to a known good one.
COMMENT by on February 26, 2014
Already have
COMMENT by on February 26, 2014
Bad wire or connection between relay and fuel pump.